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Decelerated Hot Carrier Cooling in Graphene via Nondissipative Carrier Injection from MoS2

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Title
Decelerated Hot Carrier Cooling in Graphene via Nondissipative Carrier Injection from MoS2
Author(s)
Minh Dao Tran; Sung-Gyu Lee; Sunam Jeon; Sung-Tae Kim; Hyun Kim; Van Luan Nguyen; Subash Adhikari; Sungjong Woo; Hee Chul Park; Youngkuk Kim; Ji-Hee Kim; Young Hee Lee
Publication Date
2020-10
Journal
ACS NANO, v.14, no.10, pp.13905 - 13912
Publisher
AMER CHEMICAL SOC
Abstract
One key to improve the performance of advanced optoelectronic devices and energy harvesting in graphene is to understand the predominant carrier scattering via optical phonons. Nevertheless, low light absorbance in graphene yields a limited photoexcited carrier density, hampering the hot carrier effect, which is strongly correlated to the hot optical phonon bottleneck effect as the energy-loss channel. Here, by integrating graphene with monolayer MoS2 possessing stronger light absorbance, we demonstrate an efficient interfacial hot carrier transfer between graphene and MoS2 in their heterostructure with a prolonged relaxation time using broadband transient differential transmittance spectroscopy. We observe that the carrier relaxation time of graphene in the heterostructure is 4 times slower than that of bare graphene. This is explained by nondissipative interlayer transfer from MoS2 to graphene, which is attributed to the enhanced hot optical phonon bottleneck effect of graphene in the heterostructure by an increased photoexcited carrier population. A significant reduction of both amplitude and relaxation time in A- and B-excitons is another evidence of the interlayer transfer from MoS2 to graphene. The nondissipative interlayer charge transfer from MoS2 to graphene is confirmed by density functional calculations. This provides a different platform to further study the photoinduced hot carrier effect in graphene heterostructures for photothermoelectric detectors or hot carrier solar cells.
URI
https://pr.ibs.re.kr/handle/8788114/7605
DOI
10.1021/acsnano.0c06311
ISSN
1936-0851
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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