Ultrafast Charge Transfer in Perovskite Nanowire/2D Transition Metal Dichalcogenide Heterostructures

Qiyi Fang; Qiuyu Shang; Liyun Zhao; Rui Wang; Zhepeng Zhang; Pengfei Yang; Xinyu Sui; Xiaohui Qiu; Xinfeng Liu; Qing Zhang; Yanfeng Zhang

doi:10.1021/acs.jpclett.8b00260

Ultrafast Charge Transfer in Perovskite Nanowire/2D Transition Metal Dichalcogenide Heterostructures

J Phys Chem Lett. 2018 Apr 5;9(7):1655-1662. doi: 10.1021/acs.jpclett.8b00260. Epub 2018 Mar 19.

Authors

Qiyi Fang^{1

2}, Qiuyu Shang^{1

3}, Liyun Zhao¹, Rui Wang⁴, Zhepeng Zhang^{1

2}, Pengfei Yang^{1

2}, Xinyu Sui⁴, Xiaohui Qiu⁴, Xinfeng Liu⁴, Qing Zhang^{1

3}, Yanfeng Zhang^{1

2}

Affiliations

¹ Department of Materials Science and Engineering , College of Engineering, Peking University , Beijing 100871 , People's Republic of China.
² Center for Nanochemistry (CNC), Beijing National Laboratory for Molecular Sciences , College of Chemistry and Molecular Engineering, Peking University , Beijing 100871 , People's Republic of China.
³ Research Center for Wide Gap Semiconductor , Peking University , Beijing 100871 , People's Republic of China.
⁴ CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience , National Center for Nanoscience and Technology , Beijing 100190 , People's Republic of China.

PMID: 29533623
DOI: 10.1021/acs.jpclett.8b00260

Abstract

Mixed-dimensional van der Waals (vdW) heterostructures between one-dimensional (1D) perovskite nanowires and two-dimensional (2D) transition metal dichalcogenides (TMDCs) hold great potential for novel optoelectronics and light-harvesting applications. However, the ultrafast carrier dynamics between the 1D perovskite nanowires and 2D TMDCs are currently not well understood, which is critical for related optoelectronic applications. Here we demonstrate vdW heterostructures of CsPbBr₃ nanowire/monolayer MoS₂ and CsPbBr₃ nanowire/monolayer WSe₂ and further present systematic investigations on their charge transfer dynamics. We show that CsPbBr₃/MoS₂ and CsPbBr₃/WSe₂ are type-I and type-II heterostructures, respectively. Both electrons and holes transfer from CsPbBr₃ to MoS₂ with an efficiency of 71%. As a contrast, holes transfer from CsPbBr₃ to WSe₂ with a carrier transfer efficiency of 70% and electrons transfer inversely within 7 ps. The ultrafast and efficient charge transfer in the 1D/2D perovskite-TMDC heterostructures suggest great promise in light emission, photodetector, and photovoltaic devices.