Search query: Organic bistable molecular memory using photochromic diarylethene

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abstract: A principle of organic memory device using a bistable photochromic molecule is presented that allows extremely high bit densities and very low power consumption. This device is based on an isomerization reaction of photochromic diarylethene molecule via its excited state by an electric carrier injection, not by photon absorption. Experimental data show that the reversible writing and nondestructive reading of information by the carrier injection is feasible. The advantages and properties of such an organic semiconductor memory using a bistable molecule are discussed.
author_names: Tsuyoshi Tsujioka

Hayato Kondo
title: Organic bistable molecular memory using photochromic diarylethene
year: 2003

abstract: Device structure dependence of the recording efficiency of organic bistable molecular memory using photochromic diarylethene (DAE) was studied. Devices with a thicker memory layer showed faster current decrease, that is, shorter writing time. This was attributed to effective isomerization at the many carrier traps in the memory layer. The device with an electron transport layer that consisted of a Silole derivative showed fast writing speed. The device with an Alq3 electron transport layer showed electroluminescence. This indicates the holes were transported through the DAE layer without contribution for isomerization. DAE molecules with good receptivity for both carriers should be developed for obtaining high speed memory.
author_names: Tsuyoshi Tsujioka

M Shimizu

Eiji Ishihara
title: Organic bistable memory characteristics with a photochromic diarylethene layer
year: 2005

abstract: A series of photochromic diarylethenes with different bridge moieties have been investigated as light sensitive components of photoswitchable organic field effect transistors. It was shown that the presence of a carbonyl group and its position in the ethene bridge of the diarylethene molecule affects strongly the electrical performance and stability of the devices. In particular, compounds with carbonyl groups revealed stronger light induced switching effects (wider memory windows) while the stability of the formed electrical states was very modest. On the contrary, devices possessing a non polar cyclopentene bridge required longer times for switching, while the induced electrical states demonstrated excellent stability required for memory cells. The established molecular structure device performance relationship and revealed device operation mechanisms should facilitate the rational design of new materials for advanced optical memories, thus paving a way towards their practical implementation.
author_names: Dolgor D Dashitsyrenova

Andrey G Lvov

Lyubov A Frolova

Alexander V Kulikov

Nadezhda N Dremova

Valerii Z Shirinian

Sergey M Aldoshin

Mikhail M Krayushkin

Pavel A Troshin
title: Molecular structure electrical performance relationship for OFET based memory elements comprising unsymmetrical photochromic diarylethenes
year: 2019

abstract: Hole injection recording of organic semiconductor memory with a photochromic diarylethene memory layer was investigated by using a device structure with an electron block layer (EBL) Devices with thicker EBL showed faster current decrease, that is, high isomerization efficiency. The high efficiency of isomerization originating from the long lifetime of a cationic state was achieved by hole injection with low voltage. Hole isomerization recording has the potential for very low power consumption organic memory.
author_names: Tsuyoshi Tsujioka

Natsuko Iefuji

A Jiapaer

Masahiro Irie

Shinichiro Nakamura
title: Hole injection isomerization of photochromic diarylethene for organic molecular memory
year: 2006

abstract: Self assembled monolayers (SAMs) deposited on bottom electrodes are commonly used to tune charge carrier injection or blocking in optoelectronic devices. Beside the enhancement of device performance, the fabrication of multifunctional devices in which the output can be modulated by multiple external stimuli remains a challenging target. In this work, we report the functionalization of an indium tin oxide (ITO) electrode with a SAM of a diarylethene derivative designed for optically control the electronic properties. Following the demonstration of dense SAM formation and its photochromic activity, as a proof of principle, an organic light emitting diode (OLED) embedding the light responsive SAM covered electrode was fabricated and characterized. Optically addressing the two terminal device by irradiation with ultraviolet light doubles the electroluminescence. The original value can be restored reversibly by irradiation with visible light. This expanded functionality is based on the photoinduced modulation of the electronic structure of the diarylethene isomers, which impact the charge carriers' confinement within the emissive layer. This approach could be successfully exploited in the field of opto communication technology, for example to fabricate opto electronic logic circuits.
author_names: Giovanni Ligorio

Giovanni F Cotella

Aurelio Bonasera

Nicolas Zorn Morales

Giuseppe Carnicella

Bjorn Kobin

Qiankun Wang

Norbert Koch

Stefan Hecht

Emil J W List-Kratochvil

Franco Cacialli
title: Modulating the luminance of organic light emitting diodes via optical stimulation of a photochromic molecular monolayer at transparent oxide electrode.
venue: Nanoscale
year: 2020

abstract: When photochromic molecules are organized in a crystal, the small scale forces generated by molecular photoisomerization events can combine together to generate work on micro or macroscopic length scales. In this work, photomechanical nanocrystals themselves are organized on macroscopic length scales using a porous inorganic template. The organic diarylethene component provides the reversible photoresponse, whereas the porous alumina component provides structural support and directionality. This hybrid organic inorganic photomechanical material acts as a bending actuator. Using ultraviolet and visible photons as power inputs, as little as 0.1 mg of reacted material generates enough force to tilt a 1.28 g mirror and steer a laser beam. The motion can be cycled multiple times in air and under water. Actuator figures of merit such as energy to work conversion efficiency and stiffness are probably limited by the high elastic modulus of the inorganic template, providing an obvious pathway for optimization.
author_names: Xinning Dong

Fei Tong

Kerry M Hanson

Rabih O Al-Kaysi

Daichi Kitagawa

Seiya Kobatake

Christopher J Bardeen
title: Hybrid Organic Inorganic Photon Powered Actuators Based on Aligned Diarylethene Nanocrystals
year: 2019

abstract: ABSTRACT This paper presents a principle for a novel electrical molecular memory device using a photochromic diarylethene, which has the potential ability of inexpensive, disposable, extremely high bit density, and very low power consumption. This device is based on an isomerization reaction of the diarylethene molecule via its excited state by injection of electric carriers, not by photon absorption. The reversible writing by carrier injection is demonstrated. The advantages and applications of the molecular memory are discussed.
author_names: Tsuyoshi Tsujioka
title: Electrical Molecular Memory Using Diarylethene Derivatives
year: 2005

abstract: We developed a novel field effect transistor (FET) type photorewritable memory using a photochromic interface layer between the active layer and the gate insulator layer. A diarylethene (DAE) derivative was employed as a photochromic material and pentacene was employed as an active layer. DAE has two types of photoisomer, i.e. the closed and open ring isomers. In this study, it was clarified that the highest occupied molecular orbital (HOMO) level of the closed ring DAE worked as an interfacial deep trap level, and that the generation of the interfacial deep trap level by photoisomerization induced the photoswitching and photomemory behaviors of transistor properties.
author_names: Manabu Yoshida

Kouji Suemori

Sei Uemura

Satoshi Hoshino

Noriyuki Takada

Takehito Kodzasa

Toshihide Kamata
title: Development of Field Effect Transistor Type Photorewritable Memory Using Photochromic Interface Layer
year: 2010

abstract: Abstract Photochromic films have attracted interest as an organic semiconductive memory material. Isomerization structures of a photochromic diarylethene (DAE) film induced by electrical carrier injection were investigated and were made clear for the coloring reaction mode (CRM) and decoloring reaction mode (DRM) Filaments consisting of the colored molecules in the colorless matrix were generated in the CRM, while random distribution of isomerized molecules occurred in the DRM. The ON OFF ratio in current in the CRM was larger than that in the DRM. These results would be important for constructing organic semiconductor memory device using DAE.
author_names: Kazuki Yamamoto

Tsuyoshi Tsujioka
title: Isomerization structure of photochromic diarylethene film based on electrical carrier injection
year: 2016

abstract: A class of acceptor donor acceptor chromophoric small molecule non fullerene acceptors, 1 4, with difluoroboron(iii) b diketonate (BF2bdk) as the electron accepting moiety has been developed. Through the variation of the central donor unit and the modification on the peripheral substituents of the terminal BF2bdk acceptor unit, their photophysical and electrochemical properties have been systematically studied. Taking advantage of their low lying lowest unoccupied molecular orbital energy levels (from 3.65 to 3.72 eV) and relatively high electron mobility (7.49 x 10 4 cm2 V 1 s 1) these BF2bdk based compounds have been employed as non fullerene acceptors in organic solar cells with maximum power conversion efficiencies of up to 4.31% Moreover, bistable resistive memory characteristics with charge trapping mechanisms have been demonstrated in these BF2bdk based compounds. This work not only demonstrates for the first time the use of a boron(iii) b diketonate unit in constructing non fullerene acceptors, but also provides more insights into designing organic materials with multi functional properties.
author_names: Panpan Li

Quanbin Liang

Eugene Yau-Hin Hong

Chin-yiu Chan

Yat-Hin Cheng

Ming-Yi Leung

Mei-Yee Chan

Kam-Hung Low

Hongbin Wu

Vivian Wing-Wah Yam
title: Boron(iii) b diketonate based small molecules for functional non fullerene polymer solar cells and organic resistive memory devices+
venue: Chemical science
year: 2020