Local stress enhanced photocurrent of visible light photo-detection in Cs2AgBiBr6 single crystal
Local stress enhanced photocurrent of visible light photo-detection in Cs2AgBiBr6 single crystal
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Cs2AgBiBr6 单晶中局部应力增强可见光光电检测的光电流
DOI：
10.1063/1.5116088
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发表时间：
2019-09
影响因子：
4
通讯作者：
Zhou Yanwen
中科院分区：
文献类型：
--
作者：
Li Tong;Wang Jing;Gao Ziyan;Lv Peng;Yang Yuben;Wu Junsheng;Hong Jiawang;Wang Xueyun;Zhou Yanwen
近年来，卤化物钙钛矿由于其基础科学意义和在能源收集领域的实际应用而引起了世界各国的关注。然而，其毒性和不稳定性阻碍了卤化物钙钛矿基器件的商业应用。最近发现的无机无铅Cs2AgBiBr6双钙钛矿材料具有优异的光学和电学性能，可以被认为是光伏器件的候选材料。在这项工作中，我们报告了Cs2AgBiBr6单晶作为光电探测器的宏观和微观性能。通过使用纳米级的探针作为顶电极，发现光生载流子被有效地收集，就像宏观电极的情况一样。更重要的是，Cs2AgBiBr6单晶的光电流随着纳米级机械载荷的增加而增大，这表明Cs2AgBiBr6单晶的局域禁带宽度随着纳米级应力的增加而减小，这与第一性原理计算结果相似。报道的这一发现确立了一种提高光电探测器性能的策略，这将对改善未来纳米级的光电子器件和能量采集设备的性能有很大帮助。
Halide perovskites have attracted worldwide attention in recent years due to their fundamental scientific importance and practical applications in energy harvesting fields. However, its toxicity and instability are hindering the commercial applications of halide perovskite-based devices. Recently discovered inorganic lead-free Cs2AgBiBr6 double perovskite exhibits excellent optical and electronic properties and can be considered as a candidate for photovoltaic devices. In this work, we report the photoelectric performance of the Cs2AgBiBr6 single crystal as a photodetector both macro- and microscopically. By utilizing a nanoscale probe as a top electrode, it is discovered that the photogenerated carriers are effectively collected, as in the case of macroscopic electrodes. More importantly, the photocurrent is enhanced as the applied nanoscale mechanical load increases, which indicates that the local bandgap of the Cs2AgBiBr6 single crystal decreases with the increased nanoscale stress, showing similar tendency with the first-principles calculation result. The reported finding establishes a strategy to enhance the performance of photodetectors, which will be a great help in improving the performance of future optoelectronic devices and energy harvesting devices at the nanoscale.
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