Layer-by-Layer Graphene/TCNQ Stacked Films as Conducting Anodes for Organic Solar Cells
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- 作者：Chang-Lung Hsu ; Cheng-Te Lin ; Jen-Hsien Huang ; Chih-Wei Chu ; Kung-Hwa Wei ; Lain-Jong Li
- 刊名：ACS Nano
- 出版年：2012
- 出版时间：June 26, 2012
- 年：2012
- 卷：6
- 期：6
- 页码：5031-5039
- 全文大小：488K
- 年卷期：v.6,no.6(June 26, 2012)
- ISSN：1936-086X
文摘
Large-area graphene grown by chemical vapor deposition (CVD) is a promising candidate for transparent conducting electrode applications in flexible optoelectronic devices such as light-emitting diodes or organic solar cells. However, the power conversion efficiency (PCE) of the polymer photovoltaic devices using a pristine CVD graphene anode is still not appealing due to its much lower conductivity than that of conventional indium tin oxide. We report a layer-by-layer molecular doping process on graphene for forming sandwiched graphene/tetracyanoquinodimethane (TCNQ)/graphene stacked films for polymer solar cell anodes, where the TCNQ molecules (as p-dopants) were securely embedded between two graphene layers. Poly(3-hexylthiophene)/phenyl-C61-butyric acid methyl ester (P3HT/PCBM) bulk heterojunction polymer solar cells based on these multilayered graphene/TCNQ anodes are fabricated and characterized. The P3HT/PCBM device with an anode structure composed of two TCNQ layers sandwiched by three CVD graphene layers shows optimum PCE (2.58%), which makes the proposed anode film quite attractive for next-generation flexible devices demanding high conductivity and transparency.