激子
异质结
材料科学
轨道能级差
化学物理
光致发光
凝聚态物理
比克西顿
范德瓦尔斯力
化学
光电子学
物理
分子
有机化学
作者
S. Fu,Jing Ding,Haifeng Lv,Shuangyan Liu,Ke Zhao,Zhiying Bai,Dalin He,Rui Wang,Jianlin Zhao,Xiaojun Wu,Dongsheng Tang,Xiaohui Qiu,Yongsheng Wang,Xiaoxian Zhang
出处
期刊:Cornell University - arXiv
日期:2023-01-06
标识
DOI:10.48550/arxiv.2301.02523
摘要
The coherent many-body interaction at the organic-inorganic interface can give rise to intriguing hybrid excitons that combine the advantages of the Wannier-Mott and Frenkel excitons simultaneously. Unlike the 2D inorganic heterostructures that suffer from moment mismatch, the hybrid excitons formed at the organic-inorganic interface have a momentum-direct nature, which have yet to be explored. Here, we report hybrid excitons at the copper phthalocyanine/molybdenum diselenide (CuPc/MoSe2) interface with strong molecular orientation dependence using low-temperature photoluminescence spectroscopy. The new emission peaks observed in the CuPc/MoSe2 heterostructure indicate the formation of interfacial hybrid excitons. The density functional theory (DFT) calculation confirms the strong hybridization between the lowest unoccupied molecular orbital (LUMO) of CuPc and the conduction band minimum (CBM) of MoSe2, suggesting that the hybrid excitons consist of electrons extended in both layers and holes confined in individual layers. The temperature-dependent measurements show that the hybrid excitons can gain the signatures of the Frenkel excitons of CuPc and the Wannier-Mott excitons of MoSe2 simultaneously. The out-of-plane molecular orientation is used to tailor the interfacial hybrid exciton states. Our results reveal the hybrid excitons at the CuPc/MoSe2 interface with tunability by molecular orientation, which suggests that the emerging organic-inorganic heterostructure can be a promising platform for many-body exciton physics.
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