Abstract
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%.
Highlights
Triplet diffusion in singlet exciton fission sensitized pentacene solar cells Maxim Tabachnyk, Bruno Ehrler, Sam Bayliss, Richard H
We investigate the dynamics of triplet excitons resulting from singlet fission in pentacene and their ionization at a C60 heterojunction
We find the triplet diffusion length in polycrystalline pentacene to be 40 nm
Summary
Triplet diffusion in singlet exciton fission sensitized pentacene solar cells Maxim Tabachnyk, Bruno Ehrler, Sam Bayliss, Richard H. We have investigated these device structures and find that the P3HT layer can act as an effective antenna similar to work by Reusswig et al.,11 transferring singlet excitons to the pentacene layer with 30% efficiency, and we establish the triplet exciton diffusion range in the pentacene film, noting that previous estimations of the exciton diffusion length in pentacene did not take singlet exciton fission into account.12,13 a)Author to whom correspondence should be addressed.
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