Jia Zhenrong, Qin Shucheng, Meng Lei, Ma Qing, Angunawela Indunil, Zhang Jinyuan, Li Xiaojun, He Yakun, Lai Wenbin, Li Ning, Ade Harald, Brabec Christoph J, Li Yongfang
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, 100190, Beijing, China.
School of Chemical Science, University of Chinese Academy of Sciences, 100049, Beijing, China.
Nat Commun. 2021 Jan 8;12(1):178. doi: 10.1038/s41467-020-20431-6.
Tandem organic solar cells are based on the device structure monolithically connecting two solar cells to broaden overall absorption spectrum and utilize the photon energy more efficiently. Herein, we demonstrate a simple strategy of inserting a double bond between the central core and end groups of the small molecule acceptor Y6 to extend its conjugation length and absorption range. As a result, a new narrow bandgap acceptor BTPV-4F was synthesized with an optical bandgap of 1.21 eV. The single-junction devices based on BTPV-4F as acceptor achieved a power conversion efficiency of over 13.4% with a high short-circuit current density of 28.9 mA cm. With adopting BTPV-4F as the rear cell acceptor material, the resulting tandem devices reached a high power conversion efficiency of over 16.4% with good photostability. The results indicate that BTPV-4F is an efficient infrared-absorbing narrow bandgap acceptor and has great potential to be applied into tandem organic solar cells.
串联有机太阳能电池基于将两个太阳能电池单片连接的器件结构，以拓宽整体吸收光谱并更有效地利用光子能量。在此，我们展示了一种简单的策略，即在小分子受体Y6的中心核与端基之间插入一个双键，以延长其共轭长度和吸收范围。结果，合成了一种新的窄带隙受体BTPV-4F，其光学带隙为1.21 eV。以BTPV-4F作为受体的单结器件实现了超过13.4%的功率转换效率，短路电流密度高达28.9 mA cm。采用BTPV-4F作为背电池受体材料时，所得串联器件达到了超过16.4%的高功率转换效率，且具有良好的光稳定性。结果表明，BTPV-4F是一种高效的红外吸收窄带隙受体，在应用于串联有机太阳能电池方面具有巨大潜力。
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