Efficient Energy Sensitization of C60 and Application to Organic Photovoltaics

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• 作者：Cong Trinh ; Kent O. Kirlikovali ; Andrew N. Bartynski ; Christopher J. Tassone ; Michael F. Toney ; George F. Burkhard ; Michael D. McGehee ; Peter I. Djurovich ; Mark E. Thompson
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：August 14, 2013
• 年：2013
• 卷：135
• 期：32
• 页码：11920-11928
• 全文大小：503K
• 年卷期：v.135,no.32(August 14, 2013)
• ISSN：1520-5126

文摘

Fullerenes are currently the most popular electron-acceptor material used in organic photovoltaics (OPVs) due to their superior properties, such as good electron conductivity and efficient charge separation at the donor/acceptor interface. However, low absorptivity in the visible spectral region is a significant drawback of fullerenes. In this study, we have designed a zinc chlorodipyrrin derivative (ZCl) that absorbs strongly in the visible region (450鈥?00 nm) with an optical density 7-fold higher than a C₆₀ film. ZCl efficiently transfers absorbed photoenergy to C₆₀ in mixed films. Application of ZCl as an energy sensitizer in OPV devices leads to an increase in the photocurrent from the acceptor layer, without changing the other device characteristics, i.e., open circuit voltage and fill factor. For example, C₆₀-based OPVs with and without the sensitizer give 4.03 and 3.05 mA/cm², respectively, while both have V_OC = 0.88 V and FF = 0.44. Our ZCl sensitization approach improves the absorbance of the electron-acceptor layer while still utilizing the beneficial characteristics of C₆₀ in OPVs.