Solution-Processable Singlet Fission Photovoltaic Devices

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DOI http://dx.doi.org/10.1021/nl503650a
Reference L. Yang, M. Tabachnyk, S.L. Bayliss, M.L. Böhm, K. Broch, N.C. Greenham, R.H. Friend and B. Ehrler, Solution-Processable Singlet Fission Photovoltaic Devices, Nano Lett. 15, 1: 354-358 (2015)
Group Hybrid Solar Cells

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%.