Two-Dimensional Semiconductor Heterojunctions for Optoelectronics and Electronics

FRONTIERS IN ENERGY RESEARCH(2021)

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Abstract
Two-dimensional (2D) layered semiconductors are current research hotspots on account of their wide variety of applications in electronics and optoelectronics due to their particular ultrathin nature. In this review, the band alignment engineering in heterojunctions composed of 2D van der Waals (vdW) layered semiconductors and their device applications in optoelectronics are provided. Various approaches that induced adjustability of vdW heterojunctions are summarized, mainly including composition and thickness modulations, strain, and electric fields. Furthermore, their perspectives on future developments in optoelectronics and electronics devices based on the newly unique physical and chemical properties are outlined.
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Key words
2D semiconductor heterojunction, band alignment, strain, electric field, optoelectronics
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