Organic multilevel (opto)electronic memories towards neuromorphic applications

He, Lin; Yang, Zuchong; Wang, Zhiming; Leydecker, Tim; Orgiu, Emanuele

doi:10.1039/d3nr01311a

Cited by 2 publications

(1 citation statement)

References 216 publications

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“…[ 5 , 6 ] However, the forefront of electronic research is currently dominated by memory and neuromorphic computing in the organic electronics domain. [ 7 , 8 , 9 , 10 , 11 , 12 , 13 ] Organic field‐effect transistor (OFET) memory, among various configurations, emerges as a promising technology, offering lightweight, cost‐effective, and flexible charge storage solutions. In recent decades, significant advancements have been made in improving the performance of organic field‐effect transistors (OFETs), particularly in terms of charge carrier mobility and operational stability.…”

Section: Introductionmentioning

confidence: 99%

Photophore‐Anchored Molecular Switch for High‐Performance Nonvolatile Organic Memory Transistor

Hassan,

Kwon,

Lee

et al. 2024

Advanced Science

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Over the past decade, molecular‐switch‐embedded memory devices, particularly field‐effect transistors (FETs), have gained significant interest. Molecular switches are integrated to regulate the resistance or current levels in FETs. Despite substantial efforts, realizing large memory window with a long retention time, a critical factor in memory device functionality, remains a challenge. This is due to the inability of an isomeric state of a molecular switch to serve as a stable deep trap state within the semiconductor layer. Herein, the study addresses this limitation by introducing chemical bonding between molecular switch and conjugated polymeric semiconductor, facilitating closed isomer of diarylethene (DAE) to operate as a morphologically stable deep trap state. Azide‐ and diazirine‐anchored DAEs are synthesized, which form chemical bonds to the polymer through photocrosslinking, thereby implementing permanent and controllable trapping states nearby conjugated backbone of polymer semiconductor. Consequently, when diazirine‐anchored DAE is blended with F8T2 and subjected to photocrosslinking, the resulting organic FETs exhibit remarkable memory performance, including a memory window of 22 V with a retention time over 106 s, a high photoprogrammable on/off ratio over 103, and a high operational stability over 100 photocycles. Further, photophore‐anchored DAEs can achieve precise patterning, which enables meticulous control over the semiconductor layer structure.

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Section: Introductionmentioning

confidence: 99%

Photophore‐Anchored Molecular Switch for High‐Performance Nonvolatile Organic Memory Transistor

Hassan,

Kwon,

Lee

et al. 2024

Advanced Science

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Organic Multibit Phototransistor Memories with High External Quantum Efficiency

Bai,

Haase,

Hambsch

et al. 2024

Adv Elect Materials

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This work reports phototransistor memory devices fabricated using organic planar heterojunctions of two organic semiconductor materials, namely poly(2,5‐bis(2‐octyldodecyl)−3,6‐di(pyridin‐2‐yl)‐pyrrolo[3,4‐c]pyrrole‐1,4(2H,5H)‐dione‐alt‐2,2′‐bithiophene) (PDBPyBT) and 2,9‐didecyldinaphtho[2,3‐b:2′,3′‐f]thieno[3,2‐b]thiophene (C10‐DNTT). The results of the study show a broad spectral sensitivity, ranging from UV light to red light. It is found that both organic layers are photoactive but also both play a role in the device's charge‐trapping properties: the PDBPyBT layer is effective in trapping holes while the C10‐DNTT layer traps electrons. The thickness of the PDBPyBT layer is identified as a crucial factor affecting the device performance, with the devices featuring a ≈20 nm thick PDBPyBT layer exhibiting a light‐induced hysteresis of ≈40 V. While the devices with a “ribbon” structured PDBPyBT layer demonstrate a linear response to the increasing light exposures duration. Furthermore, a new method is introduced to evaluate the external quantum efficiency (EQE) of the phototransistor memories in order to provide a robust metric that allows a benchmarking comparison of such devices' performance. When assessed using this EQE metric, these devices exhibit exceptionally high efficiency of trapping photogenerated charges compared to other reports. This study also demonstrates that the devices possess multibit programming capabilities, suggesting their potential use in dosimetry applications.

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Organic multilevel (opto)electronic memories towards neuromorphic applications

Abstract: In the past decades, neuromorphic computing has attracted the interest of the scientific community due to its potential to circumvent the von Neumann bottleneck. Organic materials, owing to their fine...

Cited by 2 publications

References 216 publications

Photophore‐Anchored Molecular Switch for High‐Performance Nonvolatile Organic Memory Transistor

Photophore‐Anchored Molecular Switch for High‐Performance Nonvolatile Organic Memory Transistor

Organic Multibit Phototransistor Memories with High External Quantum Efficiency

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