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- Title
Band alignment and interlayer hybridization in monolayer organic/WSe<sub>2</sub> heterojunction.
- Authors
Guo, Yanping; Wu, Linlu; Deng, Jinghao; Zhou, Linwei; Jiang, Wei; Lu, Shuangzan; Huo, Da; Ji, Jiamin; Bai, Yusong; Lin, Xiaoyu; Zhang, Shunping; Xu, Hongxing; Ji, Wei; Zhang, Chendong
- Abstract
Semiconducting heterojunctions (HJs), comprised of atomically thin transition metal dichalcogenides (TMDs), have shown great potentials in electronic and optoelectronic applications. Organic/TMD hybrid bilayers hold enhanced pumping efficiency of interfacial excitons, tunable electronic structures and optical properties, and other superior advantages to these inorganic HJs. Here, we report a direct probe of the interfacial electronic structures of a crystalline monolayer (ML) perylene-3,4,9,10-tetracarboxylic-dianhydride (PTCDA)/ML-WSe2 HJ using scanning tunneling microscopy, photoluminescence, and first-principle calculations. Strong PTCDA/WSe2 interfacial interactions lead to appreciable hybridization of the WSe2 conduction band with PTCDA unoccupied states, accompanying with a significant amount of PTCDA-to-WSe2 charge transfer (by 0.06 e/PTCDA). A type-II band alignment was directly determined with a valence band offset of ∼ 1.69 eV, and an apparent conduction band offset of ∼ 1.57 eV. Moreover, we found that the local stacking geometry at the HJ interface differentiates the hybridized interfacial states.
- Publication
Nano Research, 2022, Vol 15, Issue 2, p1276
- ISSN
1998-0124
- Publication type
Article
- DOI
10.1007/s12274-021-3648-9