An asymmetric wide-bandgap acceptor simultaneously enabling highly efficient single-junction and tandem organic solar cells. Issue 4 (7th March 2022)

• Record Type: Journal Article
• Authors: Wang, Jianqiu; Zhang, Maojie; Lin, Ji; Zheng, Zhong; Zhu, Lei; Bi, Pengqing; Liang, Haiyan; Guo, Xia; Wu, Jingnan; Wang, Yafei; Yu, Linfeng; Li, Jiayao; Lv, Junfang; Liu, Xiaoyu; Liu, Feng; Hou, Jianhui; Li, Yongfang
• Is Part Of: Energy & environmental science. Volume 15:Issue 4(2022)
• Page Start: 1585
• Page End: 1593
• Publication Date: 2022-03-07
• Subjects: Energy conversion -- Periodicals; Fuel switching -- Periodicals; Environmental sciences -- Periodicals; Environmental chemistry -- Periodicals; 333.79
• DOI: 10.1039/d1ee03673d
• Languages: English
• ISSNs: 1754-5692

Abstract

Abstract : An asymmetric wide-bandgap acceptor, namely AITC, is synthesized. The large dipole moment of AITC reinforces the molecular packing in ternary blends. Single-junction and tandem OSCs yielded a remarkable PCE of 18.8% and 19.4%, respectively. Abstract : Ternary and tandem strategies are effective methods for improving the photovoltaic performance of organic solar cells (OSCs). Here an asymmetric wide-bandgap nonfullerene acceptor named AITC is synthesized. AITC with a bandgap of 1.75 eV exhibits a good complementary absorption spectrum with the narrow bandgap acceptor BTP-eC9. AITC also shows good miscibility with BTP-eC9, which facilitates the formation of a stable mixing phase in blends. Moreover, the large dipole moment of AITC reinforces the molecular packing in the blend films of PM6 and BTP-eC9, thereby enhancing the photoconductivity, suppressing charge recombination and reducing nonradiative voltage loss in ternary OSCs. As a result, the ternary OSCs based on PM6:BTP-eC9:AITC achieve an outstanding power conversion efficiency (PCE) of 18.8%. In addition, tandem OSCs using PM6:AITC as a bottom subcell and the PM6:AITC:BTP-eC9 ternary active layer as a top subcell exhibit a remarkable efficiency of 19.4%, which is one of the highest PCEs in the field.