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Bandgap Tailored Nonfullerene Acceptors for Low-Energy-Loss Near-Infrared Organic Photovoltaics
ACS Materials Letters ( IF 9.6 ) Pub Date : 2020-03-06 , DOI: 10.1021/acsmaterialslett.9b00512 Jaewon Lee 1 , Seyeong Song 2, 3 , Jianfei Huang 2 , Zhifang Du 2 , Hansol Lee 4 , Ziyue Zhu 2 , Seo-Jin Ko 5 , Thuc-Quyen Nguyen 2 , Jin Young Kim 3 , Kilwon Cho 4 , Guillermo C. Bazan 6, 7
ACS Materials Letters ( IF 9.6 ) Pub Date : 2020-03-06 , DOI: 10.1021/acsmaterialslett.9b00512 Jaewon Lee 1 , Seyeong Song 2, 3 , Jianfei Huang 2 , Zhifang Du 2 , Hansol Lee 4 , Ziyue Zhu 2 , Seo-Jin Ko 5 , Thuc-Quyen Nguyen 2 , Jin Young Kim 3 , Kilwon Cho 4 , Guillermo C. Bazan 6, 7
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A series of A−π–D−π–A-type nonfullerene acceptors (NFAs) was designed and synthesized with the goal of optimizing light absorption and energy losses in near-infrared (NIR) organic solar cells (OSCs) principally through the use of side-chain engineering. Specific molecules include p-IO1, o-IO1, p-IO2, and o-IO2 with optical bandgaps of 1.34, 1.28, 1.24, and 1.20 eV, respectively. Manipulating the optoelectronic properties and intermolecular organization by substituting bulky phenylhexyl (p-) for linear octyl chains (o-) and replacing bisalkoxy (-O2) with alkyl-alkoxy combination (-O1) allows one to target energy bandgaps and achieve a favorable bulk heterojunction morphology when in the presence of the donor polymer PTB7-Th. Solar cells based on o-IO1 and PTB7-Th exhibit an optimal power conversion efficiency of 13.1%. The excellent photovoltaic performance obtained with the o-IO1 acceptor can be attributed to a short-circuit current of 26.3 mA cm–2 and energy losses on the order of 0.54 eV. These results further highlight how side-chain engineering is a straightforward strategy to tune the molecular design of n-type molecular semiconductors, particularly in the context of NIR high-efficiency organic photovoltaics.
中文翻译：
带隙量身定制的非富勒烯受体，用于低能量损失的近红外有机光伏
设计并合成了一系列A-π-D-π-A型非富勒烯受体（NFA），其目的主要是通过使用来优化近红外（NIR）有机太阳能电池（OSC）的光吸收和能量损耗。侧链工程。特定分子包括光学带隙分别为1.34、1.28、1.24和1.20 eV的p-IO1，o-IO1，p-IO2和o-IO2。通过用大体积的苯基己基（p-）取代线性辛基链（o-）并用烷基-烷氧基组合（-O1）取代双烷氧基（-O2）来操纵光电性能和分子间组织，可以使人们瞄准能带隙并实现良好的体积供体聚合物PTB7-Th存在时的异质结形态。基于o-IO1和PTB7-Th的太阳能电池表现出13.1％的最佳功率转换效率。–2，能量损耗约为0.54 eV。这些结果进一步突出了侧链工程技术是调节n型分子半导体的分子设计的直接策略，尤其是在NIR高效有机光伏领域。
更新日期：2020-04-23
中文翻译：
带隙量身定制的非富勒烯受体，用于低能量损失的近红外有机光伏
设计并合成了一系列A-π-D-π-A型非富勒烯受体（NFA），其目的主要是通过使用来优化近红外（NIR）有机太阳能电池（OSC）的光吸收和能量损耗。侧链工程。特定分子包括光学带隙分别为1.34、1.28、1.24和1.20 eV的p-IO1，o-IO1，p-IO2和o-IO2。通过用大体积的苯基己基（p-）取代线性辛基链（o-）并用烷基-烷氧基组合（-O1）取代双烷氧基（-O2）来操纵光电性能和分子间组织，可以使人们瞄准能带隙并实现良好的体积供体聚合物PTB7-Th存在时的异质结形态。基于o-IO1和PTB7-Th的太阳能电池表现出13.1％的最佳功率转换效率。–2，能量损耗约为0.54 eV。这些结果进一步突出了侧链工程技术是调节n型分子半导体的分子设计的直接策略，尤其是在NIR高效有机光伏领域。
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