Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 9, Issue 7, Pages 1655-1662Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.8b00260
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Funding
- Ministry of Science and Technology [2017YFA0205700, 2017YFA0304600, 2016YFA0200700, 2017YFA0205004]
- National Natural Science Foundation of China [51290272, 51472008, 61774003, 61521004, 21673054]
- Peking University
- 1000 Talent Programs from the Chinese government
- Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics [KF201601, KF201604]
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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.
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