Spatial Electrode Modulation Strategy for the Perovskite Single Crystal Photodetector

作者：Yazhou Yang, Yuankai Song, Jiayi Li, Zhenglan Ye, Dan Chen, Qinxing Huang, Yupeng Zhu, Congwei Shi, Xiangquan Liu, Guangze Zhang, Tao Men, Yuhua Zuo, Jun Zheng, Lei Zhao, Chunlan Zhou, Zhi Liu, Buwen Cheng · 发表于：ACS Photonics · 年份：2024 · DOI：10.1021/acsphotonics.4c01087 · 被引用次数：7 · 研究领域：Perovskite Materials and Applications、Advanced Semiconductor Detectors and Materials、Electronic and Structural Properties of Oxides

Perovskite meets the diverse needs of photodetectors (PDs) with excellent material properties and wealth of tuning capabilities. Herein, proposed by the spatial electrode modulation strategy, two kinds of perovskite PDs were designed and fabricated, which can modulate the detection bands and enhance the spectrum response greatly. For the light window electrode perovskite PDs, the asymmetric electric field can enhance the carrier collection efficiency and unravel the trade-off between high response and narrowband of PDs, exhibiting both high spectral selectivity (full width at half-maximum <14 nm) and high external quantum efficiency (EQE) of 78.5% at 570 nm. For the dot electrode structure PDs, broadband detection is achieved, attributing to the local electric field enhancement effect, achieving extra avalanche gain with a high EQE of 300% and faster response time of about 42 μs. Furthermore, we developed a packaging process for perovskite devices that enables their direct use in a humid environment. The proposed spatial electrode modulation strategy introduces a novel design paradigm for perovskite optoelectronic devices, paving the way for broader applications.