Asymmetrically Alkyl‐Substituted Wide‐Bandgap Nonfullerene Acceptor for Organic Solar Cells,Solar RRL

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Asymmetrically Alkyl‐Substituted Wide‐Bandgap Nonfullerene Acceptor for Organic Solar Cells
Solar RRL ( IF 6.0 ) Pub Date : 2020-03-01 , DOI: 10.1002/solr.202000061
Tian Xia ₁ , Chao Li ₁ , Hwa Sook Ryu ₂ , Xiaobo Sun ₁ , Han Young Woo ₂ , Yanming Sun ₁

Affiliation

An asymmetric wide‐bandgap (WBG) nonfullerene acceptor (C₆‐IDTT‐T) is developed by shearing one alkyl side‐chain from a symmetrically alkyl‐substituted indacenodithieno[3,2‐b]thiophene (IDTT) core of the fused‐ring electron acceptor 2C₆‐IDTT‐T. These two acceptors both exhibit wide optical bandgaps over 1.8 eV. Investigations on the optical, electrochemical, and active layer morphology are conducted to understand the effect of asymmetric side chains on the electrical and photovoltaic properties. Compared with symmetric 2C₆‐IDTT‐T, asymmetric C₆‐IDTT‐T is found to exhibit redshifted absorption and higher electron mobility. As a result, the C₆‐IDTT‐T blend with a thienothiophene‐benzodithiophene copolymer (PTB7‐Th) presents higher electron mobility and more balanced charge carrier transport, which leads to an enhanced power conversion efficiency of 8.51% for C₆‐IDTT‐T‐based device with a high open‐circuit voltage of 1.052 V and a low energy loss of 0.60 eV.

中文翻译：

有机太阳能电池的不对称烷基取代的宽带隙非富勒烯受体

不对称的宽带隙（WBG）nonfullerene受体（C ₆ -IDTT-T）是通过从一个对称地烷基取代的indacenodithieno [3,2-剪切一个烷基侧链开发b ]的稠的噻吩（IDTT）芯环电子受体2C ₆ -IDTT-T。这两个受体都显示超过1.8 eV的宽光学带隙。进行了光学，电化学和活性层形态的研究，以了解不对称侧链对电和光伏性能的影响。与对称2C ₆ -IDTT-T相比，非对称C ₆ -IDTT-T被发现具有红移吸收和更高的电子迁移率。结果，C ₆‐IDTT-T与噻吩并噻吩-苯并二噻吩共聚物（PTB7-Th）的共混物具有更高的电子迁移率和更平衡的电荷载流子输运，这对于基于C ₆ -IDTT-T的C ₆ -IDTT-T器件，其功率转换效率提高了8.51％1.052 V的高开路电压和0.60 eV的低能量损耗。

更新日期：2020-03-01

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