Highly efficient inverted polymer solar cells based on a cross-linkable water-/alcohol-soluble conjugated polymer interlayer.
Highly efficient inverted polymer solar cells based on a cross-linkable water-/alcohol-soluble conjugated polymer interlayer.
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DOI：
10.1021/am501920z
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发表时间：
2014-06
影响因子：
9.5
通讯作者：
Kai Zhang;Chengmei Zhong;Shengjian Liu;Cheng Mu;Zhengke Li;H. Yan;F. Huang;Yong Cao
中科院分区：
文献类型：
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作者：
Kai Zhang;Chengmei Zhong;Shengjian Liu;Cheng Mu;Zhengke Li;H. Yan;F. Huang;Yong Cao
设计了一种交联型水/醇溶性共轭聚合物材料聚[9，9-双（6 ′-（N，N-二乙氨基）丙基）芴-alt-9，9-双（3-乙基（氧杂环丁烷-3-乙氧基）己基）芴]（PFN-OX）。PFN-OX的交联性质有利于制备具有良好界面的倒置聚合物太阳能电池（PSC），并研究基于聚[4，8-双（2-乙基己氧基）苯并[1，2-B：4，5-b ']二噻吩-2，6-二基-交替-乙基己基-3-氟噻吩并[3，4-B]噻吩-2-羧酸酯-4，6-二基]（PTB 7）和（6，6）-苯基-C71-丁酸甲酯（PC 71 BM）共混活性层的高效倒置PSC的详细工作机理。研究了WSCP材料在高效PSC中的详细工作机理，并将其归纳为以下三种效应：a）PFN-OX调节阴极功函数以提高开路电压（Voc）; B）PFN-OX在界面处掺杂PC 71 BM以促进电子提取;以及c）PFN-OX提取电子并阻挡空穴以提高填充因子（FF）。在此基础上，通过在ITO和PFN-OX之间添加ZnO层，进一步提高了PFN-OX中间层的空穴阻挡功能，得到了功率转换效率为9.28%，填充因子高达74.4%的倒置型PSC。
A cross-linkable water/alcohol soluble conjugated polymer (WSCP) material poly[9,9-bis(6'-(N,N-diethylamino)propyl)-fluorene-alt-9,9-bis(3-ethyl(oxetane-3-ethyloxy)-hexyl) fluorene] (PFN-OX) was designed. The cross-linkable nature of PFN-OX is good for fabricating inverted polymer solar cells (PSCs) with well-defined interface and investigating the detailed working mechanism of high-efficiency inverted PSCs based on poly[4,8-bis(2-ethylhexyloxyl)benzo[1,2-b:4,5-b']dithio-phene-2,6-diyl-alt-ethylhexyl-3-fluorothithieno[3,4-b]thiophene-2-carboxylate-4,6-diyl] (PTB7) and (6,6)-phenyl-C71-butyric acid methyl ester (PC71BM) blend active layer. The detailed working mechanism of WSCP materials in high-efficiency PSCs were studied and can be summarized into the following three effects: a) PFN-OX tunes cathode work function to enhance open-circuit voltage (Voc); b) PFN-OX dopes PC71BM at interface to facilitate electron extraction; and c) PFN-OX extracts electrons and blocks holes to enhance fill factor (FF). On the basis of this understanding, the hole-blocking function of the PFN-OX interlayer was further improved with addition of a ZnO layer between ITO and PFN-OX, which led to inverted PSCs with a power conversion efficiency of 9.28% and fill factor high up to 74.4%.