<br>电荷管理实现高效的自发色彩适应双极光电探测器,Small

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电荷管理实现高效的自发色彩适应双极光电探测器
Small ( IF 13.0 ) Pub Date : 2023-12-12 , DOI: 10.1002/smll.202309827
Dan Zhao _{1,

2} , Yan Wang ₁ , Xianglang Sun _{1,

3} , Xin Wu ₁ , Bo Li ₁ , Shoufeng Zhang _{1,

4} , Danpeng Gao ₁ , Baoze Liu ₁ , Shaokuan Gong ₅ , Zhen Li ₁ , Chunlei Zhang ₁ , Xihan Chen ₅ , Shuang Xiao ₆ , Shangfeng Yang ₇ , Zhong'an Li ₃ , Zonglong Zhu _{1,

8,

9}

Affiliation

Department of Chemistry, City University of Hong Kong, Kowloon, 999077, Hong Kong.
School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, P. R. China.
Key Laboratory for Material Chemistry of Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China.
Department of Electronic Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, P. R. China.
SUSTech Energy Institute for Carbon Neutrality, Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, 518055, P. R. China.
Center for Advanced Material Diagnostic Technology and College of Engineering Physics, Shenzhen Technology University, Shenzhen, 518118, P. R. China.
Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, P. R. China.
City University of Hong Kong Shenzhen Research Institute, Shenzhen, Guangdong, 518057, P. R. China.
Hong Kong Institute of Clean Energy, City University of Hong Kong, Kowloon, 999077, Hong Kong.

溶液处理光电探测器已成为下一代可见-近红外（vis-NIR）光电探测器的有希望的候选者。这归因于它们易于加工、与柔性基板的兼容性以及通过集成互补光响应半导体来调整其检测特性的能力。然而，有限的性能继续阻碍其进一步发展，这主要受到钙钛矿和有机半导体之间电荷传输特性差异的影响。在这项工作中，引入了一种具有多光谱响应性的钙钛矿有机双极光电探测器（PD），这是通过有效管理钙钛矿和三元有机异质结中的电荷来实现的。三元异质结结合了设计的近红外客体受体，比二元异质结表现出更快的电荷转移速率和更长的载流子扩散长度。通过在钙钛矿和有机成分之间实现更平衡的载流子动态，PD在-0.2 V下实现了3.74 nA cm ^-2的低暗电流，以及<10 id=94>12 Jones的快速响应速度。此外，无需任何滤光片即可实现用于自发色彩适应的仿生视网膜专题系统。这种电荷管理策略开辟了超越光电检测局限性的可能性，并能够实现具有卓越空间分辨率和准确色彩再现的高纯度、紧凑型图像传感器。

"点击查看英文标题和摘要"

Charge Management Enables Efficient Spontaneous Chromatic Adaptation Bipolar Photodetector

Solution-processed photodetectors have emerged as promising candidates for next-generation of visible-near infrared (vis–NIR) photodetectors. This is attributed to their ease of processing, compatibility with flexible substrates, and the ability to tune their detection properties by integrating complementary photoresponsive semiconductors. However, the limited performance continues to hinder their further development, primarily influenced by the difference of charge transport properties between perovskite and organic semiconductors. In this work, a perovskite-organic bipolar photodetectors (PDs) is introduced with multispectral responsivity, achieved by effectively managing charges in perovskite and a ternary organic heterojunction. The ternary heterojunction, incorporating a designed NIR guest acceptor, exhibits a faster charge transfer rate and longer carrier diffusion length than the binary heterojunction. By achieving a more balanced carrier dynamic between the perovskite and organic components, the PD achieves a low dark current of 3.74 nA cm⁻² at −0.2 V, a fast response speed of <10 µs, and a detectivity of exceeding 10¹² Jones. Furthermore, a bioinspired retinotopic system for spontaneous chromatic adaptation is achieved without any optical filter. This charge management strategy opens up possibilities for surpassing the limitations of photodetection and enables the realization of high-purity, compact image sensors with exceptional spatial resolution and accurate color reproduction.

更新日期：2023-12-12

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