Journal
ACS NANO
Volume 7, Issue 5, Pages 4070-4081Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn4001963
Keywords
graphene; [6,6)-phenyl-C61-butyric acid methyl ester (PCBM); pyrene; electron extraction layer; polymer solar cells
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Funding
- National Basic Research Program of China [201008923300, 2011CB921400]
- National Natural Science Foundation of China [90921013, 21132007]
- 100 Talents Programme of CAS from Chinese Academy of Sciences
- Fundamental Research Funds for the Central Universities [WK2060140005]
- Key Laboratory of Novel Thin Film Solar Cells [KF201103]
- Chinese Academy of Sciences, and Specialized Research Fund for the Doctoral Program of Higher Education [20113402110020]
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A new graphene-fullerene composite (rGO-pyrene-PCBM), in which [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) was attached onto reduced graphene oxide (rGO) via the noncovalent functionalization approach, was reported. The pyrene-PCBM moiety was synthesized via a facile esterification reaction, and pyrene was used as an anchoring bridge to link rGO and PCBM components. FTIR, UV-vis, and XPS spectroscopic characterizations were carried out to confirm the hybrid structure of rGO-pyrene-PCBM, and the composite formation is found to improve greatly the dispersity of rGO in DMF. The geometric configuration of rGO-pyrene-PCBM was studied by Raman, SEM, and AFM analyses, suggesting that the C-60 moiety is far from the graphene sheet and is bridged with the graphene sheet via the pyrene anchor. Finally rGO-pyrene-PCBM was successfully applied as electron extraction layer for P3HT:PCBM bulk heterojunction polymer solar cell (BHJ-PSC) devices, affording a PCE of 3.89%, which is enhanced by ca. 15% compared to that of the reference device without electron extraction layer (3.39%). Contrarily, the comparative devices Incorporating the rGO or pyrene-PCBM component as electron extraction layer showed dramatically decreased PCE, indicating the importance of composite formation between rGO and pyrene-PCBM components for its electron extraction property.
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