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Efficient and Layer‐Dependent Exciton Pumping across Atomically Thin Organic–Inorganic Type‐I Heterostructures
Author(s) -
Zhang Linglong,
Sharma Ankur,
Zhu Yi,
Zhang Yuhan,
Wang Bowen,
Dong Miheng,
Nguyen Hieu T.,
Wang Zhu,
Wen Bo,
Cao Yujie,
Liu Boqing,
Sun Xueqian,
Yang Jiong,
Li Ziyuan,
Kar Arara,
Shi Yi,
Macdonald Daniel,
Yu Zongfu,
Wang Xinran,
Lu Yuerui
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201803986
Subject(s) - materials science , heterojunction , pentacene , exciton , monolayer , photoexcitation , optoelectronics , thin film , layer (electronics) , nanotechnology , condensed matter physics , excitation , thin film transistor , physics , engineering , electrical engineering
The fundamental light–matter interactions in monolayer transition metal dichalcogenides might be significantly engineered by hybridization with their organic counterparts, enabling intriguing optoelectronic applications. Here, atomically thin organic–inorganic (O–I) heterostructures, comprising monolayer MoSe 2 and mono‐/few‐layer single‐crystal pentacene samples, are fabricated. These heterostructures show type‐I band alignments, allowing efficient and layer‐dependent exciton pumping across the O–I interfaces. The interfacial exciton pumping has much higher efficiency (>86 times) than the photoexcitation process in MoSe 2 , although the pentacene layer has much lower optical absorption than MoSe 2 . This highly enhanced pumping efficiency is attributed to the high quantum yield in pentacene and the ultrafast energy transfer between the O–I interface. Furthermore, those organic counterparts significantly modulate the bindings of charged excitons in monolayer MoSe 2 via their precise dielectric environment engineering. The results open new avenues for exploring fundamental phenomena and novel optoelectronic applications using atomically thin O–I heterostructures.

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