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학술지 Cu/graphene Hybrid Transparent Conducting Electrodes for Organic Photovoltaic Devices
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저자
강주환, 최수경, 박유정, 박진성, 조남성, 조신욱, Bright Walker, 최동수, 신진욱, 서정화
발행일
202101
출처
Carbon, v.171, pp.341-349
ISSN
0008-6223
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.carbon.2020.08.055
협약과제
20ZB1200, ICT 소재·부품·장비 자립기술 및 도전기술 개발, 이정익
초록
© 2020 Elsevier Ltd 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 廓/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 廓/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.
키워드
Copper, Graphene, Solar cell, Transparent electrode
KSP 제안 키워드
Atomic force microscope(AFM), Conversion efficiency(C.E.), Cu deposition, Graphene hybrid, Graphene layer, Hybrid electrode, Hybrid films, Optimum thickness, Organic photovoltaics(OPVs), P-type and N-type, Pristine graphene