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Gradient Energy Band Driven High‐Performance Self‐Powered Perovskite/CdS Photodetector
Author(s) -
Cao Fengren,
Meng Linxing,
Wang Meng,
Tian Wei,
Li Liang
Publication year - 2019
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.201806725
Subject(s) - photodetector , responsivity , materials science , optoelectronics , perovskite (structure) , nanorod , band bending , specific detectivity , doping , nanotechnology , chemical engineering , engineering
Self‐powered photodetectors are highly desired to meet the great demand in applications of sensing, communication, and imaging. Manipulating the carrier separation and recombination is critical to achieve high performance. In this paper, a self‐powered photodetector based on the integrated gradient O‐doped CdS nanorod array and perovskite is presented. Through optimizing the degree of continuous built‐in band bending in the gradient‐O CdS, the photodetector demonstrates a remarkable detectivity of 2.1 × 10 13 Jones. Under the self‐powered voltage mode, the responsivity can be as high as 0.48 A W −1 , and the rise and decay time are 0.54/2.21 ms. The comprehensive performance is comparable and even better than reported perovskite and other types of self‐powered photodetectors. The improved mechanism reveals that the gradient band bending promotes the photogenerated carrier transfer and hinders the recombination at the interface.