Advanced Science • Vol 12 • No 12
Small Singlet–Triplet Gap Terpolymer Donor with a Simple Pt Complex Enables Organic Solar Cells with Low Energy Loss and Over 19.2% Efficiency
February 2025 • Dou Luo, Lifu Zhang, Lanqing Li, Tingting Dai, Erjun Zhou, Mao Quan, Hongyang Zhang, Aung Ko Ko Kyaw, Wai‐Yeung Wong
Abstract Suppressing the non‐radiative loss in the organic solar cells (OSCs) through molecular design remains a significant challenge. Typically, triplet state of organic semiconductors is lower than the charge transfer (CT) state, contributing to substantial non‐radiative loss via the triplet state. Herein, a set of terpolymers is prepared by introducing a simple Pt complex block into the PM6 polymer backbone. These metalated terpolymers exhibit high triplet energy ( E T1 ) and small singlet–triplet energy gap (…