Effect of Fluorine Substitution on Photovoltaic Properties of Alkoxyphenyl Substituted Benzo[1,2-b:4,5-b鈥瞉dithiophene-Based Small Molecules

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• 作者：Beibei Qiu ; Jun Yuan ; Xuxian Xiao ; Dingjun He ; Lixia Qiu ; Yingping Zou ; Zhi-guo Zhang ; Yongfang Li
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：November 18, 2015
• 年：2015
• 卷：7
• 期：45
• 页码：25237-25246
• 全文大小：799K
• ISSN：1944-8252

文摘

Two new small molecules, C3T-BDTP and C3T-BDTP-F with alkoxyphenyl-substituted benzo[1,2-b:4,5-b鈥瞉dithiophene (BDT) and meta-fluorinated-alkoxyphenyl-substituted BDT as the central donor blocks, respectively, have been synthesized and used as donor materials in organic solar cells (OSCs). With the addition of 0.4% v/v 1,8-diiodooctane (DIO), the blend of C3T-BDTP-F/PC₇₁BM showed a higher hole mobility of 8.67 脳 10^鈥? cm² V^鈥? s^鈥? compared to that of the blend of C3T-BDTP/PC₇₁BM. Two types of interlayers, zirconium acetylacetonate (ZrAcac) and perylene diimide (PDI) derivatives (PDINO and PDIN), were used to further optimize the performance of OSCs. With a device structure of ITO/PEDOT:PSS/donor:PC₇₁BM/PDIN/Al, the OSCs based on C3T-BDTP delivered a satisfying power conversion efficiency (PCE) of 5.27% with an open circuit voltage (V_oc) of 0.91 V, whereas the devices based on C3T-BDTP-F showed an enhanced PCE of 5.42% with a higher V_oc of 0.97 V.