Prebaking process for facilitating removal of positive photoresist with stripping solutions

Abstract: A process for stripping a positive organic photoresist from a substrate, which comprises prebaking the positive organic photoresist at a temperature in the range of from 150 to 220°C for a period of time of from 15 minutes to 30 minutes, then contacting the positive organic photoresist with a liquid photoresist stripper for the positive organic photoresist for a time sufficient to remove the positive organic photoresist from the substrate.

Description: This invention relates to a process for removing ion implanted positive photoresist and other difficult to remove polymeric layers from substrates. More particularly, it relates to a novel prebaking process for making positive photoresist easier to remove with stripping solutions. Stripping compositions utilizing various amine compounds for the removal of positive photoresist from semiconductor wafers having insulating and/or conductive patterns defined on their surfaces using the photoresist during the manufacture of integrated circuits are known in the art. For example, Posistrip 830, available from EKC Technology, Hayward, CA 94540, is the most aggressive commercially available stripper for positive photoresist. The principal active ingredient of Posistrip 830 is 2-(2-aminoethoxy) ethanol. Another material that is used for this purpose is N-methyl pyrrolidone. In very large scale integration (VLSI) fabrication, ion implantation is used to add dopant atoms to silicon or other semiconductor material to change the conductivity of the semiconductor material. Examples of such dopants include donor atoms, or n-type dopants, such as phosphorus, arsenic or antimony and acceptor atoms, or p-type dopants, such as boron, aluminum or gallium. The superiority of ion implantation over diffusion doping methods for this purpose has caused it to replace diffusion doping in an increasing number of applications. To restrict the ionic species from being implanted into unwanted substrate regions, an appropriate masking layer needs to be present on the wafer surface, with openings in the areas where implantation is desired. Many materials are used for such masking purposes in integrated circuit fabrication, including photoresist, SiO 2 , Si 3 N 4 , polysilicon, metal films, and polyimide. A thin layer of SiO 2 of, for example, 200-300 Angstroms thickness is usually added in the openings to provide a protective screen against contamination by metals or other impurities during implant. Higher energy implanters are needed, especially for arsenic implants, when this is done as the implanting beam must first penetrate the screening layer in the openings, during which time it loses energy, before arriving at the semiconductor substrate. Modern VLSI processes employ implant doses ranging from about 10 11 to 10 16 ions/cm 2 . After heavy doses, a photoresist masking layer may become difficult to remove. As a result of such removal difficulties, the most common method for removing ion implanted photoresist is an oxygen plasma process, which is time consuming and expensive. Commercially available photoresist stripping solutions, including the Posistrip 830 solution and the N-methyl pyrrolidone mentioned above, have not proven to be suitable for stripping such ion implanted photoresist, especially at heavy dosing levels. The state of the ion implantation processing art is discussed in Stanley Wolf and Richard N. Tauber, Silicon Processing for the VLSI Era , Chapter 9, "Ion Implantation for VLSI", pp. 280-330, including the difficulty of stripping ion implanted photoresist. EP-A-0 219 789 relates to solvent systems, based on water-soluble amino derivatives and propylene glycol compounds, that are useful for removing photoresists. EP-A-0 145 973 relates to stripping compositions which are useful for removing positive photoresists. US 4,617,251 relates to a stripping composition for removing organic polymeric materials from substrates. Accordingly, it is an object of this invention to provide an improved process for removing an ion-implanted positive photoresist with a stripping liquid which makes the positive photoresist easier to remove. In a first aspect, the present invention provides a process for stripping an ion-implanted positive organic photoresist from a substrate, which comprises prebaking the ion-implanted positive organic photoresist at a temperature in the range of from 150 to 220°C for a period of time of from 15 minutes to 30 minutes, then contacting the ion-implanted positive organic photoresist with a liquid photoresist stripper for a time sufficient to remove the ion-implanted positive organic photoresist from the substrate. In a second aspect, the present invention provides an integrated circuit fabrication process, which comprises forming a positive organic photoresist layer on a semiconductor wafer, defining an opening in the positive organic photoresist layer corresponding to a desired doping area in the semiconductor wafer, doping the semiconductor wafer by ion implanting a dopant impurity into the semiconductor wafer through the opening in the positive organic photoresist layer, prebaking the ion-implanted positive organic photoresist layer at a temperature in the range of from 150 to 220°C for a period of time of from 15 minutes to 30 minutes to make the ion-implanted positive organic photoresist layer more readily removable with a stripping liquid and contacting the ion-implanted positive organic photoresist layer with a liquid photoresist stripper for a time sufficient to remove the ion-implanted positive organic photoresist layer from the semiconductor wafer. Preferred features of the first and second aspects of the present invention are recited in the Claims appended hereto. Because of their strong alkalinity, triamine stripping solutions for use in a preferred embodiment of the process according to the present invention are able to remove ion implanted positive photoresist, even at heavy doses employed for VLSI fabrication. At the same time, these solutions do not attack the substrate materials commonly employed in integrated circuit fabrication, including silicon, silicon dioxide, silicon nitride and gallium arsenide under normal processing conditions. While the prebaking process is especially advantageous when used in conjunction with the triamine stripping solutions, such a prebaking process also makes positive organic photoresist easier to remove with other stripping liquids for the positive organic photoresist after ion implantation in the presence of the positive organic photoresist. The attainment of the foregoing and related objects, advantages and features of the invention should be more readily apparent to those skilled in the art, after review of the following more detailed description of the invention. Positive photoresists are based on the use of a novolac matrix resin and, typically, a diazoquinone photoactive compound or sensitizer. Novolac resins are soluble in common organic solvents are also soluble in aqueous base solutions by virtue of the acidic characteristic of their phenolic functionality. The diazoquinone derivatives are soluble in common organic solvents but are insoluble in aqueous bases. Upon exposure to light, these substances undergo a series of reactions that culminate in the formation of an indene carboxylic acid. The photoproduct, unlike its precursor, is extremely soluble in aqueous bases by virtue of its carboxylic acid functionality. These substances will react with transition and non-transition metals, such as phosphorous, arsenic, and antimony to create a vast chemistry of organometallic compounds. During ion implantation, the photoresist is exposed to high energy bombardment, which is an ideal environment for the formation of the organometallic compounds. These organometallic compounds have different solubility properties, which make them difficult to solubilize in common solvents, and they are also impervious to strong oxidizing agents, such as sulfuric acid. The present process preferably uses a combination of a high temperature prebake, strongly alkaline solvents, a diethylene triamine and ultrasonic vibration to remove the metallized film by a lift off process. The high temperature prebake of the organometallic film ensures that the formation of the organometallic film is completed. The prebaking step is carried out at a temperature of between about 150 and 220°C., preferably between about 180 and 200°C, for a time of from about 15 minutes to about 30 minutes. The shorter times are used with the higher temperatures. Triamines which are useful in the process of this invention have the general formula wherein R 1 and R 2 are, independently in each case, a difunctional straight or branched chain hydrocarbyl or substituted hydrocarbyl group having from about 2 to about 20 carbon atoms, including straight and branched chain, heterocyclic, aromatic, halogen, hydroxy and cyano substituted aliphatic groups. Suitable specific examples of operable triamines for the composition and process of this invention include diethylene triamine, 1 benzyl- and 1 cyanoethyl- substituted diethylene triamine, 1,2 dibenzyl diethylene triamine, lauryl diethylene triamine, N-(2 hydroxyethyl) diethylene triamine, N-(2 hydroxypropyl) diethylene triamine, and the like. The preferred triamine is diethylene triamine. Suitable specific examples of polar organic solvents for use in the process include N-methyl pyrrolidone, dimethyl formamide, butyrolactone, glycol ether, glycol ether acetal, and the like. The preferred polar organic solvents are N-methyl pyrrolidone and dimethyl formamide. Suitable specific examples of nonpolar organic solvents include aliphatic and aromatic hydrocarbon and chlorinated hydrocarbon solvents, such as benzene, alkylbenzenes, mineral spirits, and the like. The preferred nonpolar organic solvents are aromatic and chlorinated solvents. The solvents may be used singly or as mixtures. High boiling point solvents should be used, due to the elevated temperatures employed in the process. The preferred composition range is from about 40 to about 75 weight percent of the triamine and from about 60 to about 25 weight percent of the organic solvent, with about 50 weight percent of each component being especially preferred. It is preferred to subject the photoresist to be stripped with the process of this invention to ultrasonic energy while contacting the photoresist with the triamine composition to assist in complete removal of the photoresist, particularly after subjecting the photoresist to higher dose levels of ion implantation. Conventional conditions for the application of the ultrasonic energy are employed for this purpose, such as through the use of an ultrasonic transducer operating at a frequency of about 30 to 50 MHz and a power of from about 0.1 to about 2.5 watts/in 3 mounted externally on a container holding the photoresist coated wafers and the triamine stripping composition. The process of this invention is suitable for use with all of the commonly employed positive photoresist used in the semiconductor industry. Examples of suitable positive photoresists include Shipley 1325 and 1822 resists, MacDermid EPA 914 resist, Kodak 820 and 825 resists and Dyna-Chem Thiokol OFPR-800 resist, and the like. The following non-limiting examples represent preferred forms and best modes contemplated by the inventor for practice of his invention, as well as illustrating the results obtained through its use. EXAMPLE 1 Silicon dioxide coated silicon wafers were primed with hexamethyl disilizane (HMDS) and commercially available Kodak 825, OFPR-800, Shipley 1375 and 1822 and MacDermid 914 photoresists were spun on and baked at 150°C for 30 minutes, in accordance with the instructions of each photoresist supplier. The photoresist coated wafers were implanted with arsenic at energy levels of 80, 100, 120 and 150 KeV at dosage levels of 1 x 10 10 and 1 x 10 16 ions/cm 2 . The photoresist was then stripped in 40 and 50 weight percent solutions of diethylene triamine in N-methyl pyrollidone using the following procedure: The wafers were pre-baked at 180°C for 15 minutes. 600 ml of the diethylene triamine stripping solutions were placed in a beaker and heated to 90±5°C. The wafers were put in the stripper solution for two to five minutes, transferred to a deionized water dump rinser for five minutes and visually inspected for photoresist residue, giving the results shown in Table 1. For comparative purposes, wafers prepared according to the above procedure were also stripped with commercially available Posistrip 830 diglycolamine solution. Implant Energy (KeV) Solution A 50% triamine/50% NMP Solution B 40% triamine/60% NMP Posistrip 830 Implant Dose: 1 x 10 10 80 Complete Removal by Dissolving in 2 minutes Complete Removal by Dissolving in 5 minutes Non-removal 100 " " " 120 " Complete Removal in 5 minutes by Lift Off " 150 " " " Implant Dose: 1 x 10 16 80 95% Removal 80% Removal " 100 80% " 75% " " 120 60% " 50% " " 150 50% " 30% " " The above results show that the diethylene triamine solutions successfully stripped the photoresists at ion implanted dosage levels of 1 x 10 10 ions/cm 2 by dissolving the photoresist and produced incomplete photoresist removal at ion implanted dosage levels of 1 x 10 15 ions/cm 2 . The diglycolamine solution failed to remove the photoresist at both dosage levels. EXAMPLE 2 The procedure of Example 1 was repeated, but with arsenic ion implanted dosage level wafers of 1 x 10 16 ions/cm 2 , a stripping solution temperature of 100±5°C., a stripping time of from 1 to 5 minutes and with the heated stripping solutions in an ultrasonic bath with an external ultrasonic transducer operating at 40 Mhz and a power level of 0.2 watts/in 3 . The results obtained are shown below in Table II. Implant Energy (KeV) Solution A 50% triamine/50% NMP Solution B 40% triamine/60% NMP Posistrip 830 Implant Dose: 1 x 10 16 80 Complete Removal in 1 minute Complete Removal in 1 minute Non-removal 100 " " " 120 " " " 150 " " " The above results show that the diethylene triamine solutions successfully stripped the photoresists at the heavy ion implanted dosage level by a lift off process, but the diglycolamina solution again was unable to remove the photoresists. EXAMPLE 3 (comparative) The diethylene triamine solutions as in Example 1 were used to strip photoresist coated wafers prepared as in Example 1, but with no prebake of the photoresist on the wafers and with N-methyl pyrrolidone alone used as a comparative stripper. 600 ml of the diethylene triamine stripping solutions were placed in a beaker and heated to 110°C. The wafers were put in the stripping solution for five minutes, transferred to a deionized water dump rinser or a spray rinser for 5 minutes and visually inspected for photoresist residue. The diethylene triamine solutions successfully stripped the photoresists at ion implanted dosage levels of 1 x 10 10 ions/cm 2 by dissolving the photoresist and produced 65% photoresist removal at ion implanted dosage levels of 1 x 10 16 ions/cm 2 . with the use of N-methyl pyrrolidone alone, only 45% photoresist removal was obtained at both dosage levels. EXAMPLE 4 (comparative) The diethylene triamine solutions as in Example 1 were used to strip photoresist coated wafers prepared as in Example 1, but with no prebake of the photoresist on the wafers, with applying ultrasonic energy during the photoresist stripping using the following procedure. A quantity of 2 gallons of diethylene triamine stripping solutions were placed in a five gallon tank with an external ultrasonic transducer and heated to 110°C. The wafers were put in the stripping solution for five minutes with the external ultrasonic transducer operating at 40 Mhz and a power level of 0.7 watts/in 3 . The wafers were then transferred to a deionized water pump rinser or spray rinser for 5 minutes and visually inspected for photoresist residue. The diethylene triamine solutions successfully stripped the photoresists at ion implanted dosage levels of 1 x 10 10 ions/cm 2 by dissolving the photoresist and produced 80% photoresist removal at ion implanted dosage levels of 1 x 10 16 ions/cm 2 . A 100 percent removal of the photoresists was obtained at the higher dose level by increasing the stripping time to 30 minutes. EXAMPLE 5 The diethylene triamine solutions as in Example 1 were used to strip photoresist coated wafers prepared as in Example 1, including the prebaking step, but without application of ultrasonic energy, using the following procedure. A quantity of 600 ml. of the diethylene triamine solution was placed in a beaker and heated to 110°C. The wafers were put in the stripping solution five five minutes, transferred to a deionized water pump rinser or spray rinser for 5 minutes and visually inspected for photoresist residue. The results showed that the diethylene triamine solutions successfully stripped the photoresists at ion implanted dosage levels of 1 x10 10 ions/cm 2 by dissolving the photoresists and produced 75% photoresist removal at the higher ion implantation dose level. EXAMPLE 6 The diethylene triamine solutions as in Example 1 were used to strip photoresist coated wafers prepared as in Example 1, including the prebaking step, with applying ultrasonic energy during the photoresist stripping and with N-methyl pyrrolidone alone used as a comparative stripper using the following procedure. A quantity of 2 gallons of diethylene triamine stripping solutions were placed in a five gallon tank with an external ultrasonic transducer and heated to 110°C. The wafers were put in the stripping solution for five minutes with the external ultrasonic transducer operating at 40 Mhz and a power level of 0.7 watts/in 3 . The wafers were then transferred to a deionized water pump rinser or spray rinser for 5 minutes and visually inspected for photoresist residue. The diethylene triamine solutions successfully stripped the photoresists at ion implanted dosage levels of 1 x 10 10 ions/cm 2 by dissolving the photoresist and produced 100% photoresist removal at ion implanted dosage levels of 1 x 10 16 ions/cm 2 . The diethylene triamine solutions successfully stripped the photoresists at the higher ion implantation dosage level by a lift off process, but N-methyl pyrrolidone produced incomplete photoresist removal at both dosage levels. EXAMPLE 7 Wafers prepared according to the procedure of Example 1, but ion implanted with boron at 150 KeV and a dosage level of 1 x10 16 ions/cm 2 were stripped in a solution consisting of 75 weight percent diethylene triamine in dimethyl formamide, using the stripping procedure of Example 6. The results showed 100% removal of the photoresists within 5 minutes stripping time. Substitution of other triamines in the procedures of the above examples produces equivalent advantageous results. It should now be readily apparent to those skilled in the art that a novel photoresist stripping process capable of achieving the stated objects of the invention has been provided. The process completely removes ion implanted positive photoresist from semiconductor wafers without attacking the wafers, even at high ion implantation dosing levels. The process is suitable for use with the commonly employed positive photoresists used in VLSI integrated circuit fabrication. It should further be apparent to those skilled in the art that various changes in form and details of the invention as shown and described may be made. The scope of the invention is defined by the claims appended hereto.

Claims: A process for stripping an ion-implanted positive organic photoresist from a substrate, which comprises prebaking the ion-implanted positive organic photoresist at a temperature in the range of from 150 to 220°C for a period of time of from 15 minutes to 30 minutes, then contacting the ion-implanted positive organic photoresist with a liquid photoresist stripper for a time sufficient to remove the ion-implanted positive organic photoresist from the substrate. A process as claimed in claim 1 additionally comprising subjecting the ion-implanted positive organic photoresist to ultrasonic vibration while contacting the ion-implanted positive organic photoresist with the liquid photoresist stripper. A process as claimed in claim 1 or claim 2 in which the ion-implanted positive organic photoresist layer is contacted with the liquid photoresist stripper at a temperature in the range of from 80°C to 120°C for a period of time of from 1 minute to 20 minutes. An integrated circuit fabrication process, which comprises forming a positive organic photoresist layer on a semiconductor wafer, defining an opening in the positive organic photoresist layer corresponding to a desired doping area in the semiconductor wafer, doping the semiconductor wafer by ion implanting a dopant impurity into the semiconductor wafer through the opening in the positive organic photoresist layer, prebaking the ion-implanted positive organic photoresist layer at a temperature in the range of from 150 to 220°C for a period of time of from 15 minutes to 30 minutes to make the ion-implanted positive organic photoresist layer more readily removable with a stripping liquid and contacting the ion-implanted positive organic photoresist layer with a liquid photoresist stripper for a time sufficient to remove the ion-implanted positive organic photoresist layer from the semiconductor wafer. An integrated circuit fabrication process as claimed in claim 4 additionally comprising subjecting the ion-implanted positive organic photoresist layer to ultrasonic vibration while contacting the ion-implanted positive organic photoresist layer with the liquid photoresist stripper. An integrated circuit fabrication process as claimed in any one of claims 4 to 5 in which the ion-implanted positive organic photoresist layer is contacted with the liquid photoresist stripper at a temperature in the range of from 80°C to 120°C for a period of time of from 1 minute to 20 minutes. A process as claimed in any one of the preceding claims in which the liquid photoresist stripper comprises a triamine in an amount of from 25 to 100 weight percent and a polar or nonpolar organic solvent in an amount of from 0 to 75 weight percent. A process as claimed in claim 7 in which the triamine is diethylene triamine. A process as claimed in claim 7 or claim 8 in which the organic solvent is N-methyl pyrrolidone or dimethyl formamide. A process as claimed in any one of claims 8 to 9 in which the triamine is present in an amount of from 40 to 75 weight percent and the organic solvent is present in an amount of from 25 weight percent to 60 weight percent.

Inventors: LEE WAI MUN, LEE, WAI MUN
Applicants: EKC TECHNOLOGY INC, EKC TECHNOLOGY, INC.
Application year: 1988
Main classification: G03F7
IPC codes: G03F7