Journal
OPTICS COMMUNICATIONS
Volume 492, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optcom.2021.126945
Keywords
Density function theory; Linear and circular photogalvanic effects; Non-equilibrium Green's function; Photocurrent; Anisotropy; Bandgap
Categories
Funding
- National Natural Science Foundation of China [11564029]
- Natural Science Foundation of Inner Mongolia, China [2017MS0112]
- Science Foundation for Excellent Youth Scholars of Inner Mongolia University of Science and Technology, China [2017YQL06]
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Linear and circular photogalvanic effects in Janus monolayer In2SSe are studied using non-equilibrium Green's function technique. This material can generate a large photocurrent without external bias voltage when photon energy exceeds bandgap energy. Photocurrent changes with polarization angle and shows anisotropy in armchair and zigzag directions.
Linear and circular photogalvanic effects (PGEs) in Janus monolayer In2SSe are investigated by non-equilibrium Green's function technique and combined density functional theory. Janus monolayer In2SSe is a two-dimensional material having C-s symmetry with a reflective surface normal to the orientations of armchair and zigzag., In both the zigzag and armchair directions, linear and circular photogalvanic effects are induced by this symmetry. Our numerical results show that different from monolayer black phosphorus and antimonene, Janus monolayer In2SSe can generate a large photocurrent when the bandgap energy is surpassed by photon energy in the absence of external bias voltage. The photocurrent changes in perfect cosine form with the polarization angle, which can be attributed to the second-order response of polarized light electric field. There is obvious anisotropy in the zigzag and armchair directions. Under the condition of zero bias voltage, the photocurrent in the armchair direction is more robust, which is 15 times higher than that in the zigzag. All the results indicate that Janus monolayer In2SSe is a more suitable alternate material for solar cells in the range of visible light.
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