Noncovalent Functionalization of Graphene Attaching [6,6]-Phenyl-C61-butyric Acid Methyl Ester (PCBM) and Application as Electron Extraction Layer of Polymer Solar Cells

详细信息    查看全文

• 作者：Shuxuan Qu ; Minghua Li ; Lixin Xie ; Xiao Huang ; Jinguo Yang ; Nan Wang ; Shangfeng Yang
• 刊名：ACS Nano
• 出版年：2013
• 出版时间：May 28, 2013
• 年：2013
• 卷：7
• 期：5
• 页码：4070-4081
• 全文大小：776K
• 年卷期：v.7,no.5(May 28, 2013)
• ISSN：1936-086X

文摘

A new graphene鈥揻ullerene 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鈥搗is, 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 C₆₀ 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.

Keywords:

graphene; [6,6]-phenyl-C61-butyric acid methyl ester (PCBM); pyrene; electron extraction layer; polymer solar cells