A(2)-A(1)-D-A(1)-A(2) Type Non-Fullerene Acceptors with 2-(1,1-Dicyanomethylene)rhodanine as the Terminal Groups for Poly(3-hexylthiophene)-Based Organic Solar Cells
A(2)-A(1)-D-A(1)-A(2) Type Non-Fullerene Acceptors with 2-(1,1-Dicyanomethylene)rhodanine as the Terminal Groups for Poly(3-hexylthiophene)-Based Organic Solar Cells
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以2-(1,1-二氰亚甲基)绕丹宁为端基的A(2)-A(1)-D-A(1)-A(2)型非富勒烯受体用于聚(3-己基噻吩)基有机太阳能
DOI：
10.1021/acsami.8b10312
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发表时间：
2018
影响因子：
9.5
通讯作者：
Zhou Erjun
中科院分区：
文献类型：
--
作者：
Xiao Bo;Tang Ailing;Zhang Qianqian;Li Gongqiang;Wang Xiaochen;Zhou Erjun
2-（1,1-二氰亚甲基）罗丹宁（RCN）是构建非富勒烯受体（nfa）的重要缺电子末端单元，以复杂的p型聚合物为电子给体，实现了超过12%的功率转换效率（PCE）。然而，当与经典的p型聚合物聚（3-己基噻吩）（P3HT）配对时，rcn基nfa的光伏性能并不理想。为了在这方面做出贡献，我们设计了两个基于rcn的a2 - a1 - d - a1 - a2结构的小分子受体bt3和bta3，其中苯并噻唑（BT）和苯并三唑（BTA）分别桥接在a1片段上，以调节光电性能。结果表明，P3HT: bta3太阳能电池的PCE为5.64%，avocv为0.90 V，填充系数（FF）为0.65，明显优于P3HT:BT3太阳能电池（PCE = 2.55%，VOC= 0.72 V, FF = 0.61）。P3HT: bta3薄膜较高的电子迁移率表明，即使在P3HT: bta3薄膜的重量比为1:0.3时，bta3也倾向于形成一个连续的电子传递途径。我们的研究结果表明，与BT相比，引入弱吸电子构件BTA是一种有效的策略，可以提高基于rcn的NFA器件的性能。
2-(1,1-Dicyanomethylene)rhodanine (RCN) is an important electron-deficient terminal unit to build non-fullerene acceptors (NFAs) having been realized high power conversion efficiency (PCE) beyond 12% with complicated p-type polymer as electron donor. However, the photovoltaic properties of RCN-based NFAs are unsatisfied when paired with the classic p-type polymer poly(3-hexylthiophene) (P3HT). In order to make a contribution in this regard, we designed two RCN-based small molecular acceptors with A2–A1–D–A1–A2structure,BT3andBTA3, where benzothiadiazole (BT) and benzotriazole (BTA) are bridged A1segments, respectively, to modulate the optoelectronic properties. As a result, P3HT:BTA3solar cell exhibits a promising PCE of 5.64%, with aVOCof 0.90 V and a fill factor (FF) of 0.65, which is obviously much better than that of P3HT:BT3(PCE = 2.55%,VOC= 0.72 V, FF = 0.61). The higher electron mobility of P3HT:BTA3film indicatesBTA3tends to form a continuous pathway for electron transport even at a lower weight ratio of 1:0.3 than 1:0.5 for P3HT:BT3film. Our results indicate that introducing a weak electron-withdrawing building block BTA is an effective strategy compared with the BT counterpart to improve the performance of RCN-based NFA devices.