A double-cable Y-series-based polymer acceptor for efficient all-polymer solar cells: a new strategy of polymerizing small molecule acceptors. Issue 10 (1st March 2023)

• Record Type: Journal Article
• Authors: Wu, Xiaohei; Cai, Shijie; Shen, Kexin; Chen, Mingxia; Wang, Tao; Zhao, Xinbi; Wang, Shanshan; Yang, Xinrong; Zhang, Meimei; Sun, Rui; Min, Jie
• Is Part Of: Journal of materials chemistry. Volume 11:Issue 10(2023)
• Page Start: 3533
• Page End: 3541
• Publication Date: 2023-03-01
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2tc04555a
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : In this work, we report a new design strategy to synthesize a double-cable polymer acceptor PT-BTP composed of a fused-ring Y-series acceptor framework as a pendant side unit and thiophene derivative as the conjugated backbone. Abstract : Further advancement of all-polymer solar cells (all-PSCs) requires a new polymerization design strategy to develop ideal polymer acceptors that possess and retain maximally the advantages of narrow bandgap non-fullerene acceptor building blocks. In this work, we report a new design strategy to synthesize a polymerized small molecule acceptor PT-BTP with a double-cable structure composed of a fused-ring Y-series acceptor framework as a pendant side unit and thiophene derivative as the conjugated backbone. PT-BTP exhibits a narrow optical bandgap of 1.35 eV and high electron mobility as well as a favorable BHJ blend morphology when blended with polymer donor PM6, resulting in good photovoltaic performance. The optimized PM6:PT-BTP all-PSCs displayed a high PCE of 12.13% with an energy loss ( E loss ) of 0.566 eV and a small non-radiative recombination loss (Δ E 3 ) of 0.227 eV. In contrast, the as-cast devices only showed a lower PCE of 8.14% with inferior E loss and Δ E 3 values. This work enables a new molecular design direction to construct narrow bandgap P A s toward successful applications in high-performance all-PSCs.