Publication date: 15th December 2025
Polymer solar cells (PSCs) have been considered as a promising photovoltaic technology for sustainable energy harvesting owing to their flexibility, low cost, and potential for large-scale applications. The development of non-fullerene acceptors has enabled PSCs to achieve a power conversion efficiency exceeding 21%, highlighting the excellent industrial potential of this emerging solar technology. Despite these efficiency gains, the long-term stability of PSCs remains a significant challenge that hinders their commercial viability.
The research team in SINANO has been working on the intrinsic degradation mechanisms of polymer solar cells under light, heat and electric field stress. Especially, we recently developed a spectroscopic method to characterize the chemical components of the polymer blends quantitatively and demonstrated that the non-fullerene acceptor-based polymer blends are intrinsically thermally stable.[1-2] While the unexpected interfacial degradation at the photoactive layer/MoO3 interface is responsible for the thermal degradation of polymer:non-fullerene solar cells.[3-4] By proper interfacial protection of the anode interfaces, the cells showed an excellent thermal stability under 85 °C or even 150 °C thermal annealing, that enables the excellent tolerance over damp-heat and thermal cycling tests.[5] Our findings underscore the effectiveness of our approach and provide valuable insights for the design of more stable polymer solar cells.
The author would like to acknowledge the financial support from the National Natural Science Foundation of China (No. 22075315, 22579185), and the Chinese Academy of Sciences grant number YJKYYQ20180029 (C.-Q.M.). I am also grateful for the technical support from the Suzhou Institute of Nano-Tech and Nano-Bionics for the GIWAXS and TOF-SIMS testing in Nano-X.
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