Abstract:
:Generation and recombination of electrons and holes in organic solar cells occurs via charge transfer states located at the donor/acceptor interface. The energy of these charge transfer states is a crucial factor for the attainable open-circuit voltage and its correct determination is thus of utmost importance for a detailed understanding of such devices. This work reports on drastic changes of electroluminescence spectra of bulk heterojunction organic solar cells upon variation of the absorber layer thickness. It is shown that optical thin-film effects have a large impact on optical out-coupling of luminescence radiation for devices made from different photoactive materials, in configurations with and without indium tin oxide. A scattering matrix approach is presented which accurately reproduces the observed effects and thus delivers the radiative recombination spectra corrected for the wavelength-dependent out-coupling. This approach is proven to enable the correct determination of charge transfer state energies.
journal_name
Nat Communjournal_title
Nature communicationsauthors
List M,Sarkar T,Perkhun P,Ackermann J,Luo C,Würfel Udoi
10.1038/s41467-018-05987-8subject
Has Abstractpub_date
2018-09-07 00:00:00pages
3631issue
1issn
2041-1723pii
10.1038/s41467-018-05987-8journal_volume
9pub_type
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