Long‐Term Thermal Stability of High‐Efficiency Polymer Solar Cells Based on Photocrosslinkable Donor‐Acceptor Conjugated Polymers

Highly efficient polymer solar cells based on novel photocrosslinkable donor–acceptor conjugated polymers are fabricated and their long-term thermal stability is reported. After 72 h of thermal annealing at 150 °C, a stable power conversion efficiency as high as 4.7% is maintained. The control of active layer morphology and device performance through annealing is correlated with the synthetic design of the photocrosslinkable polymer.