Strong optical response and light emission from a monolayer molecular crystal

Zhao, Huijuan; Zhao, Yingbo; Song, Yinxuan; Zhou, Ming; Lv, Wei; Tao, Liu; Feng, Yuzhang; Song, Biying; Ma, Yue; Zhang, Junqing; Xiao, Jun; Wang, Ying; Lien, Der-Hsien; Amani, Matin; Kim, Hyungjin; Chen, Xiaoqing; Wu, Zhangting; Ni, Zhenhua; Wang, Peng; Shi, Yi; Ma, Haibo; Zhang, Xiang; Xu, Jian-Bin; Troisi, Alessandro; Javey, Ali; Wang, Xinran

doi:10.1038/s41467-019-13581-9

Title: Strong optical response and light emission from a monolayer molecular crystal

Journal Article · 05 December 2019 · Nature Communications

DOI: https://doi.org/10.1038/s41467-019-13581-9 · OSTI ID:1582356

Zhao, Huijuan ^[1]; Zhao, Yingbo ^[2]; Song, Yinxuan ^[1];

^[3]; Lv, Wei ^[1]; Tao, Liu ^[1]; Feng, Yuzhang ^[1]; Song, Biying ^[1]; Ma, Yue ^[1]; Zhang, Junqing ^[1]; Xiao, Jun ^[4]; Wang, Ying ^[4]; Lien, Der-Hsien ^[2]; Amani, Matin ^[2]; Kim, Hyungjin ^[2]; Chen, Xiaoqing ^[5]; Wu, Zhangting ^[6]; Ni, Zhenhua ^[6];

^[1];

^[1] more »

Nanjing Univ. (China)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of Wisconsin, Madison, WI (United States)
Univ. of California, Berkeley, CA (United States). National Science Foundation (NSF) Nanoscale Science and Engineering Center
Nanjing Univ. (China); Xidian Univ., Xian (China)
Southeast Univ., Nanjing (China)
Chinese Univ. of Hong Kong (China)
Univ. of Liverpool (United Kingdom)

Excitons in two-dimensional (2D) materials are tightly bound and exhibit rich physics. So far, the optical excitations in 2D semiconductors are dominated by Wannier-Mott excitons, but molecular systems can host Frenkel excitons (FE) with unique properties. Here, we report a strong optical response in a class of monolayer molecular J-aggregates. The exciton exhibits giant oscillator strength and absorption (over 30% for monolayer) at resonance, as well as photoluminescence quantum yield in the range of 60-100%. We observe evidence of superradiance (including increased oscillator strength, bathochromic shift, reduced linewidth and lifetime) at room-temperature and more progressively towards low temperature. These unique properties only exist in monolayer owing to the large unscreened dipole interactions and suppression of charge-transfer processes. Finally, we demonstrate light-emitting devices with the monolayer J-aggregate. The intrinsic device speed could be beyond 30 GHz, which is promising for next-generation ultrafast on-chip optical communications.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: National Natural Science Foundation of China (NSFC); Chinese Academy of Sciences (CAS); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1582356

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 10; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Probing Carrier Transport and Structure-property Relationship of Highly Ordered Organic Semiconductors at Two-dimensional Limit Zhang, Yuhan; Qiao, Jingsi; Gao, Si arXiv https://doi.org/10.48550/arxiv.1601.01893	text	January 2016
Electrical suppression of all nonradiative recombination pathways in monolayer semiconductors Lien, Der-Hsien; Uddin, Shiekh Zia; Yeh, Matthew arXiv https://doi.org/10.48550/arxiv.1905.03365	text	January 2019

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