Increasing the fill factor of inverted polymer bulk heterojunction solar cells by doping PVP modified NaYF₄ nanoparticles

ABSTRACT

NaYF₄ nanoparticles (NPs), synthesized by a facile solvothermal approach using polyvinylpyrrolidone (PVP) as a surfactant, were doped into P3HT:PCBM blend to fabricate inverted polymer bulk heterojunction solar cells. The results showed that the fill factor (FF) of the device was greatly enhanced by doping NaYF₄ NPs/PVP composites into the active layer. There were evidences that PVP can form charge transfer (CT) complexes with PCBM. And the CT complexes, formed by PCBM and PVP carried by NaYF₄ NPs, might make contributions to the phase separation of the active layer (P3HT:PCBM blend), which is vital to the FF of the devices.

KEYWORDS:

• Fill factor
• charge transfer
• polymer solar cells

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11574110, 11447194), Project of Statistic Analysis of Gas Sensitive Materials, Opened Fund of the State Key Laboratory on Applied Optics, and Scientific Research Fund of Jilin Provincial Education Department (2015437).