Patent ID: 12191159

DETAILED DESCRIPTION OF THE EMBODIMENTS

The method, principle and effect of enhancing the stability of N-type semiconductor of the present application are further explained by specific embodiments.

The purchasing sources of chemicals in embodiments and comparative embodiments are as follows.

N-type organic semiconductor (OSC): PTCDI-C8(N,N′-dioctyl-3,4,9,10-perylene dicarboximide): purity: 99%, source: Shanghai Daran Chemical Co., Ltd.; N2200(P(NDI2OD-T2) polymer organic semiconductor): average molecular weight: 30,000-300,000, source: Sigma Aldrich (Shanghai) Trading Co., Ltd.; C60 (fullerene): purity: 99%, source: Shanghai Daran Chemical Co., Ltd.; PTCDA (perylene tetracarboxylic dianhydride): purity: 99%, source: Sigma Aldrich (Shanghai) Trading Co., Ltd.; HAT-CN: purity: 99%, source: Shanghai Daran Chemical Co., Ltd. BDPPV (benzodifurandione-based polyphenylene vinylene: polymer organic semiconductor): purity: 99%, Ningbo Boya Juli New Materials Technology Co., Ltd.; F16CuPc (copper perfluorophthalocyanine): purity: 99%, source: Sigma Aldrich (Shanghai) Trading Co., Ltd.; PTCP-CH2C3F7: purity: 99%, source: Shanghai Daran Chemical Co., Ltd.; DCyNTDA: purity: 99%, source: Shanghai Daran Chemical Co., Ltd. Two-dimensional inorganic semiconductor: MoS2: crystal structure: hexagonal system, transverse dimension: 1-1.5 cm, purity: >99.995%, source: Shanghai PrMat Technology Co., Ltd. Organic high-molecular polymer: PS (polystyrene): purity: 99%, source: Bailingwei Technology Co., Ltd.; PU (polyurethane), average molecular weight: 1000-2,000, source: Anhui Zhongen Chemical Co., Ltd.; PI (polyimide): purity: thermoplastic, average molecular weight: 50,000-80,000, source: Tianjin Tongda Liyang Technology Co., Ltd. Antioxidant: VC (ascorbic acid): source: Meryer (Shanghai) Chemical Technology Co., Ltd.; 3,3′-dihydroxy-4,4′-diketone-β (astaxanthin): purity: 98%, source: Tianjin Hongfeng Weili Technology Development Co., Ltd.; ethylene diamine tetraacetic acid (EDTA): purity: c(EDTA)=0.1 mol/L(0.1N), source: Shanghai Titan Technology Co., Ltd.; amino triacetic acid (NTA): purity: 99%, source: Beijing InnoChem Science and Technology Co., Ltd.; subphosphite ester: purity: 99%, source: Changzhou Jianmao Chemical Co., Ltd.; dithiophosphoric acid-O,O-dimethyl ester: purity: 96%, source: Tianjin Shengbaihao Biotechnology Co., Ltd.; superoxide dismutase (SOD), purity: biochemical purity, source: Beijing Haosai Technology Co., Ltd.; thioredoxin peroxidase (TPX), purity: biochemical purity, source: Nuoshinuoke Laboratory Equipment Distribution Center, Nankai District, Tianjin; 2-(2-hydroxy-5-methylphenyl)benzotriazole: purity: 99%, source: Hubei Meifeng Chemical Co., Ltd.; 2,4-dihydroxy benzophenone: purity: 99%, source: Merck. Other organic molecules: ODTS (octadecyltrichlorosilane): purity: 99%, source: Sigma Aldrich (Shanghai) Trading Co., Ltd.

In the following embodiments and comparative embodiments, Comparative Embodiments 1-10 are used for comparison with the high-stability field effect transistor of the present application, and Embodiments 1-23 are the high-stability field effect transistors of the present application.

Embodiment 1

(1) taking a 500 micron (μm)-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nanometers (nm);(2) spin-coating 5 milligram per milliliter (mg/mL) polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 revolutions per minute (rpm) for 30 seconds (s), and annealing at 60° C. for 30 minutes (min) to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor PTCDI-C8thin film on the surface of PS thin film by evaporation at a rate of 0.05 Angstrom/second (A/s) to a thickness of 20 nm;(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the PTCDI-C8thin film organic field effect transistor; and(5) dissolving ascorbic acid powder in ethanol solution to make the concentration of ascorbic acid 0.03 mole/milliliter (mol/mL); spin-coating ascorbic acid solution on the surface of the pristine PTCDI-C8thin film organic field effect transistor, and annealing at 60° C. for 1 hour (h), and solidifying into a film, thus obtaining an ascorbic acid thin film with a thickness of 100 nm.

Embodiment 2

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing blend thin film of the organic semiconductor PTCDI-C8and ascorbic acid (the mass ratio of organic semiconductor PTCDI-C8to ascorbic acid is 1000:1) on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm; and(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the PTCDI-C8thin film organic field effect transistor.

Embodiment 3

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor PTCDI-C8thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm;(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the PTCDI-C8thin film organic field effect transistor; and(5) dissolving astaxanthin powder in ethanol solution to make the concentration of astaxanthin 0.03 mol/mL; spin-coating astaxanthin solution on the surface of the pristine PTCDI-C8thin film organic field effect transistor, and annealing at 60° C. for 1 h, and solidifying into a film, thus obtaining an antioxidant thin film with a thickness of 100 nm.

The difference between this embodiment and Embodiment 1 is that the astaxanthin thin film is used instead of the ascorbic acid thin film, and all other conditions are the same.

Embodiment 4

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor PTCDI-C8thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm;(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the PTCDI-C8thin film organic field effect transistor; and(5) dissolving ethylene diamine tetraacetic acid powder in ethanol solution to make the concentration of ethylene diamine tetraacetic acid 0.03 mol/mL; spin-coating ethylene diamine tetraacetic acid solution on the surface of the pristine PTCDI-C8thin film organic field effect transistor, and annealing at 60° C. for 1 h, and solidifying into a film, thus obtaining an ethylene diamine tetraacetic acid thin film with a thickness of 100 nm.

The difference between this embodiment and Embodiment 1 is that the ascorbic acid thin film is replaced by ethylene diamine tetraacetic acid thin film, and all other conditions are the same.

Embodiment 5

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor PTCDI-C8thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm;(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the PTCDI-C8thin film organic field effect transistor; and(5) dissolving aminotriacetic acid powder in ethanol solution to make the concentration of aminotriacetic acid 0.03 mol/mL; spin-coating ethylene diamine tetraacetic acid solution on the surface of the pristine PTCDI-C8thin film organic field effect transistor, and annealing at 60° C. for 1 h, and solidifying into a film, thus obtaining an aminotriacetic acid thin film with a thickness of 100 nm.

The difference between this embodiment and Embodiment 1 is that aminotriacetic acid thin film is used instead of ascorbic acid thin film, and all other conditions are the same.

Embodiment 6

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor PTCDI-C8thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm;(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the PTCDI-C8thin film organic field effect transistor; and(5) dissolving subphosphite ester in ethanol solution to make the concentration of subphosphite ester 0.03 mol/mL; spin-coating subphosphite ester solution on the surface of the pristine PTCDI-C8thin film organic field effect transistor, and annealing at 60° C. for 1 h, and solidifying into a film, thus obtaining a subphosphite ester thin film with a thickness of 100 nm.

The difference between this embodiment and Embodiment 1 is that subphosphite ester thin film is used instead of ascorbic acid thin film, and all other conditions are the same.

Embodiment 7

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor PTCDI-C8thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm;(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the PTCDI-C8thin film organic field effect transistor; and(5) dissolving dithiophosphoric acid-O,O-dimethyl ester in ethanol solution to make the concentration of dithiophosphoric acid-O,O-dimethyl ester 0.03 mol/mL; spin-coating dithiophosphoric acid-O,O-dimethyl ester solution on the surface of the pristine PTCDI-C8thin film organic field effect transistor, and annealing at 60° C. for 1 h, and solidifying into a film, thus obtaining a dithiophosphoric acid-O,O-dimethyl ester thin film with a thickness of 100 nm.

The difference between this embodiment and Embodiment 1 is that dithiophosphoric acid-O,O-dimethyl ester thin film is used instead of ascorbic acid thin film, and all other conditions are the same.

Embodiment 8

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor PTCDI-C8thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm;(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the PTCDI-C8thin film organic field effect transistor; and(5) dissolving superoxide dismutase in ethanol solution to make the concentration of superoxide dismutase 0.03 mol/mL; spin-coating superoxide dismutase solution on the surface of the pristine PTCDI-C8thin film organic field effect transistor, and annealing at 60° C. for 1 h, and solidifying into a film, thus obtaining a superoxide dismutase thin film with a thickness of 100 nm.

The difference between this embodiment and Embodiment 1 is that superoxide dismutase thin film is used instead of ascorbic acid thin film, and all other conditions are the same.

Embodiment 9

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor PTCDI-C8thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm;(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the PTCDI-C8thin film organic field effect transistor; and(5) dissolving thioredoxin peroxidase in ethanol solution to make the concentration of thioredoxin peroxidase 0.03 mol/mL; spin-coating thioredoxin peroxidase solution on the surface of the pristine PTCDI-C8thin film organic field effect transistor, and annealing at 60° C. for 1 h, and solidifying into a film, thus obtaining a thioredoxin peroxidase thin film with a thickness of 100 nm.

The difference between this embodiment and Embodiment 1 is that thioredoxin peroxidase thin film is used instead of ascorbic acid thin film, and all other conditions are the same.

Embodiment 10

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor PTCDI-C8thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm;(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the PTCDI-C8thin film organic field effect transistor; and(5) dissolving 2-(2-hydroxy-5-methylphenyl)benzotriazole in ethanol solution to make the concentration of 2-(2-hydroxy-5-methylphenyl)benzotriazole 0.03 mol/mL; spin-coating 2-(2-hydroxy-5-methylphenyl)benzotriazole solution on the surface of the pristine PTCDI-C8thin film organic field effect transistor, and annealing at 60° C. for 1 h, and solidifying into a film, thus obtaining a 2-(2-hydroxy-5-methylphenyl)benzotriazole thin film with a thickness of 100 nm.

The difference between this embodiment and Embodiment 1 is that 2-(2-hydroxy-5-methylphenyl)benzotriazole thin film is used instead of ascorbic acid thin film, and all other conditions are the same.

Embodiment 11

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor PTCDI-C8thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm;(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the PTCDI-C8thin film organic field effect transistor; and(5) dissolving 2,4-dihydroxy benzophenone in ethanol solution to make the concentration of 2,4-dihydroxy benzophenone 0.03 mol/mL; spin-coating 2,4-dihydroxy benzophenone solution on the surface of the pristine PTCDI-C8thin film organic field effect transistor, and annealing at 60° C. for 1 h, and solidifying into a film, thus obtaining a 2,4-dihydroxy benzophenone thin film with a thickness of 100 nm.

The difference between this embodiment and Embodiment 1 is that 2,4-dihydroxy benzophenone thin film is used instead of ascorbic acid thin film, and all other conditions are the same.

Embodiment 12

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor PTCDI-C8thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm;(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the PTCDI-C8thin film organic field effect transistor; and(5) dissolving ascorbic acid powder in ethanol solution to make the concentration of ascorbic acid 0.03 mol/mL; adding polyurethane into ascorbic acid solution and mixing (the mass ratio of polyurethane to solute antioxidant in ascorbic acid solution is 1:100), spin-coating the mixed solution of ascorbic acid and polyurethane on the surface of the pristine PTCDI-C8thin film organic field effect transistor, and annealing at 60° C. for 1 h, and solidifying into a film, thus obtaining a blend thin film of polyurethane and ascorbic acid with a thickness of 100 nm.

The difference between this embodiment and Embodiment 1 is that blend thin film of polyurethane and ascorbic acid is used instead of ascorbic acid thin film, and all other conditions are the same.

Embodiment 13

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor PTCDI-C8thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm;(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the PTCDI-C8thin film organic field effect transistor; and(5) dissolving ascorbic acid powder in ethanol solution to make the concentration of ascorbic acid 0.03 mol/mL; adding polystyrene into ascorbic acid solution and mixing (the mass ratio of polystyrene to solute ascorbic acid in ascorbic acid solution is 1:100), spin-coating the mixed solution of ascorbic acid and polystyrene on the surface of the pristine PTCDI-C8thin film organic field effect transistor, and annealing at 60° C. for 1 h, and solidifying into a film, thus obtaining a blend thin film of polystyrene and ascorbic acid with a thickness of 100 nm.

The difference between this embodiment and Embodiment 12 is that blend thin film of polystyrene and ascorbic acid is used instead of blend thin film of polyurethane and ascorbic acid, and all other conditions are the same.

Embodiment 14

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor PTCDI-C8thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm;(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the PTCDI-C8thin film organic field effect transistor; and(5) dissolving ascorbic acid powder in ethanol solution to make the concentration of ascorbic acid 0.03 mol/mL; adding polyimide into ascorbic acid solution and mixing (the mass ratio of polyimide to solute ascorbic acid in ascorbic acid solution is 1:100), spin-coating the mixed solution of ascorbic acid and polyimide on the surface of the pristine PTCDI-C8thin film organic field effect transistor, and annealing at 60° C. for 1 h, and solidifying into a film, thus obtaining a blend thin film of polyimide and ascorbic acid with a thickness of 100 nm.

The difference between this embodiment and Embodiment 12 is that blend thin film of polyimide and ascorbic acid is used instead of blend thin film of polyurethane and ascorbic acid, and all other conditions are the same.

Embodiment 15

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) carrying out oxygen plasma treatment on a silicon wafer containing a silicon dioxide layer, for 5 min at a power of 50 watts (W); placing the treated silicon wafer in a drying oven with vacuum pressure of 0.1 MPa and temperature set at 120° C. for ODTS modification for 120 min, ultrasonically washing the modified silicon wafer in acetone, chloroform and ethanol solution for 15 min in sequence; placing in a drying oven with the temperature set at 110° C. for drying and annealing for 10 min, and cooling to room temperature;(3) spin-coating the ODTS-modified silicon wafer with 5 mg/mL of N2200 chloroform solution by spin-coating at a spin-coating speed of 1000 rpm for 30 s to obtain the N2200 film with a thickness of 50 nm, placing the N2200 film on a hot stage with a temperature set at 150° C., annealing for 2 h, and cooling to room temperature;(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the N2200 film organic field effect transistor; and(5) dissolving ascorbic acid powder in ethanol solution to make the concentration of ascorbic acid 0.03 mol/mL; adding polyurethane into ascorbic acid solution and mixing (the mass ratio of polyurethane to solute ascorbic acid in ascorbic acid solution is 1:100), spin-coating the mixed solution of ascorbic acid and polyurethane on the surface of the pristine N2200 film organic field effect transistor, and annealing at 60° C. for 1 h, and solidifying into a film, thus obtaining a blend thin film of polyurethane and ascorbic acid with a thickness of 100 nm.

The difference between this embodiment and Embodiment 12 is that the dielectric layer is changed to ODTS, and the organic semiconductor N2200 film is prepared by spin coating, and other conditions are all the same.

Embodiment 16

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor C60 thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 100 nm;(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the C60 thin film organic field effect transistor; and(5) dissolving ascorbic acid powder in ethanol solution to make the concentration of ascorbic acid 0.03 mol/mL; adding polyurethane into ascorbic acid solution and mixing (the mass ratio of polyurethane to solute ascorbic acid in ascorbic acid solution is 1:100), spin-coating the mixed solution of ascorbic acid and polyurethane on the surface of the pristine C60 thin film organic field effect transistor, and annealing at 60° C. for 1 h, and solidifying into a film, thus obtaining a blend thin film of polyurethane and ascorbic acid with a thickness of 100 nm.

The difference between this embodiment and Embodiment 12 is that the organic semiconductor is changed to C60 thin film, and all other conditions are the same.

Embodiment 17

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor PTCDA thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm;(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the PTCDA thin film organic field effect transistor; and(5) dissolving ascorbic acid powder in ethanol solution to make the concentration of ascorbic acid 0.03 mol/mL; adding polyurethane into antioxidant solution and mixing (the mass ratio of polyurethane to solute antioxidant in antioxidant solution is 1:100), spin-coating the mixed solution of ascorbic acid and polyurethane on the surface of the pristine PTCDA thin film organic field effect transistor, and annealing at 60° C. for 1 h, and solidifying into a film, thus obtaining a blend thin film of polyurethane and ascorbic acid with a thickness of 100 nm.

The difference between this embodiment and Embodiment 12 is that the organic semiconductor is changed to PTCDA thin film, and all other conditions are the same.

Embodiment 18

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor HAT-CN thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm;(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the HAT-CN thin film organic field effect transistor; and(5) dissolving ascorbic acid powder in ethanol solution to make the concentration of ascorbic acid 0.03 mol/mL; adding polyurethane into ascorbic acid solution and mixing (the mass ratio of polyurethane to solute ascorbic acid in ascorbic acid solution is 1:100), spin-coating the mixed solution of ascorbic acid and polyurethane on the surface of the pristine HAT-CN thin film organic field effect transistor, and annealing at 60° C. for 1 h, and solidifying into a film, thus obtaining a blend thin film of polyurethane and ascorbic acid with a thickness of 100 nm.

The difference between this embodiment and Embodiment 12 is that the organic semiconductor is changed to HAT-CN thin film, and all other conditions are the same.

Embodiment 19

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 3 mg/mL BDPPV orthodichlorobenzene solution on the silicon wafer by spin-coating at a rotating speed of 2,000 rpm for 30 s to obtain BDPPV thin film with a thickness of 50 nm, placing the BDPPV thin film on a hot stage with a temperature set at 100° C., annealing for 15 h, and cooling to room temperature;(3) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the BDPPV thin film organic field effect transistor; and(4) dissolving ascorbic acid powder in ethanol solution to make the concentration of ascorbic acid 0.03 mol/mL; adding polyurethane into ascorbic acid solution and mixing (the mass ratio of polyurethane to solute ascorbic acid in ascorbic acid solution is 1:100), spin-coating the mixed solution of ascorbic acid and polyurethane on the surface of the pristine BDPPV thin film organic field effect transistor, and annealing at 60° C. for 1 h, and solidifying into a film, thus obtaining a blend thin film of polyurethane and ascorbic acid with a thickness of 100 nm.

The difference between this embodiment and Embodiment 12 is that the dielectric layer is changed and the organic semiconductor BDPPV thin film is prepared by spin coating, and other conditions are all the same.

Embodiment 20

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor F16CuPc thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm;(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the F16CuPc thin film organic field effect transistor; and(5) dissolving ascorbic acid powder in ethanol solution to make the concentration of ascorbic acid 0.03 mol/mL; adding polyurethane into ascorbic acid solution and mixing (the mass ratio of polyurethane to solute ascorbic acid in ascorbic acid solution is 1:10), spin-coating the mixed solution of ascorbic acid and polyurethane on the surface of the pristine F16CuPc thin film organic field effect transistor, and annealing at 60° C. for 1 h, and solidifying into a film, thus obtaining a blend thin film of polyurethane and ascorbic acid with a thickness of 100 nm.

The difference between this embodiment and Embodiment 12 is that the organic semiconductor is replaced by F16CuPc thin film, and all other conditions are the same.

Embodiment 21

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor PTCP-CH2C3F7thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm;(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the PTCP-CH2C3F7thin film organic field effect transistor; and(5) dissolving ascorbic acid powder in ethanol solution to make the concentration of antioxidant 0.03 mol/mL; adding polyurethane into ascorbic acid solution and mixing (the mass ratio of polyurethane to solute antioxidant in antioxidant solution is 1:100), spin-coating the mixed solution of ascorbic acid and polyurethane on the surface of the pristine PTCP-CH2C3F7thin film organic field effect transistor, and annealing at 60° C. for 1 h, and solidifying into a film, thus obtaining a blend thin film of polyurethane and ascorbic acid with a thickness of 100 nm.

The difference between this embodiment and Embodiment 12 is that the organic semiconductor is replaced by PTCP-CH2C3F7thin film, and all other conditions are the same.

Embodiment 22

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor DCyNTDA thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm;(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the DCyNTDA thin film organic field effect transistor; and(5) dissolving ascorbic acid powder in ethanol solution to make the concentration of ascorbic acid 0.03 mol/mL; adding polyurethane into antioxidant solution and mixing (the mass ratio of polyurethane to solute antioxidant in ascorbic acid solution is 1:100), spin-coating the mixed solution of ascorbic acid and polyurethane on the surface of the pristine DCyNTDA thin film organic field effect transistor, and annealing at 60° C. for 1 h, and solidifying into a film, thus obtaining a blend thin film of polyurethane and ascorbic acid with a thickness of 100 nm.

The difference between this embodiment and Embodiment 12 is that the organic semiconductor is replaced by DCyNTDA thin film, and all other conditions are the same.

Embodiment 23

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) carrying out oxygen plasma treatment on a silicon wafer containing a silicon dioxide layer, for 5 min at a power of 50 W; placing the treated silicon wafer in a drying oven with vacuum pressure of 0.1 MPa and temperature set at 120° C. for ODTS modification for 120 min, ultrasonically washing the modified silicon wafer in acetone, chloroform and ethanol solution for 15 min in sequence; placing in a drying oven with the temperature set at 110° C. for drying and annealing for 10 min, and cooling to room temperature;(3) transferring single-layer MOS2to the ODTS-modified silicon wafer by stripping method, where the thickness of MOS2layer is 0.7 nm;(4) attaching a silver source and a drain electrode with a thickness of 20 nm on a single-layer MoS2by the transfer gold film method to obtain a single-crystal MoS2field effect transistor; and(5) dissolving ascorbic acid powder in ethanol solution to make the concentration of antioxidant 0.03 mol/mL; adding polyurethane into ascorbic acid solution and mixing (the mass ratio of polyurethane to solute antioxidant in antioxidant solution is 1:100), spin-coating the mixed solution of ascorbic acid and polyurethane on the surface of the single-crystal MoS2field effect transistor, and forming into a film at room temperature, thus obtaining a blend thin film of polyurethane and ascorbic acid with a thickness of 100 nm.

Comparative Embodiment 1

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor PTCDI-C8thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm; and(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the PTCDI-C8thin film organic field effect transistor.

The difference between Comparative embodiment 1 and Embodiment 1 is that the ascorbic acid thin film is not spin-coated on the surface of PTCDI-C8thin film, and all other conditions are the same; the difference from Embodiment 2 is that the semiconductor layer is not doped with ascorbic acid molecules, and all other conditions are the same.

Comparative Embodiment 2

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) carrying out oxygen plasma treatment on a silicon wafer containing a silicon dioxide layer, for 5 min at a power of 50 W; placing the treated silicon wafer in a drying oven with vacuum pressure of 0.1 MPa and temperature set at 120° C. for ODTS modification for 120 min, ultrasonically washing the modified silicon wafer in acetone, chloroform and ethanol solution for 15 min in sequence; placing in a drying oven with the temperature set at 110° C. for drying and annealing for 10 min, and cooling to room temperature;(3) spin-coating the ODTS-modified silicon wafer with 5 mg/mL of N2200 chloroform solution by spin-coating at a spin-coating speed of 1000 rpm for 30 s to obtain the N2200 film with a thickness of 50 nm, placing the N2200 film on a hot stage with a temperature set at 150° C., annealing for 2 h, and cooling to room temperature; and(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the N2200 film organic field effect transistor.

Comparative Embodiment 3

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor C60 thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 100 nm; and(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the C60 thin film organic field effect transistor.

Comparative Embodiment 4

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor PTCDA thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm; and(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the PTCDA thin film organic field effect transistor.

Comparative Embodiment 5

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor HAT-CN thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm; and(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the HAT-CN thin film organic field effect transistor.

Comparative Embodiment 6

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 3 mg/mL BDPPV orthodichlorobenzene solution on the silicon wafer by spin-coating at a rotating speed of 2,000 rpm for 30 s to obtain BDPPV thin film with a thickness of 50 nm, placing the BDPPV thin film on a hot stage with a temperature set at 100° C., annealing for 15 h, and cooling to room temperature;(3) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the BDPPV thin film organic field effect transistor.

Comparative embodiment 7(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor F16CuPc thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm; and(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the F16CuPc thin film organic field effect transistor.

Comparative Embodiment 8

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor PTCP-CH2C3F7thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm; and(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the PTCP-CH2C3F7thin film organic field effect transistor.

Comparative Embodiment 9

(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) spin-coating 5 mg/mL polystyrene chloroform solution on the surface of the dielectric layer at a rotating speed of 2,000 rpm for 30 s, and annealing at 60° C. for 30 min to obtain a PS thin film with a thickness of 25 nm;(3) depositing the organic semiconductor DCyNTDA thin film on the surface of PS thin film by evaporation at a rate of 0.05 Å/s to a thickness of 20 nm; and(4) depositing a silver source and a drain electrode with a thickness of 20 nm on the organic semiconductor layer by evaporation at a rate of 0.1 Å/s to obtain the DCyNTDA thin film organic field effect transistor.

Comparative embodiment 10(1) taking a 500 μm-thick heavily doped silicon wafer as a grid electrode and silicon dioxide naturally oxidized on the surface of the heavily doped silicon wafer as a dielectric layer with a thickness of 300 nm;(2) carrying out oxygen plasma treatment on a silicon wafer containing a silicon dioxide layer, for 5 min at a power of 50 W; placing the treated silicon wafer in a drying oven with vacuum pressure of 0.1 MPa and temperature set at 120° C. for ODTS modification for 120 min, ultrasonically washing the modified silicon wafer in acetone, chloroform and ethanol solution for 15 min in sequence; placing in a drying oven with the temperature set at 110° C. for drying and annealing for 10 min, and cooling to room temperature;(3) transferring single-layer MOS2to the ODTS-modified silicon wafer by stripping method, where the thickness of MOS2layer is 0.7 nm; and(4) attaching a silver source and a drain electrode with a thickness of 20 nm on a single-layer MoS2by the transfer gold film method to obtain a single-crystal MoS2field effect transistor.
1. Comparison of Structural Schematic Diagram

The structural schematic diagram of the pristine PTCDI-C8thin film organic field effect transistor prepared in Comparative embodiment 1 is shown inFIG.1A, and the structural schematic diagram of the PTCDI-C8thin film organic field effect transistor with ascorbic acid thin film on surface prepared in Embodiment 1 is shown inFIG.1B, the organic field effect transistor doped with ascorbic acid molecules in the PTCDI-C8semiconductor layer prepared in embodiment 2 under environmental conditions is shown inFIG.1C, and a microscopic process of antioxidant scavenging oxygen and related species in organic semiconductors is shown inFIG.1D. It can be observed fromFIG.1A-FIG.1Dthat through constructing the antioxidant layer on the surface of the N-type semiconductor device or constructing the blend thin film of antioxidant and the N-type semiconductor molecules, the antioxidant may not only remove the oxygen and related species that have been added into the N-type semiconductor, and eliminate the related trap state in the forbidden band, but also prevent the N-type semiconductor from further degrading, so that the electrical properties such as the mobility of the N-type semiconductor device are improved, and the operation stability and long-term storage stability are improved.

2. Electrical Characteristic Curves

The electrical properties of the pristine PTCDI-C8thin film organic field effect transistor prepared in Comparative embodiment 1, the PTCDI-C8thin film organic field effect transistor with ascorbic acid thin film constructed on surface prepared in Embodiment 1 and the PTCDI-C8thin film organic field effect transistor doped with ascorbic acid molecules prepared in embodiment 2 are tested under environmental conditions. The electrical characteristic curves of the three organic field effect transistors are shown inFIG.2A-FIG.2D, whereFIG.2Ais transfer curves of the pristine PTCDI-C8thin film organic field effect transistor prepared in Comparative embodiment 1, PTCDI-C8thin film organic field effect transistor treated by adding ascorbic acid thin film prepared in Embodiment 1 and PTCDI-C8thin film organic field effect transistor doped with ascorbic acid molecules in the semiconductor layer prepared in Embodiment 2,FIG.2Bis an output curve of Embodiment 2,FIG.2Cis an output curve of Embodiment 1, andFIG.2Dis an output curve of Comparative embodiment 1. As can be seen fromFIG.2A-FIG.2D, the initial electrical signal of the untreated pristine PTCDI-C8thin film organic field effect transistor made in Comparative embodiment 1 is not high, and the initial electrical signals of the PTCDI-C8thin film organic field effect transistor with ascorbic acid thin film constructed on surface prepared in Embodiment 1 and the PTCDI-C8thin film organic field effect transistor doped with ascorbic acid molecules prepared in Embodiment 2 are obviously improved compared with the untreated device.

3. Stability of Electrochemical Parameters

The time-varying property parameters of the pristine PTCDI-C8thin film organic field effect transistor prepared in Comparative embodiment 1, the PTCDI-C8thin film organic field effect transistor with ascorbic acid thin film constructed on surface prepared in Embodiment 1 and the PTCDI-C8thin film organic field effect transistor doped with ascorbic acid molecules prepared in Embodiment 2 are tested under environmental conditions. Results are shown inFIG.3A-FIG.3C, whereFIG.3Ashows carrier mobility,FIG.3Bis Ion/IoffandFIG.3Cis the threshold voltage (Vth). As can be seen fromFIG.3A-FIG.3C, after the untreated pristine PTCDI-C8thin film organic field effect transistor prepared in Comparative embodiment 1 is stored for a long time, all the electrical parameters are obviously are decreased, while the PTCDI-C8thin film organic field effect transistor with ascorbic acid thin film on surface prepared in Embodiment 1 and the PTCDI-C8thin film organic field effect transistor doped with ascorbic acid molecules prepared in Embodiment 2 are very stable after long-term storage.

4. Operating Stability and Switching Cycle Stability

The switching cycle characteristics of the pristine PTCDI-C8thin film organic field effect transistor prepared in Comparative embodiment 1, the PTCDI-C8thin film organic field effect transistor with ascorbic acid thin film constructed on surface prepared in Embodiment 1 and the PTCDI-C8thin film organic field effect transistor doped with ascorbic acid molecules prepared in Embodiment 2 are tested under environmental conditions. The switching cycle curves of the three transistors are shown inFIG.4A-FIG.4C, and the illustrations are the amplification curves at the beginning, middle and end of the cycle test, whereFIG.4Ais Comparative embodiment 1,FIG.4Bis Embodiment 1 andFIG.4Cis Embodiment 2. As can be seen fromFIG.4A-FIG.4C, the untreated pristine PTCDI-C8thin film organic field effect transistor prepared in Comparative embodiment 1 has low operating stability and poor switching cycle stability, so it cannot be applied in practice. The operating stability and switching cycle stability of the PTCDI-C8thin film organic field effect transistor with ascorbic acid thin film constructed on surface prepared in Embodiment 1 and the PTCDI-C8thin film organic field effect transistor doped with ascorbic acid molecules prepared in Embodiment 2 are obviously improved, and the stability of Embodiment 2 is consistent with that of Embodiment 1.

5. Universality of Antioxidant Molecules to Improve the Property and Stability of N-Type Semiconductor Devices

The time-varying electrical properties and property parameters of Embodiments 3-11 and Comparative embodiment 1 under environmental conditions are tested, and the results are shown inFIG.5A-FIG.5R.FIG.5Ashows transfer curves of untreated (Comparative embodiment 2) PTCDI-C8thin film organic field effect transistor and PTCDI-C8thin film organic field effect transistor treated with astaxanthin (Embodiment 3).FIG.5Bshows transfer curves of untreated (Comparative embodiment 2) PTCDI-C8thin film organic field effect transistor and PTCDI-C8thin film organic field effect transistor treated with ethylene diamine tetraacetic acid (Embodiment 4).FIG.5Cshows transfer curves of untreated (Comparative embodiment 2) PTCDI-C8thin film organic field effect transistor and PTCDI-C8thin film organic field effect transistor treated with aminotriacetic acid (Embodiment 5).FIG.5Gshows transfer curves of untreated (Comparative embodiment 2) PTCDI-C8thin film organic field effect transistor and PTCDI-C8thin film organic field effect transistor treated with subphosphite ester (Embodiment 6).FIG.5Hshows transfer curves of untreated (Comparative embodiment 2) PTCDI-C8thin film organic field effect transistor and PTCDI-C8thin film organic field effect transistor treated with dithiophosphoric acid-O,O-dimethyl ester (Embodiment 7).FIG.5Ishows transfer curves of untreated (Comparative embodiment 2) PTCDI-C8thin film organic field effect transistor and PTCDI-C8thin film organic field effect transistor treated with superoxide dismutase (Embodiment 8).FIG.5Mshows transfer curves of untreated (Comparative embodiment 2) PTCDI-C8thin film organic field effect transistor and PTCDI-C8thin film organic field effect transistor treated with thioredoxin peroxidase (Embodiment 9).FIG.5Nshows transfer curves of untreated (Comparative embodiment 2) PTCDI-C8thin film organic field effect transistor and PTCDI-C8thin film organic field effect transistor treated with 2-(2-hydroxy-5-methylphenyl)benzotriazole (Embodiment 10).FIG.5Oshows transfer curves of untreated (Comparative embodiment 2) PTCDI-C8thin film organic field effect transistor and PTCDI-C8thin film organic field effect transistor treated with 2,4-dihydroxy benzophenone (Embodiment 11).FIG.5Dshows time-varying property parameters of untreated PTCDI-C8thin film organic field effect transistor and PTCDI-C8thin film organic field effect transistor treated with astaxanthin under air condition.FIG.5Eshows time-varying property parameters of untreated PTCDI-C8thin film organic field effect transistor and PTCDI-C8thin film organic field effect transistor treated with EDTA under air condition.FIG.5Fshows time-varying property parameters of untreated PTCDI-C8thin film organic field effect transistor and PTCDI-C8thin film organic field effect transistor treated with aminotriacetic acid under air condition.FIG.5Jshows time-varying property parameters of untreated PTCDI-C8thin film organic field effect transistor and PTCDI-C8thin film organic field effect transistor treated with subphosphite ester under air condition.FIG.5Kshows time-varying property parameters of untreated PTCDI-C8thin film organic field effect transistor and PTCDI-C8thin film organic field effect transistor treated with dithiophosphoric acid-O,O-dimethyl ester under air condition.FIG.5Lshows time-varying property parameters of untreated PTCDI-C8thin film organic field effect transistor and PTCDI-C8thin film organic field effect transistor treated with superoxide dismutase under air condition. FIG.5P shows time-varying property parameters of untreated PTCDI-C8thin film organic field effect transistor and PTCDI-C8thin film organic field effect transistor treated with thioredoxin peroxidase under air condition.FIG.5Qshows time-varying property parameters of untreated PTCDI-C8thin film organic field effect transistor and PTCDI-C8thin film organic field effect transistor treated with 2-(2-hydroxy-5-methylphenyl) under air condition.FIG.5Rshows time-varying property parameters of untreated PTCDI-C8thin film organic field effect transistor and PTCDI-C8thin film organic field effect transistor treated with 2,4-dihydroxy benzophenone under air condition. As can be seen fromFIG.5A-FIG.5R, the initial electrical properties of the organic field effect transistors treated with antioxidant are obviously stronger than those of the corresponding pristine devices not treated with antioxidant, and the organic field effect transistors treated with antioxidant remain stable for a long time.

6. The Influence of Polyurethane on the Morphology of Ascorbic Acid Thin Film

The morphological changes of pure ascorbic acid thin film and blend thin film of ascorbic acid and polyurethane are shown inFIG.6A-FIG.6E, whereFIG.6Ais an optical image of a pristine pure ascorbic acid thin film,FIG.6Bis an optical image of a pure ascorbic acid thin film stored in atmospheric environment for 2 weeks,FIG.6Cis an optical image of a pristine blend thin film of ascorbic acid and polyurethane,FIG.6Dis an optical image of the blend thin film of ascorbic acid and polyurethane stored in atmospheric environment for 2 weeks, andFIG.6Eis an X-ray diffraction patterns of ascorbic acid powder, ascorbic acid thin film, and blend thin film of ascorbic acid and polyurethane. As can be seen fromFIG.6A-FIG.6E, obviously, the antioxidant thin film without adding polyurethane crystallizes obviously after 2 weeks; due to the addition of polyurethane, the blend thin film of ascorbic acid and polyurethane is stored in the atmospheric environment for 2 weeks, and the film is still uniform through optical images. In addition,FIG.6Eshows the X-ray diffraction patterns of ascorbic acid powder, ascorbic acid thin film and the blend thin film of ascorbic acid and polyurethane. With the addition of polyurethane, there is no peak of ascorbic acid in the ascorbic acid thin film, which proves that the blend thin film of ascorbic acid and polyurethane does not crystallize.

7. The Universality of Polymer

The time-varying electrical properties and property parameters of Embodiments 13-15 and Comparative embodiment 1 are tested under environmental conditions. Results are shown inFIG.7A-FIG.7E.FIG.7Ais the transfer curves of untreated (Comparative embodiment 1) PTCDI-C8thin film organic field effect transistor and PTCDI-C8thin film organic field effect transistor treated with blend thin film of ascorbic acid and polyurethane (Embodiment 12) under environmental conditions.FIG.7Bis the transfer curves of untreated (Comparative embodiment 1) PTCDI-C8thin film organic field effect transistor and PTCDI-C8thin film organic field effect transistor treated with blend thin film of ascorbic acid and polystyrene (Embodiment 13) under environmental conditions.FIG.7Cis the transfer curves of untreated (Comparative embodiment 1) PTCDI-C8thin film organic field effect transistor and PTCDI-C8thin film organic field effect transistor treated with blend thin film of ascorbic acid and polyimide (Embodiment 14) under environmental conditions.FIG.7Dshows time-varying property parameters of PTCDI-C8thin film organic field effect transistor treated with blend thin film of ascorbic acid and polyurethane under air condition.FIG.7Eshows time-varying property parameters of PTCDI-C8thin film organic field effect transistor treated with blend thin film of ascorbic acid and polystyrene under air condition.FIG.7Fshows time-varying property parameters of PTCDI-C8thin film organic field effect transistor treated with blend thin film of ascorbic acid and polyimide under air condition. As can be seen fromFIG.7A-FIG.7E.7, the initial electrical properties of the organic field effect transistor treated with ascorbic acid and polymer are obviously stronger than those of the corresponding pristine device without antioxidant and polymer treatment, and remain stable for a long time.

8. The Molecular Universality of Ascorbic Acid in Scavenging Oxygen in Semiconductors

The time-varying electrical properties and property parameters of Embodiments 15-23 and Comparative embodiments 2-10 are tested under environmental conditions, and the results are shown inFIG.8A-FIG.8R.FIG.8Ashows transfer curves of untreated (Comparative embodiment 2) N2200 thin film field effect transistor (field effect transistor) and N2200 film field effect transistor treated with blend thin film of ascorbic acid and polyurethane (Embodiment 15).FIG.8Bshows transfer curves of untreated (Comparative embodiment 3) C60 thin film field effect transistor and C60 thin film field effect transistor treated with blend thin film of ascorbic acid and polyurethane (Embodiment 16).FIG.8Cshows transfer curves of untreated (Comparative embodiment 3) PTCDA thin film field effect transistor and PTCDA thin film field effect transistor treated with blend thin film of ascorbic acid and polyurethane (Embodiment 17).FIG.8Gshows transfer curves of untreated (Comparative embodiment 5) HAT-CN thin film field effect transistor and HAT-CN field effect transistor treated with blend thin film of ascorbic acid and polyurethane (Embodiment 18).FIG.8Hshows transfer curves of untreated (Comparative embodiment 6) BDPPV field effect transistor and BDPPV field effect transistor treated with blend thin film of ascorbic acid and polyurethane (Embodiment 19).FIG.8Ishows transfer curves of untreated (Comparative embodiment 7) F16CuPc thin film field effect transistor and F16CuPc thin film field effect transistor treated with blend thin film of ascorbic acid and polyurethane (Embodiment 20).FIG.8Mshows transfer curves of untreated (Comparative embodiment 8) PTCP-CH2C3F7thin film field effect transistor and PTCP-CH2C3F7thin film field effect transistor treated with blend thin film of ascorbic acid and polyurethane (Embodiment 21).FIG.8Nshows transfer curves of untreated (Comparative embodiment 9) DCyNTDA thin film field effect transistor and DCyNTDA thin film field effect transistor treated with blend thin film of ascorbic acid and polyurethane (Embodiment 22).FIG.8Oshows transfer curves of untreated (Comparative embodiment 10) MoS2film field effect transistor and MoS2film field effect transistor treated with blend thin film of ascorbic acid and polyurethane (Embodiment 23).FIG.8Dshows time-varying property parameters (μ/μ0, μ and Vt) of untreated N2200 film field effect transistor and N2200 film field effect transistor treated with blend thin film of ascorbic acid and polyurethane under air condition.FIG.8Eshows time-varying property parameters (μ/μ0, μ and Vt) of untreated C60 thin film field effect transistor and C60 thin film field effect transistor treated with blend thin film of ascorbic acid and polyurethane under air condition.FIG.8Fshows time-varying property parameters (μ/μ0, μ and Vt) of untreated PTCDA thin film field effect transistor and PTCDA thin film field effect transistor treated with blend thin film of ascorbic acid and polyurethane under air condition.FIG.8Jshows time-varying property parameters (μ/μ0, μ and Vt) of untreated HAT-CN thin film field effect transistor and HAT-CN thin film field effect transistor treated with blend thin film of ascorbic acid and polyurethane under air condition.FIG.8Kshows time-varying property parameters (μ/μ0, μ and Vt) of untreated BDPPV field effect transistor and BDPPV field effect transistor treated with blend thin film of ascorbic acid and polyurethane under air condition.FIG.8Lshows time-varying property parameters (μ/μ0, μ and Vt) of untreated F16CuPc thin film field effect transistor and F16CuPc thin film field effect transistor treated with blend thin film of ascorbic acid and polyurethane under air condition.FIG.8Pshows time-varying property parameters (μ/μ0, μ and Vt) of untreated PTCP-CH2C3F7thin film field effect transistor and PTCP-CH2C3F7thin film field effect transistor treated with blend thin film of ascorbic acid and polyurethane under air condition.FIG.8Qshows time-varying property parameters (μ/μ0, μ and Vt) of untreated DCyNTDA thin film field effect transistor and DCyNTDA thin film field effect transistor treated with blend thin film of ascorbic acid and polyurethane under air condition.FIG.8Rshows time-varying property parameters (μ/μ0, μ and Vt) of untreated MoS2film field effect transistor and MoS2film field effect transistor treated with blend thin film of ascorbic acid and polyurethane under air condition. It can be seen fromFIG.8A-FIG.8R, initial electrical properties of N2200 film field effect transistor, C60 thin film field effect transistor, PTCDA thin film field effect transistor, HAT-CN thin film field effect transistor, F16CuPc thin film field effect transistor, PTCP-CH2C3F7thin film field effect transistor, DCyNTDA thin film field effect transistor and MoS2film field effect transistor treated with blend thin film of ascorbic acid and polyurethane are obviously stronger than those of the corresponding pristine device without antioxidant treatment, and remain stable for a long time.

9. Effect of Ascorbic Acid on Photooxidation of Semiconductor

The ultraviolet absorption spectrum of PTCDI-C8solution with or without ascorbic acid powder is tested under continuous illumination. The ultraviolet absorption spectrum is shown inFIG.9A-FIG.9C.FIG.9Ais pure, where with the illumination to PTCDI-C8, the oxidation of PTCDI-C8is accelerated by illumination because of the generation of oxygen and the existence of other species, and its absorption peak intensity is gradually weakened.FIG.9Bis PTCDI-C8solution with ascorbic acid powder, and the absorption peak intensity of PTCDI-C8remains unchanged with illumination, which proves that ascorbic acid eliminates oxygen and other species, and inhibits its photooxidation process. In addition,FIG.9Ccompares the relationship between normalized absorption intensity and irradiation time when the wavelength of PTCDI-C8solution without and with ascorbic acid powder is 518 nm, which proves once again that the addition of ascorbic acid powder may inhibit the photooxidation (photobleaching) process of PTCDI-C8.