Organic Heterojunction Transistors

Kim, Chang‐Hyun

doi:10.1021/acsaelm.2c00423

Cited by 12 publications

(5 citation statements)

References 60 publications

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“…Compared to 2D materials usually fabricated by a mechanical exfoliation method, organic materials, and their heterojunctions provide advantages regarding synthetic tunability, solution processability, and deposition scalability. [131][132][133][134] In 1995, the ambipolar characteristics were discovered in organic heterostructure transistors, explicitly utilizing a vertical p-type 6T/n-type C 60 molecular junction. [135] This breakthrough significantly advanced the development of organic light-emitting transistors and other organic heterojunction devices.…”

Section: Organic-based Heterojunctionsmentioning

confidence: 99%

“…Due to their inherent mechanical flexibility, lightweight nature, and low-cost fabrication, flexible organic electronics are promising building blocks for future IoT devices. [131] This also recently attracted much research interest in mechanical flexible ternary inverters based on organic semiconductor materials. [46,83,85] In 2021, Panigrahi et al reported the first flexible organic AAT and ternary inverter based on polyethylene naphthalate (PEN) substrate, as presented in Figure 22a,b.…”

Section: Organic Materials-based Ternary Invertersmentioning

confidence: 99%

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Anti‐Ambipolar Heterojunctions: Materials, Devices, and Circuits

Meng,

Wang,

Wang

et al. 2023

Advanced Materials

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Anti‐ambipolar heterojunctions are vital in constructing high‐frequency oscillators, fast switches, and multivalued logic (MVL) devices, which hold promising potential for next‐generation integrated circuit chips and telecommunication technologies. Thanks to strategic material design and device integration, anti‐ambipolar heterojunctions have demonstrated unparalleled device and circuit performance that surpasses other semiconducting material systems. This review aims to provide a comprehensive summary of the achievements in the field of anti‐ambipolar heterojunctions. First, we discuss the fundamental operating mechanisms of anti‐ambipolar devices. After that, potential materials used in anti‐ambipolar devices are discussed with particular attention to 2D‐based, 1D‐based, and organic‐based heterojunctions. Next, we overview the primary device applications employing anti‐ambipolar heterojunctions, including anti‐ambipolar transistors (AATs), photodetectors, frequency doublers, and synaptic devices. Furthermore, alongside the advancements in individual devices, the practical integration of these devices at the circuit level, including topics such as MVL circuits, complex logic gates, and spiking neuron circuits, is also discussed. Lastly, the present key challenges and future research directions concerning anti‐ambipolar heterojunctions and their applications are also emphasized.This article is protected by copyright. All rights reserved

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Section: Organic-based Heterojunctionsmentioning

confidence: 99%

Section: Organic Materials-based Ternary Invertersmentioning

confidence: 99%

Anti‐Ambipolar Heterojunctions: Materials, Devices, and Circuits

Meng,

Wang,

Wang

et al. 2023

Advanced Materials

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“…A promising approach to MVL implementation is the use of p-n heterojunction-based antiambipolar transistors (AATs), which exploit the negative differential transconductance (NDT) characteristics of such heterojunctions. [9][10][11][12] AATs enable the fabrication of MVL circuits, including ternary and quaternary logic circuits, using only two transistors. [13][14][15][16][17][18][19][20][21][22] Moreover, the NDT characteristics of AATs enable the implementation of electrically reconfigurable logic gates, achieving multiple logic gate operations using a single "double-gated AAT" that are not obtainable in conventional p or n-type transistors.…”

Section: Doi: 101002/admt202301049mentioning

confidence: 99%

Performance Enhancement of Organic Ternary Logic Circuits through UV Irradiation and Geometry Optimization

Panigrahi,

Hayakawa,

Aimi

et al. 2023

Adv Materials Technologies

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Multivalued logic (MVL) circuits offer higher information density compared with conventional binary logic circuits. However, achieving a proper balance between logic states and a low‐voltage gain remains a challenge in MVL devices. This study proposes two strategies to address this problem: using the optical absorption of organic semiconductors and optimizing device geometry. A ternary inverter is fabricated using a series circuit consisting of an antiambipolar transistor with a heterojunction of C8‐BTBT and PTCDI‐C8 semiconductors and a PTCDI‐C8 transistor. Although the inverter exhibits three distinct logic levels, it suffers from an inadequate voltage balance between the ternary logic states. To overcome this, UV light irradiation is employed first to modulate the transistor characteristics, thus improving the output voltage level and input voltage range of the logic ½ state. Subsequently, the channel length of the PTCDI‐C8 transistor is optimized to further enhance the voltage transfer characteristics of the inverter. Through these combined techniques, ideal output voltage levels are achieved for all three logic states along with an enhanced voltage gain during the transition from the logic ½ state to the logic 0 state. This work is thus an advancement toward reliable, efficient organic ternary logic circuits.

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“…[14][15][16] The construction of a heterostructure channel layer using p-type and n-type semiconductor materials can realize the dual channel transmission of holes and electrons while also allowing for the controllable adjustment of bidirectional photoresponse under light illumination. [17] The photoresponse effect can be classified as positive or negative based on whether the channel photocurrent of the phototransistor increases or decreases in response to light. [18] At present, the study of photoresponse in organic materials is primarily focused on the positive photoresponse of the photoelectric effect.…”

Section: Introductionmentioning

confidence: 99%

Organic Heterojunction Phototransistors with Bi‐Directional Photoresponse for Vision Biomimetics

Shi,

Xu,

Liu

et al. 2024

Adv Funct Materials

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The scientific community is very interested in artificial visual perception systems because of their neuromorphological capabilities, such as image recognition, learning, and memory. This study reports on an organic heterojunction ambipolar transistor with PTCDI‐C8/C8‐BTBT/PTCDI‐C8 sandwich structure. The proposed transistor efficiently transports both holes and electrons, with a current‐on‐switch ratio of ≈106. Furthermore, hole or electron carrier transmission mechanisms are constructed to achieve the controllable adjustment of bi‐directional photoresponse under identical light illumination conditions by adjusting the gate voltage (positive photoresponse for Vg = 30 V and negative photoresponse for Vg = −30 V). The basic synaptic behaviors are simulated under light illumination, and the power consumption of the device is 18.51 fJ per synaptic event, which is comparable to the energy required for biological synapses. Finally, the simulation of human visual adaptation is completed using the bi‐directional photoresponse effects of the organic heterojunction phototransistor array, which provides a novel idea for neuromorphic visual simulation.

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Organic Heterojunction Transistors

Cited by 12 publications

References 60 publications

Anti‐Ambipolar Heterojunctions: Materials, Devices, and Circuits

Anti‐Ambipolar Heterojunctions: Materials, Devices, and Circuits

Performance Enhancement of Organic Ternary Logic Circuits through UV Irradiation and Geometry Optimization

Organic Heterojunction Phototransistors with Bi‐Directional Photoresponse for Vision Biomimetics

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