High-Performance Photodetectors Based on Lead-Free 2D Ruddlesden–Popper Perovskite/MoS2 Heterostructures

• DOI: 10.1021/acsami.8b20538
• Publication Date: 2019-01-31T15:11:19Z
• Authors: Chen Fang; Haizhen Wang; Zixi Shen; Hongzhi Shen; Shuai Wang; Jiaqi Ma; Jun Wang; Hongmei Luo; Dehui Li
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

Two-dimensional (2D) Ruddlesden-Popper perovskites have attracted great interest for their promising applications in high-performance optoelectronic devices owing to greatly tunable band gaps, layered characteristics, and better environmental stability over three-dimensional (3D) perovskites. Here, we the first time report on photodetectors based few-layer MoS2 (n-type) lead-free 2D perovskite (PEA)2SnI4 (p-type) heterostructures. The heterojunction device is capable of sensing light entire visible near-infrared wavelength range with a photoresponse peak. By using graphene flakes as electrical contact, performance heterostructures can be improved responsivity 1100 A/W at 3 V bias, fast response speed ∼40 ms under zero an excellent rectification ratio 500. Importantly, quantum efficiency achieve 38.2% which comparable or even higher than that 3D perovskite/2D material photodetectors. spectral peak heterojunctions gradually shifts wide from edge toward external bias. We believe these diversity represent interesting system investigating fundamental properties open up new pathway perovskite-based devices.