Backbone rigidity promoting hole delocalization and enabling efficient charge generation with minimal voltage loss in nonfullerene organic photovoltaics
Shota Suruga·Itaru Osaka·Yuki Sato·Kazuki Kohzuki·Jihun Jeon·Hyung Do Kim·Shin Inamoto·Hiroyuki Ishii·Kyohei Nakano·Keisuke Tajima·Hideo Ohkita·Tsubasa Mikie
Achieving both low voltage loss and efficient charge generation remains a major challenge in advancing high-performance organic photovoltaics (OPVs). Here, we show that photovoltaic cells using PTNT1-F—a dithienonaphthobisthiadiazole (TNT)-based polymer recently developed by our group—exhibit a notably low nonradiative voltage loss (∆Vnr) of 0.18 V, suggesting a minimal driving force for charge generation. Remarkably, when combined with a nonfullerene acceptor Y12, the PTNT1-F device achieved hi