Highly Sensitive Low-Bandgap Perovskite Photodetectors with Response from Ultraviolet to the Near-Infrared Region
Highly Sensitive Low-Bandgap Perovskite Photodetectors with Response from Ultraviolet to the Near-Infrared Region
复制标题
具有从紫外线到近红外区域响应的高灵敏度低带隙钙钛矿光电探测器
DOI：
10.1002/adfm.201703953
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发表时间：
2017-11-10
影响因子：
19
通讯作者：
Yan, Yanfa
中科院分区：
文献类型：
--
作者：
Wang, Wenbin;Zhao, Dewei;Yan, Yanfa
由于目前使用最多的卤化铅钙钛矿型化合物具有较大的禁带宽度，因此获得宽带响应的钙钛矿型光电探测器是一个很大的挑战。所报告的PPD的响应范围限于紫外-可见光范围。在这里，高灵敏度的PPD被成功地制造为具有低带隙（接近1.25 eV）（FASnI（3））（0.6）（MAPbI（3））（0.4）钙钛矿作为活性层，表现出从300至1000 nm的宽带响应。PPD的性能可以通过调整钙钛矿和C-60层的厚度来优化。在-0.2 V偏压下，具有1000 nm厚钙钛矿层和70 nm厚C-60层的优化PPD在350 ~ 900 nm范围内表现出几乎平坦的外量子效率（EQE）光谱，EQE大于65%。同时，优化后的PPD在-0.2 V下的近红外区具有3.9 nA的暗电流抑制、超过0.4 A W-1的高响应率（R）、超过10（12）Jones的高比探测率（D*）。
It is a great challenge to obtain broadband response perovskite photodetectors (PPDs) due to the relatively large bandgaps of the most used methylammonium lead halide perovskites. The response range of the reported PPDs is limited in the ultraviolet-visible range. Here, highly sensitive PPDs are successfully fabricated with low bandgap (approximate to 1.25 eV) (FASnI(3))(0.6)(MAPbI(3))(0.4) perovskite as active layers, exhibiting a broadband response from 300 to 1000 nm. The performance of the PPDs can be optimized by adjusting the thicknesses of the perovskite and C-60 layers. The optimized PPDs with 1000 nm thick perovskite layer and 70 nm thick C-60 layer exhibit an almost flat external quantum efficiency (EQE) spectrum from 350 to 900 nm with EQE larger than 65% under -0.2 V bias. Meanwhile, the optimized PPDs also exhibit suppressed dark current of 3.9 nA, high responsivity (R) of over 0.4 A W-1, high specific detectivity (D*) of over 10(12) Jones in the near-infrared region under -0.2 V. Such highly sensitive broadband response PPDs, which can work well as self-powered conditions, offer great potential applications in multicolor light detection.