Microconcave MAPbBr3 Single Crystal for High-Performance Photodetector

Han Liu; Xiangfeng Wei; Zhixiang Zhang; Xunyong Lei; Wenchao Xu; Linbao Luo; Hualing Zeng; Ruifeng Lu; Jiehua Liu

doi:10.1021/acs.jpclett.9b00038

Microconcave MAPbBr₃ Single Crystal for High-Performance Photodetector

J Phys Chem Lett. 2019 Feb 21;10(4):786-792. doi: 10.1021/acs.jpclett.9b00038. Epub 2019 Feb 8.

Authors

Han Liu¹, Xiangfeng Wei¹, Zhixiang Zhang¹, Xunyong Lei², Wenchao Xu¹, Linbao Luo^{1

3}, Hualing Zeng², Ruifeng Lu⁴, Jiehua Liu^{1

3}

Affiliations

¹ Future Energy Laboratory, School of Materials Science and Engineering, School of Electronic Science and Applied Physics , Hefei University of Technology , Hefei 230009 , China.
² Hefei National Laboratory for Physical Sciences at Microscale , University of Science and Technology of China , Hefei 230026 , China.
³ Key Laboratory of Advanced Functional Materials and Devices of Anhui Province , Hefei 230009 , China.
⁴ School of Science , Nanjing University of Science and Technology , Nanjing 210094 , China.

PMID: 30724089
DOI: 10.1021/acs.jpclett.9b00038

Abstract

We present the first report of a new suspension method for obtaining cubic MAPbBr₃ single crystal with a concave surface. The cubic MAPbBr₃ crystal with microconcavity possesses good crystallinity and carrier lifetime. Excellent photoelectric performance was provided by the concavity-based MAPbBr₃ photodetectors because of the good light trapping and shortened carrier pathway. As a result, the concavity-based photodetector exhibits superior responsivity of 62.9 and 5.43 A W^-1 and EQE of 1.50 × 10⁴% and 1.30 × 10³% under low-power and high-power 520 nm irradiation of 3.67 μW cm^-2 and 35.4 mW cm^-2 at 3 V, respectively, which are more than 500% higher than those of the plane-based photodetector. In particular, the concavity-based photodetector has an ultrahigh detectivity of 6.5 × 10¹² Jones at ultralow power of 3.67 μW cm^-2, which is 6.5 times higher than that of the planar device.