We demonstrate the successful incorporation of a solution-processable singlet fission material, 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene), into photovoltaic devices. TIPS-pentacene rapidly converts high-energy singlet excitons into pairs of triplet excitons via singlet fission, potentially doubling the photocurrent from high-energy photons. Low-energy photons are captured by small-bandgap electron-accepting lead chalcogenide nanocrystals. This is the first solution-processable singlet fission system that performs with substantial efficiency with maximum power conversion efficiencies exceeding 4.8%, and external quantum efficiencies of up to 60% in the TIPS-pentacene absorption range. With PbSe nanocrystal of suitable bandgap, its internal quantum efficiency reaches 170 ± 30%.

Nano Lett.
Hybrid Solar Cells

Yang, L., Tabachnyk, M., Bayliss, S. L., Böhm, M., Broch, K., Greenham, N., … Ehrler, B. (2015). Solution-Processable Singlet Fission Photovoltaic Devices. Nano Lett., 15(1), 354–358. doi:10.1021/nl503650a