Narrowband photodetector (NB-PD) with selective light detection is critical for artificial vision and imaging. Intrinsic (optical-filter-free) NB-PDs using conjugated organics or halide perovskite materials have been developed for eliminating the current complex filtering systems in NB-PDs. However, the poor performance and external driving circuit of organic NB-PDs as well as complex doping and uncontrollable recombination reactions in typical perovskite NB-PDs have limited their applicational diversification. A p-type self-doped perovskite for intrinsic NB detection is reported which exhibits unique unbalanced electron–hole transfer kinetics. In conjunction with the optical field distribution, an unbalanced charge transport within the self-doped perovskite triggers a wavelength-dependent photo-carrier collection, resulting in a novel spontaneous internal quantum efficiency narrowing mechanism. As a result, by reverting the device architectural polarity, an NB detection at a monochromic light of either red or UV is observed. Using such a revertible asymmetric device design, self-powered NB-PDs are successfully achieved. Briefly, the corresponding NB-PDs exhibit excellent narrow response with a response window of ≈100 nm, high detectivity ≈1011 Jones, and fast response speed (f−3dB ≈ 60 kHz) at zero bias. These results demonstrate a new strategy of manipulating internal charge transport to realize power-free and filter-free intrinsic NB-PDs.
Bibliographical noteFunding Information:
Y.H. would like to thank Lujin Min and Haoyang Leng for the helpful discussions on data interpretation. K.W. would like to thank Prof. Xiong Gong from The University of Akron for constructive discussions and suggestions on the device physics of PD. S.P. and K.W. acknowledges the support through the AFOSR Biophysics program (FA9550‐20‐1‐0157) and IEE Stewardship Seed Grant Program. T.Y. acknowledges the partial support through NIFA award number 2019‐67021‐28991. D.Y. acknowledges the support through the National Science Foundation through the award number 1936432. Y.H. acknowledges the partial support through the Air Force Office of Scientific Research under award number: FA9550‐17‐1‐0341. J.Y. acknowledges support from the Office of Naval Research through award number N000141912461.
© 2020 Wiley-VCH GmbH
- narrowband photodetection
- Red/UV recognition
- unbalanced electron/hole transport