High-Performance Single-Microplate Perovskite Photodetectors Based on Polyvinyl Alcohol Filled Planar Electrodes for Weak-Light Imaging and Pixel Integration,Advanced Functional Materials

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High-Performance Single-Microplate Perovskite Photodetectors Based on Polyvinyl Alcohol Filled Planar Electrodes for Weak-Light Imaging and Pixel Integration
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2024-09-17 , DOI: 10.1002/adfm.202410575
Luyao Mei _{1,

2} , Wenzhi Yu ₃ , Nan Cui ₃ , Yang Li ₃ , Tian Yang ₁ , Jianjian Fei ₁ , Zhanfeng Huang ₁ , Zhengji Xu ₁ , Haoran Mu ₃ , Shenghuang Lin ₃ , Lu Zhu ₁

Affiliation

Photoconductors featuring an individual micro/nano-crystal as the photoactive channel hold the great promise for next-generation integrated optoelectronics. Meanwhile, the gain aiming for signal amplification without an extra amplifier, the fast response for fast data transfer, and low dark current for weak signal acquisition are highly desirable in integrated optoelectronics, but are inherent trade-off in traditional photoconductors. Herein, the study demonstrates a single-microplate MAPbI₃ photoconductor based on polyvinyl alcohol-filled planar electrodes that can simultaneously achieve excellent performance on these parameters. The superior performance can be attributed to the exquisite design of filling the device channel gap with polyvinyl alcohol. This deep-work-function transparent polyvinyl alcohol can not only passivate surface defects of the perovskite microplate by hydrogen bonding, but also form a heterojunction with top perovskites to induce a depleted channel. Resultant single-microplate photodetectors exhibit exceptional performance characteristics including ultra-low noise-equivalent power of 0.19 fW Hz^−1/2, high specific detectivity of 3.68 × 10¹⁴ Jones, fast response of 3.2 µs, high EQE-bandwidth over 10⁷ Hz, as well as excellent stability. More importantly, single-microplate MAPbI₃ photoconductors demonstrate ultra-weak-light imaging ability surpassing silicon counterparts. Furthermore, the successful integration of their microplate pixels showcases the promising prospect for integrated optoelectronics.

中文翻译：

基于聚乙烯醇填充平面电极的高性能单微孔板钙钛矿光电探测器，用于弱光成像和像素集成

以单个微/纳米晶体作为光有效通道的光导体为下一代集成光电子学带来了巨大的前景。同时，集成光电子器件非常需要无需额外放大器即可放大信号的增益、快速数据传输的快速响应以及用于弱信号采集的低暗电流，但这是传统光导体固有的权衡。在此，该研究展示了一种基于聚乙烯醇填充平面电极的单微孔板 MAPbI₃ 光导体，它可以同时在这些参数上实现优异的性能。卓越的性能可归因于用聚乙烯醇填充器件通道间隙的精美设计。这种具有深功功能的透明聚乙烯醇不仅可以通过氢键钝化钙钛矿微孔板的表面缺陷，还可以与顶部钙钛矿形成异质结，诱导耗尽通道。所得的单微孔板光电探测器表现出卓越的性能特征，包括 0.19 fW ^Hz-1/2 的超低噪声等效功率、3.68 × 10¹⁴ Jones 的高特异性探测率、3.2 μs 的快速响应、超过 10⁷ Hz 的高 EQE 带宽以及出色的稳定性。更重要的是，单微孔板 MAPbI₃ 光电导体表现出超越硅同类产品的超弱光成像能力。此外，他们的微孔板像素的成功集成展示了集成光电子学的光明前景。

更新日期：2024-09-17

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