Ultrafast-programmable two-dimensional p–n homojunction for high-performance photovoltaics and optoelectronics

Author:

Wang Hao,Wu Kang,Guo Hui,Gao Hui,Liu Li,Wu Liangmei,Chen JiancuiORCID,Yang Haitao,Bao LihongORCID,Gao Hong-JunORCID

Abstract

Abstract Two-dimensional (2D) materials are considered to be promising candidates for constructing revolutionary electronic devices. However, difficulties in controlling the polarity, concentration, and spatial distribution of charge carriers in 2D materials make the construction of 2D p–n junctions rather challenging. Here, we report the successful construction of ultrafast-programmable 2D p–n homojunctions with a semi-floating-gate configuration based on a vertically stacked molybdenum disulfide (MoS2)/hexagonal boron nitride/multilayer graphene van der Waals heterostructure. By partially electrostatically doping the MoS2 channel under different control-gate voltage pulses, three types of 2D homojunctions, including p–n, n+–n, and n–n, can be constructed. The 2D p–n homojunction can be programmed at an ultrafast speed of within 160 ns and exhibits a large rectification ratio of ∼104. Based on a modified Shockley equation, an ideality factor of ∼2.05 is extracted, indicating that the recombination process dominated the transport mechanism. The MoS2 2D p–n homojunction shows a maximum electrical power conversion efficiency of up to 2.66% under a weak light power of 0.61 nW and a high photovoltage responsivity of 5.72 × 109 V W−1. These results indicate that the ultrafast-programmable 2D p–n homojunction has great potential for use in high-performance photovoltaics and optoelectronics.

Funder

National Natural Science Foundation of China

National Key Research & Development Projects of China

CAS Project for Young Scientists in Basic Research

Youth Innovation Promotion Association of the Chinese Academy of Sciences

Strategic Priority Research Program of Chinese Academy of Sciences

Publisher

IOP Publishing

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science,General Chemistry

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