期刊
ADVANCED ENERGY MATERIALS
卷 8, 期 21, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201800451
关键词
charge-transfer states; nonradiative voltage losses; organic solar cells; triplet excited states
类别
资金
- German Federal Ministry for Education and Research (BMBF) through the InnoProfile project Organische p-i-n Bauelemente 2.2
- European Union's Horizon 2020 research and innovation programme under Marie Sklodowska Curie Grant [722651]
- German Research Foundation (DFG) [SFB 951]
- Fonds de la Recherche Scientifiques de Belgique [2.5020.11]
- Walloon Region [1117545]
The best organic solar cells (OSCs) achieve comparable peak external quantum efficiencies and fill factors as conventional photovoltaic devices. However, their voltage losses are much higher, in particular those due to nonradiative recombination. To investigate the possible role of triplet states on the donor or acceptor materials in this process, model systems comprising Zn- and Cu-phthalocyanine (Pc), as well as fluorinated versions of these donors, combined with C-60 as acceptor are studied. Fluorination allows tuning the energy level alignment between the lowest energy triplet state (T-1) and the charge-transfer (CT) state, while the replacement of Zn by Cu as the central metal in the Pcs leads to a largely enhanced spin-orbit coupling. Only in the latter case, a substantial influence of the triplet state on the nonradiative voltage losses is observed. In contrast, it is found that for a large series of typical OSC materials, the relative energy level alignment between T-1 and the CT state does not substantially affect nonradiative voltage losses.
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