Abstract
Abstract
Based on density functional theory calculations and non-equilibrium Green’s function method, we study the photovoltaic effect of monolayer MoSe2–WS2 lateral heterojunction under vertical irradiation. Combined with the differential charge density, it predicts the stability of the MoSe2–WS2 heterojunction and the high possibility of charge transfer from MoSe2 to WS2. As a result, such MoSe2–WS2 lateral heterojunction breaks the spatial inversion symmetry thus leading to a photocurrent. The resultant photocurrent increases from close to zero to a maximum value in the range of photon energy of 1.7 eV–2.8 eV. The photocurrent response fits the cosine function with respect to the polarization angle. The peak photocurrent is obtained when the photon energy is 2.8 eV, and can be attributable to the large density state peaks near −1.3 eV in the valence band and 1.5 eV in the conduction band. Meanwhile, the single-layer MoSe2–WS2 lateral heterojunction exhibits higher polarization sensitivity that is characterized by an extinction ratio of up to 9.6. These results suggest possible applications of the single-layer MoSe2–WS2 lateral heterojunction in next generation optoelectronic devices.
Funder
National Key Research and Development Program
Ministry of Education
the Program of Qingjiang Excellent Young Talents, Jiangxi University of Science and Technology
National Natural Science Foundation of China
Key Laboratory of Special Artificial Microstructure Materials
MOE
NUS
Subject
Surfaces, Coatings and Films,Acoustics and Ultrasonics,Condensed Matter Physics,Electronic, Optical and Magnetic Materials
Cited by
7 articles.
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