Flexible and Self‐Powered Lateral Photodetector Based on Inorganic Perovskite CsPbI3–CsPbBr3 Heterojunction Nanowire Array,Advanced Functional Materials

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Flexible and Self‐Powered Lateral Photodetector Based on Inorganic Perovskite CsPbI3–CsPbBr3 Heterojunction Nanowire Array
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-02-24 , DOI: 10.1002/adfm.201909771
Meng Wang ₁ , Wei Tian ₁ , Fengren Cao ₁ , Min Wang ₁ , Liang Li ₁

Affiliation

Self‐powered perovskite photodetectors mainly adopt the vertical heterojunction structure composed of active layer, electron–hole transfer layers, and electrodes, which results in the loss of incident light and interfacial accumulation of defects. To address these issues, a self‐powered lateral photodetector based on CsPbI₃–CsPbBr₃ heterojunction nanowire arrays is designed on both a rigid glass and a flexible polyethylene naphthalate substrate using an in situ conversion and mask‐assisted electrode fabrication method. Through adding the polyvinyl pyrrolidone and optimizing the concentration of precursors under the pressure‐assisted moulding process, both the crystallinity and stability of perovskite nanowire array are improved. The nanowire array–based lateral device shows a high responsivity of 125 mA W⁻¹ and a fast rise and decay time of 0.7 and 0.8 ms under a self‐powered operation condition. This work provides a new strategy to fabricate perovskite heterojunction nanoarrays towards self‐powered photodetection.

中文翻译：

基于无机钙钛矿CsPbI3–CsPbBr3异质结纳米线阵列的柔性自供电侧向光电探测器

自供电钙钛矿光电探测器主要采用由有源层，电子-空穴传输层和电极组成的垂直异质结结构，导致入射光的损失和缺陷的界面积累。为了解决这些问题，基于CsPbI ₃ –CsPbBr ₃的自供电横向光电探测器使用原位转换和掩模辅助电极制造方法在硬质玻璃和柔性聚萘二甲酸乙二醇酯基板上设计异质结纳米线阵列。通过添加聚乙烯吡咯烷酮并在压力辅助成型工艺中优化前体的浓度，钙钛矿纳米线阵列的结晶度和稳定性均得到改善。基于纳米线阵列的横向设备在自供电操作条件下显示出125 mA W ^-1的高响应度以及0.7和0.8 ms的快速上升和下降时间。这项工作提供了一种新的策略来制造钙钛矿异质结纳米阵列，用于自供电光检测。

更新日期：2020-04-21

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