An Irradiance‐Adaptable Near‐Infrared Vertical Heterojunction Phototransistor (Adv. Mater. 40/2022)

Zhang, Mengyu; Chi, Zhiguo; Wang, Guoqing; Fan, Zelong; Wu, Honglei; Yang, Ping; Yang, Junbo; Yan, Peiguang; Sun, Zhenhua

doi:10.1002/adma.202270278

Cited by 10 publications

(19 citation statements)

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“…[ 21–36 ] Besides, the three‐terminal architecture enables such devices to achieve accelerating signal processing function utilizing the gate‐adjustable plasticity compared with two‐terminal synaptic devices. [ 37–40 ] Although currently reported optoelectronic synaptic transistors have also presented the capability of signal preprocessing, most of them respond to the photonic stimulation with specific wavelengths or limited wavelength range, and neglect the effect of gate voltage on data preprocessing. Consequently, to mimic the broadband sensing and preprocessing functions of the human retina, and further extend the retinal perception range beyond visible (vis) light, there is a high demand to develop optoelectronic synaptic transistors that can efficiently detect and preprocess light signals with the spectral range from ultraviolet (UV) to near‐infrared (NIR) light.…”

Section: Introductionmentioning

confidence: 99%

Retina‐Inspired Artificial Synapses with Ultraviolet to Near‐Infrared Broadband Responses for Energy‐Efficient Neuromorphic Visual Systems

Zhang

Guo

et al. 2023

Adv Funct Materials

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Neuromorphic visual system with image perception, memory, and preprocessing functions is expected to simulate basic features of the human retina. Organic optoelectronic synaptic transistors emulating biological synapses may be promising candidates for constructing neural morphological visual system. However, the sensing wavelength range of organic optoelectronic synaptic transistors usually limits their potential in artificial multispectral visual perception. Here, retina‐inspired optoelectronic synaptic transistors that present broadband responses covering ultraviolet, visible, and near‐infrared regions are demonstrated, which leverage the wide‐range photoresponsive charge trapping layer and the heterostructure formed between PbS quantum dots and organic semiconductor. Simplified neuromorphic visual arrays are developed to simulate comprehensive image perception, memory, and preprocessing functions. Benefitting from the flexibility of the charge trapping and organic semiconductor layers, a flexible neuromorphic visual array can be fabricated, having an ultralow power consumption of 0.55 fJ per event under a low operating voltage of −0.01 V. More significantly, an accelerating image preprocessing effect can be observed in a wide wavelength range even beyond the perception range of the human visual system, due to the gate‐adjustable synaptic plasticity. These devices are highly promising for implementing neuromorphic visual systems with broadband perception, increasing image processing efficiency, and promoting the development of artificial vision.

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Section: Introductionmentioning

confidence: 99%

Retina‐Inspired Artificial Synapses with Ultraviolet to Near‐Infrared Broadband Responses for Energy‐Efficient Neuromorphic Visual Systems

Zhang

Guo

et al. 2023

Adv Funct Materials

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“…Transparent electrodes or flat structured MSM structures can be adopted to solve this problem as shown in Figure a‐i. Graphene [ 31,32 ] and Indium tin oxide (ITO) [ 33,34 ] are available for transparent electrodes. Graphene can be large‐area grown and patterned for electrodes by lithography and etching, and ITO can be designed for electrodes by mask sputtering.…”

Section: Classification Of Structures Design and Fabrication Technologymentioning

confidence: 99%

“…Zhang et al. [ 32 ] implemented irradiance adaptable photodetectors based on a vertically stacking graphene/lead sulfide quantum dots/graphene heterojunction as shown in Figure 11e. The position of the Fermi energy level of graphene is modulated by the gate voltage, so that the defect states below the Fermi energy level in the forbidden band will be gradually filled, and trapped electrons above the Fermi level will be de‐trapped gradually over time.…”

Section: Design and Mechanism Of Photodetectors With Retina‐like Temp...mentioning

confidence: 99%

Progress in Bioinspired Photodetectors Design for Visual Information Processing

Deng

Wang

et al. 2023

Adv Funct Materials

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Rapid development of modern science and technology has prompted explosive growth of data volumes, especially the visual information, which brings heavy pressure on information processing and computation. The classic technical route to improve the computation power of image processing units by reducing the critical dimension of the transistors according to Moore's law gradually fails due to the physical limit of transistors’ footprint and the separated architectures. Inspired by human vision systems, retina‐like photodetectors that mimic their spatial and temporal properties have attracted widespread attention. These developed architectures enable the early data processing in‐ or near‐sensor, significantly reducing the computing power required in the back end. Herein, a comprehensive review on bioinspired photodetectors that possess the spatial and temporal properties of biological vision is provided. The properties of retina are summarized and presented first. Basic structure design and operation mechanism of those photodetectors with spatial properties of retina (including the distribution of receptive fields and the shape of the hemisphere) and temporal properties of retina (including the memory properties enabled learning and the light intensity adaptation) are reviewed thoroughly. Eventually, challenges and future perspectives are commented and provided to facilitate the rapid development of in‐ or near‐sensor computing photodetectors.

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“…Because the Fermi level can be regulated by the V G , the V G -controlled charge trapping process allows tunability of the photocurrent gain and decay times. Thus, the environmentally adaptive sensing behavior is well represented in this device . The device showed excellent performance with a responsivity of 2.16 × 10 4 A/W, a detectivity of 9.63 × 10 11 jones, and a rejection ratio ( I photo / I dark ) of 2.2 × 10 8 under 213 nm light illumination.…”

mentioning

confidence: 90%

“…Thus, the environmentally adaptive sensing behavior is well represented in this device. 22 The device showed excellent performance with a responsivity of 2.16 × 10 4 A/W, a detectivity of 9.63 × 10 11 jones, and a rejection ratio (I photo /I dark ) of 2.2 × 10 8 under 213 nm light illumination. This work shows the possibility of achieving a tunable SBPD to meet the requirements of different applications by simply adjusting its V G .…”

mentioning

confidence: 94%

High-Performance Diamond Phototransistor with Gate Controllable Gain and Speed

et al. 2023

J. Phys. Chem. Lett.

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This paper presents a fabricated solar-blind phototransistor based on hydrogen-terminated diamond. The phototransistor shows a large photocurrent and enhancement of responsivity over conventional two-terminal diamond-based photodetector. These enhancement effects are owing to the internal gain of the phototransistor. The fabricated phototransistor exhibits a high photoresponsivity (R) of 2.16 × 10 4 A/W and a detectivity (D*) of 9.63 × 10 11 jones, with gate voltage (V G ) and drain voltage of approximately −1.5 V and −5 V, respectively, under 213 nm light illumination. Even at ultralow operating voltage of −0.01 V, the device records satisfactory performance with R and D* of 146.7 A/W and 6.19 × 10 10 jones, respectively. By adjusting the V G , photocurrent generation in the device can be continuously tuned from the fast photoconductive effect to the optical gating effect with high optical gain. When V G increases from 1.4 to 2.4 V, the decay time decreases from 1512.0 to 25.5 ms. Therefore, responsivity, dark current, I photo /I dark , and decay time of the device can be well tuned by V G .

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An Irradiance‐Adaptable Near‐Infrared Vertical Heterojunction Phototransistor (Adv. Mater. 40/2022)

Cited by 10 publications

References 0 publications

Retina‐Inspired Artificial Synapses with Ultraviolet to Near‐Infrared Broadband Responses for Energy‐Efficient Neuromorphic Visual Systems

Retina‐Inspired Artificial Synapses with Ultraviolet to Near‐Infrared Broadband Responses for Energy‐Efficient Neuromorphic Visual Systems

Progress in Bioinspired Photodetectors Design for Visual Information Processing

High-Performance Diamond Phototransistor with Gate Controllable Gain and Speed

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