Chloroboron (III) subnaphthalocyanine as an electron donor in bulk heterojunction photovoltaic cells

In this work, chloroboron (III) subnaphthalocyanine (SubNc) was used as an electron donor, combined with a [6,6]-phenyl-C 71 -butyric acid methyl ester (PC 70 BM) or fullerene C 70 acceptor in bulk heterojunction photovoltaic cells. In spite of the limited solubility of SubNc in organic solvents, the solution processed device exhibited an efficiency of 4.0% under 1 sun, AM1.5G solar irradiation at room temperature, and 5.0% at 80 ° C due to the temperature-dependence of the carrier mobilities. SubNc:C 70 bulk heterojunctions were also fabricated via thermal co-evaporation, demonstrating an efficiency of 4.4%. This result shows that SubNc is a promising material for photovoltaic applications via various processing techniques, such as vacuum deposition and wet coating.

Guo Chen, Hisahiro Sasabe, Takeshi Sano, Xiao-Feng Wang, Ziruo Hong, Junji Kido and Yang Yang

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