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Perovskite–Erbium Silicate Nanosheet Hybrid Waveguide Photodetectors at the Near‐Infrared Telecommunication Band
Author(s) -
Zhang Xuehong,
Yang Shuzhen,
Zhou Hong,
Liang Junwu,
Liu Huawei,
Xia Hui,
Zhu Xiaoli,
Jiang Ying,
Zhang Qinglin,
Hu Wei,
Zhuang Xiujuan,
Liu Hongjun,
Hu Weida,
Wang Xiao,
Pan Anlian
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201604431
Subject(s) - photodetector , photodetection , materials science , optoelectronics , responsivity , perovskite (structure) , photonics , erbium , infrared , silicon , nanosheet , optics , doping , nanotechnology , physics , chemical engineering , engineering
Methylammonium lead halide perovskites have attracted enormous attentions due to their superior optical and electronic properties. However, the photodetection at near‐infrared telecommunication wavelengths is hardly achievable because of their wide bandgaps. Here, this study demonstrates, for the first time, novel perovskite–erbium silicate nanosheet hybrid photodetectors with remarkable spectral response at ≈1.54 µm. Under the near‐infrared light illumination, the erbium silicate nanosheets can give strong upconversion luminescence, which will be well confined in their cavities and then be efficiently coupled into and simultaneously excite the adjacent perovskite to realize photodetection. These devices own prominent responsivity and external quantum efficiency as high as previously reported microscale silicon‐based subbandgap photodetectors. More importantly, the photoresponse speed (≈900 µs) is faster by five orders than the ever reported hot electron silicon‐based photodetectors at telecommunication wavelengths. The realization of perovskite‐based telecommunication band photodetectors will open new chances for applications in advanced integrated photonics devices and systems.