Fluorinated and Alkylthiolated Polymeric Donors Enable both Efficient Fullerene and Nonfullerene Polymer Solar Cells,Advanced Functional Materials

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Fluorinated and Alkylthiolated Polymeric Donors Enable both Efficient Fullerene and Nonfullerene Polymer Solar Cells
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-01-15 , DOI: 10.1002/adfm.201706404
Guangjun Zhang ₁ , Xiaopeng Xu ₁ , Zhaozhao Bi ₂ , Wei Ma ₂ , Dongsheng Tang ₁ , Ying Li ₁ , Qiang Peng ₁

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In this work, four donor (D)–acceptor (A) copolymers based on benzodithiophene (BDT) and benzothiadiazole (BT) with different alkylthiolated and/or fluorinated side chains are developed for efficient fullerene and nonfullerene polymer solar cells (PSCs). The synergistic effect of sulfuration and fluorination on the optical absorption, energy level, crystallinity, carrier mobility, blend morphology, and photovoltaic performance is investigated systematically. By incorporating sulfur atoms onto the side chains, a little blueshifted but significantly increased absorption can be obtained for PBDTS‐FBT compared to PBDT‐FBT. On the other side, a little more blueshifted but much stronger absorption and much lower‐lying highest occupied molecular orbital (HOMO) level can be realized for PBDTF‐FBT when introducing fluorine atoms instead of sulfur atoms. With the combination of both fluorination and sulfuration strategies, PBDTS‐FBT exhibits the best absorption ability, lowest HOMO energy level, and highest crystallinity, which make PBDTSF‐FBT devices show the highest power conversion efficiency (PCE) of 10.69% in fullerene PSCs and 11.66% in nonfullerene PSCs. The PCE of 11.66% is the best value for PSCs based on BT‐containing copolymer donors reported so far. The results indicate that fluorination and sulfuration have a synergistically positive effect on the performance of D–A photovoltaic copolymers and their solar cell devices.

中文翻译：

氟化和烷基硫醇化的聚合物给体可实现高效的富勒烯和非富勒烯聚合物太阳能电池

在这项工作中，开发了基于苯并二噻吩（BDT）和苯并噻二唑（BT）的具有不同烷基硫醇化和/或氟化侧链的四种供体（D）-受体（A）共聚物，用于有效的富勒烯和非富勒烯聚合物太阳能电池（PSC）。系统地研究了硫化和氟化对光吸收，能级，结晶度，载流子迁移率，共混物形态和光伏性能的协同作用。通过将硫原子结合到侧链上，与PBDT-FBT相比，PBDTS-FBT可获得少许蓝移但吸收显着增加的效果。另一方面，对于当引入氟原子而不是硫原子时为PBDTF-FBT。结合氟化和硫化策略，PBDTS-FBT表现出最佳的吸收能力，最低的HOMO能级和最高的结晶度，这使得PBDTSF-FBT器件在富勒烯PSC中的功率转换效率（PCE）最高，为10.69％。非富勒烯PSC中的11.66％。基于迄今为止报道的含BT的共聚物供体，PCE的PCE为11.66％，是最佳值。结果表明，氟化和硫化对D–A光伏共聚物及其太阳能电池器件的性能具有协同的积极影响。

更新日期：2018-01-15

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