Self-Powered Perovskite/CdS Heterostructure Photodetectors.

Zibo Li, Henan Li, Ke Jiang, Dong Ding, Jieni Li, Chun Ma, Shangchi Jiang, Ye Wang, Thomas D. Anthopoulos, Yumeng Shi

Research output: Contribution to journalArticlepeer-review

65 Scopus citations


Methylammonium lead halide perovskites have gained a lot of attention because of their remarkable physical properties and potential for numerous (opto)electronic applications. Here, high-performance photodetectors based on CH3NH3PbI3 (MAPbI3)/CdS heterostructures are demonstrated. The resulting self-powered MAPbI3/CdS photodetectors show excellent operating characteristics including a maximum detectivity of 2.3 × 1011 Jones with a responsivity of 0.43 A/W measured at 730 nm. A temporal response time of less than 14 ms was achieved. The mechanisms of charge separation and transport at the interface of the MAPbI3/CdS junction were investigated via conductive atomic force microscopy (AFM) and photoconductive AFM. Obtained results show that grain boundaries exhibit higher photocurrent than flat regions of the top perovskite layer, which indicates that excitons preferentially separate at the grain boundaries of the perovskite thin film, that is, at the edges of the MAPbI3 crystals. The study of the photoelectric mechanism at the nanoscale suggests the device performance could potentially be fine-tuned through grain boundary engineering, which provides essential insights for the fabrication of the high-performance photodetector. The demonstrated self-powered photodetector is promising for numerous applications in low-energy consumption optoelectronic devices.
Original languageEnglish (US)
Pages (from-to)40204-40213
Number of pages10
JournalACS Applied Materials & Interfaces
Issue number43
StatePublished - Oct 11 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: We acknowledge the support from the Science and Technology Innovation Commission of Shenzhen (JCYJ20170817100111548, JCYJ20170817101100705, ZDSYS201707271014468); the National Natural Science Foundation of China (grant nos. 51602200, 61874074, 21603192) and the (Key) Project of Department of Education of Guangdong Province (grant no. 2016KZDXM008). This project was partially supported by Shenzhen Peacock Plan (grant no. KQTD2016053112042971). T.D.A. and C.M. are grateful to King Abdullah University of Science and Technology (KAUST) for financial support.


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