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Gradual Fluorination on the Phenyl Side Chains for Benzodithiophene-Based Linear Polymers to Improve the Photovoltaic Performance.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-07-28 , DOI: 10.1021/acsami.0c07720 Peng Lei 1, 2 , Bao Zhang 1, 3 , You Chen 1, 2 , Yanfang Geng 1 , Qingdao Zeng 1 , Ailing Tang 1 , Erjun Zhou 1, 2
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-07-28 , DOI: 10.1021/acsami.0c07720 Peng Lei 1, 2 , Bao Zhang 1, 3 , You Chen 1, 2 , Yanfang Geng 1 , Qingdao Zeng 1 , Ailing Tang 1 , Erjun Zhou 1, 2
Affiliation
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To study the impact of introducing fluorine atoms onto the conjugated phenyl side chains of benzo[1,2-b:4,5-b′]dithiophene (BDT)-based copolymers, three novel donor−π–acceptor (D−π–A) alternative polymers PE40, PE42, and PE44 were designed and synthesized. The phenyl-substituted-BDT, thieno[3,2-b]thiophene, and benzo[d][1,2,3]triazole (BTA) served as the donor, π-bridge, and acceptor units, respectively, to enable linear polymer backbones. When introducing two or four fluorine atoms into the phenyl side units of PE40, the polymers PE42 and PE44 demonstrate a gradual decrease of energy levels and an increase of crystallinity in the pristine and blend films. It was noted that the increase in fluorine atoms gradually improved the performance parameters of polymer solar cells (PSCs) with Y6 as the acceptor. The PE40:Y6 device yielded a power conversion efficiency (PCE) of up to 7.07% with a short-circuit (JSC) of 21.36 mA cm–2, an open-circuVOC) of 0.65 V, and a fill factor (FF) of 0.51, and PE42:Y6 exhibited a better PCE of 10.11% (JSC = 23.25 mA cm–2, VOC = 0.74 V, and FF = 0.59), while PE44:Y6 exhibited the best PCE of 13.62% (JSC = 25.29 mA cm–2, VOC = 0.82 V, and FF = 0.66). The suitable energy offsets between the donor and the acceptor, high and balanced charge-carrier mobility, and the optimal morphology of the blend film contributed to the high performance of PE44:Y6 combination. Our results demonstrate that introducing more fluorine atoms onto the phenyl side units of BDT is a prospective approach to break the trade-offs between VOC, JSC, and FF, and finally improve the performance of PSCs.
中文翻译：
苯并二噻吩基线性聚合物的苯基侧链上的逐渐氟化，可改善光伏性能。
为了研究将氟原子引入苯并[1,2- b：4,5- b ']二噻吩（BDT）基共聚物的共轭苯基侧链的影响，提出了三种新型的供体-π-受体（D-π- A）设计并合成了替代聚合物PE40，PE42和PE44。苯基取代的BDT，噻吩并[3,2- b ]噻吩和苯并[ d ] [1,2,3]三唑（BTA）分别用作供体，π桥和受体单元线性聚合物主链。当将两个或四个氟原子引入PE40的苯基侧单元时，聚合物PE42和PE44证明原始膜和共混膜的能级逐渐降低，结晶度增加。注意到氟原子的增加逐渐改善了以Y6为受体的聚合物太阳能电池（PSC）的性能参数。在PE40：Y6设备产生了一个功率转换效率（PCE）至7.07％与短路（Ĵ SC的21.36毫安厘米）-2，开放式断路器操作过电压V OC为0.65V的），和填充系数（ FF）为0.51，而PE42：Y6的PCE更好，为10.11％（J SC = 23.25 mA cm –2，V OC = 0.74 V，FF = 0.59），而PE44：Y6表现出13.62％的最佳PCE（Ĵ SC =25.29毫安厘米-2，V OC = 0.82 V，和FF = 0.66）。供体和受体之间的合适能量偏移，高且平衡的载流子迁移率以及共混膜的最佳形态有助于PE44：Y6组合的高性能。我们的结果表明，在BDT的苯基侧单元上引入更多的氟原子是打破V OC，J SC和FF之间权衡并最终改善PSC性能的一种前瞻性方法。
更新日期：2020-08-26
中文翻译：
苯并二噻吩基线性聚合物的苯基侧链上的逐渐氟化，可改善光伏性能。
为了研究将氟原子引入苯并[1,2- b：4,5- b ']二噻吩（BDT）基共聚物的共轭苯基侧链的影响，提出了三种新型的供体-π-受体（D-π- A）设计并合成了替代聚合物PE40，PE42和PE44。苯基取代的BDT，噻吩并[3,2- b ]噻吩和苯并[ d ] [1,2,3]三唑（BTA）分别用作供体，π桥和受体单元线性聚合物主链。当将两个或四个氟原子引入PE40的苯基侧单元时，聚合物PE42和PE44证明原始膜和共混膜的能级逐渐降低，结晶度增加。注意到氟原子的增加逐渐改善了以Y6为受体的聚合物太阳能电池（PSC）的性能参数。在PE40：Y6设备产生了一个功率转换效率（PCE）至7.07％与短路（Ĵ SC的21.36毫安厘米）-2，开放式断路器操作过电压V OC为0.65V的），和填充系数（ FF）为0.51，而PE42：Y6的PCE更好，为10.11％（J SC = 23.25 mA cm –2，V OC = 0.74 V，FF = 0.59），而PE44：Y6表现出13.62％的最佳PCE（Ĵ SC =25.29毫安厘米-2，V OC = 0.82 V，和FF = 0.66）。供体和受体之间的合适能量偏移，高且平衡的载流子迁移率以及共混膜的最佳形态有助于PE44：Y6组合的高性能。我们的结果表明，在BDT的苯基侧单元上引入更多的氟原子是打破V OC，J SC和FF之间权衡并最终改善PSC性能的一种前瞻性方法。
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