High efficiency and fast van der Waals hetero-photodiodes with a unilateral depletion region

Feng Wu, Qing Li, Peng Wang (), Hui Xia, Zhen Wang, Yang Wang, Man Luo, Long Chen, Fansheng Chen, Jinshui Miao, Xiaoshuang Chen, Wei Lu, Chongxin Shan, Anlian Pan, Xing Wu (), Wencai Ren, Deep Jariwala and Weida Hu ()
Additional contact information
Feng Wu: Chinese Academy of Sciences
Qing Li: Chinese Academy of Sciences
Peng Wang: Chinese Academy of Sciences
Hui Xia: Chinese Academy of Sciences
Zhen Wang: Chinese Academy of Sciences
Yang Wang: Chinese Academy of Sciences
Man Luo: Chinese Academy of Sciences
Long Chen: Chinese Academy of Sciences
Fansheng Chen: Chinese Academy of Sciences
Jinshui Miao: Chinese Academy of Sciences
Xiaoshuang Chen: Chinese Academy of Sciences
Wei Lu: Chinese Academy of Sciences
Chongxin Shan: Zhengzhou University
Anlian Pan: Hunan University
Xing Wu: East China Normal University
Wencai Ren: Chinese Academy of Sciences
Deep Jariwala: University of Pennsylvania
Weida Hu: Chinese Academy of Sciences

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Van der Waals (vdW) heterodiodes based on two-dimensional (2D) materials have shown tremendous potential in photovoltaic detectors and solar cells. However, such 2D photovoltaic devices are limited by low quantum efficiencies due to the severe interface recombination and the inefficient contacts. Here, we report an efficient MoS2/AsP vdW hetero-photodiode utilizing a unilateral depletion region band design and a narrow bandgap AsP as an effective carrier selective contact. The unilateral depletion region is verified via both the Fermi level and the infrared response measurements. The device demonstrates a pronounced photovoltaic behavior with a short-circuit current of 1.3 μA and a large open-circuit voltage of 0.61 V under visible light illumination. Especially, a high external quantum efficiency of 71%, a record high power conversion efficiency of 9% and a fast response time of 9 μs are achieved. Our work suggests an effective scheme to design high-performance photovoltaic devices assembled by 2D materials.

Date: 2019
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DOI: 10.1038/s41467-019-12707-3

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