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Highly Sensitive Low‐Bandgap Perovskite Photodetectors with Response from Ultraviolet to the Near‐Infrared Region
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2017-09-13 , DOI: 10.1002/adfm.201703953 Wenbin Wang 1 , Dewei Zhao 2 , Fujun Zhang 1 , Ludong Li 3 , Mingde Du 4 , Changlei Wang 2 , Yue Yu 2 , Qianqian Huang 2 , Miao Zhang 1 , Lingliang Li 1 , Jianli Miao 1 , Zheng Lou 3 , Guozhen Shen 3 , Ying Fang 4 , Yanfa Yan 2
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2017-09-13 , DOI: 10.1002/adfm.201703953 Wenbin Wang 1 , Dewei Zhao 2 , Fujun Zhang 1 , Ludong Li 3 , Mingde Du 4 , Changlei Wang 2 , Yue Yu 2 , Qianqian Huang 2 , Miao Zhang 1 , Lingliang Li 1 , Jianli Miao 1 , Zheng Lou 3 , Guozhen Shen 3 , Ying Fang 4 , Yanfa Yan 2
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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 (≈1.25 eV) (FASnI3)0.6(MAPbI3)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 C60 layers. The optimized PPDs with 1000 nm thick perovskite layer and 70 nm thick C60 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 1012 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.
中文翻译：
高灵敏度低带隙钙钛矿光电探测器，具有从紫外线到近红外区域的响应
由于最常用的甲基铵卤化铅铅钙钛矿的带隙相对较大，因此获得宽带响应钙钛矿光电探测器（PPD）面临着巨大挑战。报告的PPD的响应范围仅限于紫外线可见范围内。在这里，成功制备了具有低带隙（≈1.25eV）（FASnI 3）0.6（MAPbI 3）0.4钙钛矿作为活性层的高灵敏度PPD ，表现出300至1000 nm的宽带响应。可以通过调整钙钛矿层和C 60层的厚度来优化PPD的性能。具有1000纳米厚钙钛矿层和70纳米厚C 60的优化PPD在-0.2 V偏置下，EQE层在350至900 nm范围内具有几乎平坦的外部量子效率（EQE）光谱，且EQE大于65％。同时，优化的PPD在-0.2 V下的近红外区域还表现出3.9 nA的抑制暗电流，超过0.4 AW -1的高响应度（R），超过10 12 Jones的高比探测度（D *）。高灵敏度宽带响应PPD可以在自供电条件下很好地工作，在多色光检测中提供了巨大的潜在应用。
更新日期：2017-09-13
中文翻译：
高灵敏度低带隙钙钛矿光电探测器，具有从紫外线到近红外区域的响应
由于最常用的甲基铵卤化铅铅钙钛矿的带隙相对较大，因此获得宽带响应钙钛矿光电探测器（PPD）面临着巨大挑战。报告的PPD的响应范围仅限于紫外线可见范围内。在这里，成功制备了具有低带隙（≈1.25eV）（FASnI 3）0.6（MAPbI 3）0.4钙钛矿作为活性层的高灵敏度PPD ，表现出300至1000 nm的宽带响应。可以通过调整钙钛矿层和C 60层的厚度来优化PPD的性能。具有1000纳米厚钙钛矿层和70纳米厚C 60的优化PPD在-0.2 V偏置下，EQE层在350至900 nm范围内具有几乎平坦的外部量子效率（EQE）光谱，且EQE大于65％。同时，优化的PPD在-0.2 V下的近红外区域还表现出3.9 nA的抑制暗电流，超过0.4 AW -1的高响应度（R），超过10 12 Jones的高比探测度（D *）。高灵敏度宽带响应PPD可以在自供电条件下很好地工作，在多色光检测中提供了巨大的潜在应用。
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