Continuous, Highly Flexible, and Transparent Graphene Films by Chemical Vapor Deposition for Organic Photovoltaics

被引：1026

作者：

De Arco, Lewis Gomez ^{[1
,2
]}

Zhang, Yi ^{[1
,2
]}

Schlenker, Cody W. ^{[2
]}

Ryu, Koungmin ^{[1
]}

Thompson, Mark E. ^{[2
]}

Zhou, Chongwu ^{[1
]}

机构：

[1] Univ So Calif, Dept Elect Engn, Los Angeles, CA 90089 USA

[2] Univ So Calif, Dept Chem, Los Angeles, CA 90089 USA

来源：

ACS NANO | 2010年 / 4卷 / 05期

基金：

美国国家科学基金会;

关键词：

graphene; chemical vapor deposition; transparent conductor; flexible photovoltaics; flexible solar cell; organic photovoltaics; transparent electrode; INDIUM TIN OXIDE; CARBON; ELECTRODES; SERIES; DIODE; ROUTE;

D O I：

10.1021/nn901587x

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report the implementation of continuous, highly flexible, and transparent graphene films obtained by chemical vapor deposition (CVD) as transparent conductive electrodes (TCE) in organic photovoltaic cells. Graphene films were synthesized by CVD, transferred to transparent substrates, and evaluated in organic solar cell heterojunctions (TCE/poly-3,4-ethylenedioxythiophene:poly styrenesulfonate (PEDOT:PSS)/copper phthalocyanine/fullerene/bathocuproine/aluminum). Key to our success is the continuous nature of the CVD graphene films, which led to minimal surface roughness (similar to 0.9 nm) and offered sheet resistance down to 230 Omega/sq (at 72% transparency), much lower than stacked graphene flakes at similar transparency. In addition, solar cells with CVD graphene and indium tin oxide (ITO) electrodes were fabricated side-by-side on flexible polyethylene terephthalate (PET) substrates and were confirmed to offer comparable performance, with power conversion efficiencies (eta) of 1.18 and 1.27%, respectively. Furthermore, CVD graphene solar cells demonstrated outstanding capability to operate under bending conditions up to 138 degrees, whereas the ITO-based devices displayed cracks and irreversible failure under bending of 60 degrees. Our work indicates the great potential of CVD graphene films for flexible photovoltaic applications.

引用

页码：2865 / 2873

页数：9

共 40 条

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