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The Influence of Solvent Additive on Polymer Solar Cells Employing Fullerene and Non‐Fullerene Acceptors
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2017-11-27 , DOI: 10.1002/aelm.201700358 Xin Song 1 , Nicola Gasparini 1 , Derya Baran 1
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2017-11-27 , DOI: 10.1002/aelm.201700358 Xin Song 1 , Nicola Gasparini 1 , Derya Baran 1
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Small‐molecule‐based non‐fullerene acceptors (NFAs) are emerging as a new field in organic photovoltaics, due to their structural versatility, the tunability of their energy levels, and their ease of synthesis. High‐efficiency polymer donors have been tested with these non‐fullerene acceptors in order to further boost the efficiency of organic solar cells. Most of the polymer:fullerene systems are optimized with solvent additives for high efficiency, while little attention has been paid to NFA‐based solar cells so far. In this report, the effect of the most common additive, 1,8‐diiodooctane (DIO), on PTB7‐Th:PC71BM solar cells is investigated and it is compared with non‐fullerene acceptor 3,9‐bis(2‐methylene‐(3‐(1,1‐dicyanomethylene)‐indanone))‐5,5,11,11‐tetrakis(4‐hexylphenyl)‐dithieno[2,3‐d:2′,3′‐d′]‐s‐indaceno‐[1,2‐b:5,6b′]di‐thiophene (ITIC) devices. It is interesting that the high boiling solvent additive does have a negative impact on the power conversion efficiency when PTB7‐Th is blended with ITIC acceptor. The solar cell devices are studied in terms of their optical, photophysical, and morphological properties and find out that PTB7‐Th:ITIC devices with DIO results in coarser domains, reduced absorption strength, and slightly lower mobility, while DIO improves the absorption strength of the PTB7‐Th:PC71BM blend film and increase the aggregation of PC71BM in the blend, resulting in higher fill factor and Jsc.
中文翻译：
溶剂添加剂对采用富勒烯和非富勒烯受体的聚合物太阳能电池的影响
基于小分子的非富勒烯受体（NFA）由于其结构的多功能性，能级的可调性以及易于合成而成为有机光伏领域的一个新领域。为了进一步提高有机太阳能电池的效率，已经对这些非富勒烯受体进行了高效聚合物供体的测试。大多数的聚合物：富勒烯体系都通过溶剂添加剂进行了优化，以提高效率，而迄今为止，对基于NFA的太阳能电池的关注很少。在本报告中，研究了最常见的添加剂1,8-二碘辛烷（DIO）对PTB7-Th：PC 71 BM太阳能电池的影响，并将其与非富勒烯受体3,9-bis（2-亚甲基-（3-（1,1-二氰基亚甲基）-茚满酮））-5,5,11,11-四（4-己基苯基）-二硫代[2,3-d：2'，3'-d']-s -indaceno- [1,2-b：5,6b']二噻吩（ITIC）设备。有趣的是，当PTB7-Th与ITIC受体混合时，高沸点溶剂添加剂确实会对功率转换效率产生负面影响。对太阳能电池器件的光学，光物理和形态特性进行了研究，发现具有DIO的PTB7-Th：ITIC器件会导致较粗的畴，降低的吸收强度和稍低的迁移率，而DIO则提高了DIO的吸收强度。 PTB7-Th：PC 71 BM共混膜，并增加PC 71 BM在共混物中的聚集，从而提高填充系数和J sc。
更新日期：2017-11-27
中文翻译：
溶剂添加剂对采用富勒烯和非富勒烯受体的聚合物太阳能电池的影响
基于小分子的非富勒烯受体（NFA）由于其结构的多功能性，能级的可调性以及易于合成而成为有机光伏领域的一个新领域。为了进一步提高有机太阳能电池的效率，已经对这些非富勒烯受体进行了高效聚合物供体的测试。大多数的聚合物：富勒烯体系都通过溶剂添加剂进行了优化，以提高效率，而迄今为止，对基于NFA的太阳能电池的关注很少。在本报告中，研究了最常见的添加剂1,8-二碘辛烷（DIO）对PTB7-Th：PC 71 BM太阳能电池的影响，并将其与非富勒烯受体3,9-bis（2-亚甲基-（3-（1,1-二氰基亚甲基）-茚满酮））-5,5,11,11-四（4-己基苯基）-二硫代[2,3-d：2'，3'-d']-s -indaceno- [1,2-b：5,6b']二噻吩（ITIC）设备。有趣的是，当PTB7-Th与ITIC受体混合时，高沸点溶剂添加剂确实会对功率转换效率产生负面影响。对太阳能电池器件的光学，光物理和形态特性进行了研究，发现具有DIO的PTB7-Th：ITIC器件会导致较粗的畴，降低的吸收强度和稍低的迁移率，而DIO则提高了DIO的吸收强度。 PTB7-Th：PC 71 BM共混膜，并增加PC 71 BM在共混物中的聚集，从而提高填充系数和J sc。
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