Balanced Partnership between Donor and Acceptor Components in Nonfullerene Organic Solar Cells with >12% Efficiency,Advanced Materials

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Balanced Partnership between Donor and Acceptor Components in Nonfullerene Organic Solar Cells with >12% Efficiency
Advanced Materials ( IF 27.4 ) Pub Date : 2018-03-07 , DOI: 10.1002/adma.201706363
Yuze Lin ₁ , Fuwen Zhao ₂ , Shyamal K. K. Prasad ₃ , Jing-De Chen ₄ , Wanzhu Cai ₅ , Qianqian Zhang ₆ , Kai Chen ₃ , Yang Wu ₇ , Wei Ma ₇ , Feng Gao ₅ , Jian-Xin Tang ₄ , Chunru Wang ₂ , Wei You ₆ , Justin M. Hodgkiss ₃ , Xiaowei Zhan ₁

Affiliation

Relative to electron donors for bulk heterojunction organic solar cells (OSCs), electron acceptors that absorb strongly in the visible and even near‐infrared region are less well developed, which hinders the further development of OSCs. Fullerenes as traditional electron acceptors have relatively weak visible absorption and limited electronic tunability, which constrains the optical and electronic properties required of the donor. Here, high‐performance fullerene‐free OSCs based on a combination of a medium‐bandgap polymer donor (FTAZ) and a narrow‐bandgap nonfullerene acceptor (IDIC), which exhibit complementary absorption, matched energy levels, and blend with pure phases on the exciton diffusion length scale, are reported. The single‐junction OSCs based on the FTAZ:IDIC blend exhibit power conversion efficiencies up to 12.5% with a certified value of 12.14%. Transient absorption spectroscopy reveals that exciting either the donor or the acceptor component efficiently generates mobile charges, which do not suffer from recombination to triplet states. Balancing photocurrent generation between the donor and nonfullerene acceptor removes undesirable constraints on the donor imposed by fullerene derivatives, opening a new avenue toward even higher efficiency for OSCs.

中文翻译：

非富勒烯有机太阳能电池中供体和受体成分之间的平衡伙伴关系，效率> 12％

相对于整体异质结有机太阳能电池（OSC）的电子供体，在可见光甚至近红外区域吸收能力强的电子受体的开发不太好，这阻碍了OSC的进一步发展。作为传统电子受体的富勒烯具有相对弱的可见光吸收和有限的电子可调性，这限制了供体所需的光学和电子性质。在这里，基于中带隙聚合物供体（FTAZ）和窄带隙非富勒烯受体（IDIC）的组合，高性能的不含富勒烯的OSC表现出互补的吸收，匹配的能级，并与纯相混合。报告了激子扩散长度的尺度。基于FTAZ：IDIC混合的单结OSC具有高达12的功率转换效率。5％，认证价值为12.14％。瞬态吸收光谱显示，激发供体或受体组分可有效产生可迁移的电荷，而不会重组为三重态。供体和非富勒烯受体之间平衡光电流的产生消除了富勒烯衍生物对给体的不希望有的限制，为OSC的更高效率开辟了一条新途径。

更新日期：2018-03-07

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