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首页> 外文期刊>Organic Electronics >High open-circuit voltage of the solution-processed organic solar cells based on benzothiadiazole-triphenylamine small molecules incorporating 7t-linkage
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High open-circuit voltage of the solution-processed organic solar cells based on benzothiadiazole-triphenylamine small molecules incorporating 7t-linkage

机译：基于结合了7t键的苯并噻二唑-三苯胺小分子的固溶有机太阳能电池的高开路电压

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摘要

Two novel small molecular photovoltaic (PV) materials, BDPTBT and BDATBT were designed and synthesized, consisting of 5,6-bis-(octyloxy)benzo[c][1,2,5]thiadiazole (DOBT) as electron-withdrawing core (A), and triphenylamine (TPA) as electron-donating side group (D). Moreover, the benzene and ethynylbenzene as π-linkage were introduced to form donor-π-acceptor-π-donor (D-π-A-π-D) typed molecular structures, respectively. To fully investigate the linkage effect of a series of small molecules, two reference compounds BDCTBT and BDETBT were also studied systematically, consisting of 2-phenylacr-ylonitrile and styrene as π-linkage, respectively. As a result, the π-linkage units, benzene, styrene, ethynylbenzene and 2-phenylacrylonitrile played an important role in modifying molecular structure and improving PV performance. Bulk heterojunction (BHJ) solar cells based on BDPTBT/PC_(61)BM and BDATBT/PC_(61)BM yielded the power conversion efficiencies (PCEs) of 2.99% and 2.03%, respectively. Notably, BDATBT based device showed a high open-circuit voltage (Voc) of 1.03 V. Compared to the results we have reported previously, the reference devices based on BDCTBT/PC_(61)BM and BDETBT/PC_(61)BM with the optimized weight ratio showed dramatically enhanced PCEs of 4.84% and 3.40%, respectively, and BDCTBT based device showed a high Voc of 1.08 V. To our knowledge, the Voc of 1.08 V is the highest voltage reported to date for devices prepared from solution-processed small-molecule-donor materials, and the PCE of 4.84% is the highest efficiency reported so far for D-A-D-typed benzothiadiazole (BT)-TPA based solution-processed small molecules PV devices.
机译：设计并合成了两种新型的小分子光伏（PV）材料BDPTBT和BDATBT，它们由5,6-双-（辛氧基）苯并[c] [1,2,5]噻二唑（DOBT）作为吸电子核（ A）和三苯胺（TPA）作为供电子侧基（D）。此外，引入苯和乙炔基苯作为π键，分别形成供体-π-受体-π-供体（D-π-A-π-D）型分子结构。为了充分研究一系列小分子的连接作用，还系统地研究了两种参考化合物BDCTBT和BDETBT，它们分别由2-苯基丙烯腈和苯乙烯作为π键。结果，π键单元，苯，苯乙烯，乙炔基苯和2-苯基丙烯腈在改变分子结构和改善PV性能中起重要作用。基于BDPTBT / PC_（61）BM和BDATBT / PC_（61）BM的体异质结（BHJ）太阳能电池的功率转换效率（PCE）分别为2.99％和2.03％。值得注意的是，基于BDATBT的设备显示了1.03 V的高开路电压（Voc）。与我们先前报道的结果相比，基于BDCTBT / PC_（61）BM和BDETBT / PC_（61）BM的参考设备具有较高的开路电压。优化的重量比分别显示出4.84％和3.40％的PCE显着提高，而基于BDCTBT的器件显示出1.08 V的高Voc。据我们所知，1.08 V的Voc是迄今为止报道的由溶液制备的器件的最高电压。加工的小分子供体材料，PCE为4.84％，是迄今为止DAD型苯并噻二唑（BT）-TPA溶液加工的小分子PV器件的最高效率。

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