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Cu/graphene hybrid transparent conducting electrodes for organic photovoltaic devices

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Abstract
Cu/graphene hybrid films which function as both p-type and n-type transparent conducting electrodes were utilized in conventional and inverted organic solar cells. The value of sheet resistance decreased to ∼75 Ω/sq for Cu/graphene hybrid films with an optimum thickness of 7 nm of Cu, which constitutes a dramatic improvement compared to graphene alone (∼180 Ω/sq). Meanwhile, the work functions of the Cu/graphene hybrid electrodes can also be controlled through the range of 4.84?4.95 eV by changing the amount of Cu which was thermally deposited on top of the graphene layer. In addition, the Cu/graphene films showed wrinkle features with the root-mean-square (RMS) roughness ranging from 1.9?5.8 nm and RMS currents are nearly doubled as a function of the thickness of Cu deposition (∼30 nA) by using atomic force microscope (AFM) and conductive-AFM (C-AFM) measurements. Conventional and inverted organic solar cells with 3 nm Cu/graphene hybrid electrodes showed 1.4 and 4.5 times larger power conversion efficiencies (PCE), respectively, than those of the devices with pristine graphene electrodes.
Author(s)
Ju Hwan KangSukyung ChoiYu Jung ParkJin Sung ParkNam Sung Cho조신욱Jung Hwa SeoBright WalkerDong Soo ChoiJin-Wook Shin
Issued Date
2021
Type
Article
Keyword
GrapheneCopperTransparent electrodeSolar cell
DOI
10.1016/j.carbon.2020.08.055
URI
https://oak.ulsan.ac.kr/handle/2021.oak/8955
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_gale_infotracacademiconefile_A663047292&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Cu%2Fgraphene%20hybrid%20transparent%20conducting%20electrodes%20for%20organic%20photovoltaic%20devices&offset=0&pcAvailability=true
Publisher
CARBON
Location
영국
Language
영어
ISSN
0008-6223
Citation Volume
171
Citation Number
1
Citation Start Page
341
Citation End Page
349
Appears in Collections:
Engineering > Material Engineering
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