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Efficient Exciton Diffusion in Organic Bilayer Heterojunctions with Nonfullerene Small Molecular Acceptors
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-04-21 , DOI: 10.1021/acsenergylett.0c00564 Tack Ho Lee 1 , Song Yi Park 1 , Won-Woo Park 2 , Xiaoyan Du 3, 4 , Jae Hoon Son 5 , Ning Li 3, 4 , Oh-Hoon Kwon 2 , Han Young Woo 5 , Christoph J. Brabec 3, 4 , Jin Young Kim 1
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-04-21 , DOI: 10.1021/acsenergylett.0c00564 Tack Ho Lee 1 , Song Yi Park 1 , Won-Woo Park 2 , Xiaoyan Du 3, 4 , Jae Hoon Son 5 , Ning Li 3, 4 , Oh-Hoon Kwon 2 , Han Young Woo 5 , Christoph J. Brabec 3, 4 , Jin Young Kim 1
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Solution-processed bilayer organic solar cells (OSCs) with high performance are demonstrated for nonfullerene small molecular acceptors (NFAs). Unlike fullerene acceptors, NFAs show significant spectral overlap between their absorption and the photoluminescence (PL) of a polymer donor, which makes the design of an efficient exciton-harvesting bilayer heterojunction possible. Efficient exciton diffusion in the organic bilayer heterojunction is realized by long-range energy transfer between a polymer donor and NFAs. We observed efficient exciton diffusion from the polymer/NFA bilayer heterojunctions via thickness-dependent PL quenching and time-resolved PL measurements. Despite the strongly reduced donor–acceptor interface area, a substantial density of charge-transfer states is observed for the polymer/NFA bilayer heterojunctions by electroluminescence measurements. Overall, polymer/NFA bilayer heterojunction OSCs demonstrate a power conversion efficiency of 9%–10%, which is comparable to the photovoltaic performance of bulk heterojunction OSCs, with the additional advantage of simplified microstructure formation.
中文翻译：
非富勒烯小分子受体在有机双层异质结中的有效激子扩散。
溶液处理的双层有机太阳能电池（OSC）具有高性能，可用于非富勒烯小分子受体（NFA）。与富勒烯受体不同，NFA在其吸收和聚合物供体的光致发光（PL）之间显示出明显的光谱重叠，这使得设计有效的激子捕获双层异质结成为可能。有机双分子异质结中的有效激子扩散是通过聚合物供体与NFA之间的长距离能量转移实现的。我们观察到了聚合物/ NFA双层异质结通过厚度依赖性PL猝灭和时间分辨PL测量得到的有效激子扩散。尽管供体-受体界面面积大大减少，通过电致发光测量观察到聚合物/ NFA双层异质结的大量电荷转移态密度。总体而言，聚合物/ NFA双层异质结OSC的功率转换效率为9％-10％，可与本体异质结OSC的光伏性能相媲美，并具有简化的微结构形成的其他优势。
更新日期：2020-04-21
中文翻译：
非富勒烯小分子受体在有机双层异质结中的有效激子扩散。
溶液处理的双层有机太阳能电池（OSC）具有高性能，可用于非富勒烯小分子受体（NFA）。与富勒烯受体不同，NFA在其吸收和聚合物供体的光致发光（PL）之间显示出明显的光谱重叠，这使得设计有效的激子捕获双层异质结成为可能。有机双分子异质结中的有效激子扩散是通过聚合物供体与NFA之间的长距离能量转移实现的。我们观察到了聚合物/ NFA双层异质结通过厚度依赖性PL猝灭和时间分辨PL测量得到的有效激子扩散。尽管供体-受体界面面积大大减少，通过电致发光测量观察到聚合物/ NFA双层异质结的大量电荷转移态密度。总体而言，聚合物/ NFA双层异质结OSC的功率转换效率为9％-10％，可与本体异质结OSC的光伏性能相媲美，并具有简化的微结构形成的其他优势。
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