Achieving a high-performance, self-powered, broadband perovskite photodetector employing MAPbI3 microcrystal films,Journal of Materials Chemistry C

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Achieving a high-performance, self-powered, broadband perovskite photodetector employing MAPbI3 microcrystal films
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2019/12/17 , DOI: 10.1039/c9tc05668h
Xiyan Pan _{1,

2,

3,

4,

5} , Hai Zhou _{1,

2,

3,

4,

5} , Ronghuan Liu _{1,

2,

3,

4,

5} , Dingjun Wu _{1,

2,

3,

4,

5} , Zehao Song _{1,

2,

3,

4,

5} , Xiaoming Tang _{1,

2,

3,

4,

5} , Xiaohan Yang _{1,

2,

3,

4,

5} , Hao Wang _{1,

2,

3,

4,

5}

Affiliation

Organic–inorganic metal halide perovskites have achieved great success in applications such as light-emitting diodes, photodetectors (PDs) and solar cells due to their high light absorption coefficients, tunable band gaps and simple solution-process technologies. However, their polycrystalline films have low carrier mobility and high defect states, which limit the device performance. As substitutes, perovskite microcrystal (MC) films exhibit higher carrier mobility and lower defect state density and thus, they have received much attention in recent years. Herein, we introduce MAPbX₃ (X = Br, I) MC films with controllable thickness and adjustable band gap, and the self-powered MAPbI₃ perovskite MC PDs (MCPDs) with a structure of ITO glass/perovskite MC film/carbon have been assembled for the first time. By optimizing the thickness of the MC film, our hole-transport-layer-free (HTL-free) PDs exhibit excellent self-powered performance, with an on/off ratio as high as 2 × 10⁵, the rise/fall time of 80/580 μs, the responsivity of 0.26 A W⁻¹, the detectivity of 7.01 × 10¹¹ Jones and the linear dynamic range of 107 dB. In addition, our MCPDs without encapsulation show excellent light and storage stability. These results indicate a good method for preparing high-performance and high-stability perovskite MC devices.

中文翻译：

使用MAPbI3微晶膜实现高性能，自供电的宽带钙钛矿光电探测器

有机-无机金属卤化物钙钛矿因其高光吸收系数，可调节的带隙和简单的溶液处理技术而在诸如发光二极管，光电探测器（PD）和太阳能电池等应用中取得了巨大成功。然而，它们的多晶膜具有低载流子迁移率和高缺陷状态，这限制了器件性能。作为替代物，钙钛矿微晶（MC）膜表现出较高的载流子迁移率和较低的缺陷态密度，因此，近年来受到了很多关注。在这里，我们介绍具有可控制的厚度和可调节的带隙的MAPbX ₃（X = Br，I）MC膜，以及自供电的MAPbI ₃具有ITO玻璃/钙钛矿MC膜/碳结构的钙钛矿MC PD（MCPD）首次组装。通过优化MC膜的厚度，我们的无空穴传输层（无HTL）PD表现出出色的自供电性能，开/关比高达2×10 ⁵，上升/下降时间为80/580μs，响应度为0.26 AW ^-1，检测度为7.01×10 ¹¹ Jones，线性动态范围为107 dB。此外，我们的无封装MCPD表现出出色的光照和存储稳定性。这些结果表明制备高性能和高稳定性钙钛矿MC器件的良好方法。

更新日期：2020-02-13

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