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Triplet diffusion in singlet exciton fission sensitized pentacene solar cells

2013; American Institute of Physics; Volume: 103; Issue: 15 Linguagem: Inglês

10.1063/1.4824420

1520-8842

Maxim Tabachnyk, Bruno Ehrler, Sam L. Bayliss, Richard H. Friend, Neil C. Greenham,

Nanowire Synthesis and Applications

Singlet fission sensitized photovoltaics have the potential to surpass the Shockley-Queisser limit for a single-junction structure. We investigate the dynamics of triplet excitons resulting from singlet fission in pentacene and their ionization at a C60 heterojunction. We model the generation and diffusion of excitons to predict the spectral response. We find the triplet diffusion length in polycrystalline pentacene to be 40 nm. Poly(3-hexylthiophene) between the electrode and pentacene works both to confine triplet excitons and also to transfer photogenerated singlet excitons into pentacene with 30% efficiency. The lower bound for the singlet fission quantum efficiency in pentacene is 180 ± 15%.