Star-shaped D-A small molecules based on diketopyrrolopyrrole and triphenylamine for efficient solution-processed organic solar cells.
Star-shaped D-A small molecules based on diketopyrrolopyrrole and triphenylamine for efficient solution-processed organic solar cells.
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DOI：
10.1021/am302623k
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发表时间：
2013-01
影响因子：
9.5
通讯作者：
Junying Pan;Lijian Zuo;Xiao-lian Hu;W. Fu;Meirong Chen;Lei Fu;Xiao Gu;Hangqi Shi;M. Shi
中科院分区：
文献类型：
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作者：
Junying Pan;Lijian Zuo;Xiao-lian Hu;W. Fu;Meirong Chen;Lei Fu;Xiao Gu;Hangqi Shi;M. Shi
以三苯胺（TPA）为核心，二酮吡咯（DPP）为臂，未取代或取代苯环（苯基，P； 4-氟苯基，4-FP； 4-正丁基苯基，4-BuP）为端基，设计合成了（P-DPP）(3)TPA、（4-FP）(3)TPA和（4- bupp）(3)TPA三个星形D-A小分子。这三种小分子均表现出相对较窄的光学带隙（1.68 ~ 1.72 eV）和较低的最高已占据分子轨道（HOMO）能级（-5.09 ~ -5.13 eV），这意味着它们是有机太阳能电池（OSCs）潜在的良好电子供体。然后，研究了以[6,6]-苯基- c(61)-丁酸甲酯（PC(61)BM）为电子受体的共混小分子的光伏性能。在三个小分子中，基于（P-DPP）(3)TPA:PCBM共混物的OSC表现出最佳的功率转换效率（PCE）为2.98%，开路电压（V(oc)）为0.72 V，短路电流密度（J(sc)）为7.94 mA/cm(2)，填充因子（FF）为52.2%，这可能归因于（P-DPP）(3)TPA的最高空穴迁移率。
Three star-shaped D-A small molecules, (P-DPP)(3)TPA, (4-FP-DPP)(3)TPA, and (4-BuP-DPP)(3)TPA were designed and synthesized with triphenylamine (TPA) as the core, diketopyrrolopyrrole (DPP) as the arm, and unsubstituted or substituted benzene rings (phenyl, P; 4-fluoro-phenyl, 4-FP; 4-n-butyl-phenyl, 4-BuP) as the end-group. All the three small molecules show relatively narrow optical band gaps (1.68-1.72 eV) and low-lying highest occupied molecular orbital (HOMO) energy levels (-5.09∼-5.13 eV), implying that they are potentially good electron donors for organic solar cells (OSCs). Then, photovoltaic properties of the small molecules blended with [6,6]-phenyl-C(61)-butyric acid methyl ester (PC(61)BM) as electron acceptor were investigated. Among three small molecules, the OSC based on (P-DPP)(3)TPA:PCBM blend exhibits a best power conversion efficiency (PCE) of 2.98% with an open-circuit voltage (V(oc)) of 0.72 V, a short-circuit current density (J(sc)) of 7.94 mA/cm(2), and a fill factor (FF) of 52.2%, which may be ascribed to the highest hole mobility of (P-DPP)(3)TPA.