Linking Phase Behavior to Performance Parameters in Non-Fullerene Acceptor Solar Cells

Christina Cheng, Stephen Wong, Garrett LeCroy, Sebastian Schneider, Enrique Gomez, Michael F. Toney, Alberto Salleo

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Performance of nonfullerene-based organic solar cells is largely dependent on the donor:acceptor blend morphology, which is initially tuned by composition. However, morphological design rules are difficult to identify due to the complex relationship between composition-dependent phase behavior and performance properties. In this study, the authors are able to establish a direct link between PM6:Y6 film morphology and device properties by combining grazing-incidence wide-angle X-ray scattering with highly sensitive Fourier transform photocurrent spectroscopy. By analyzing properties across the full composition range, interfacial microstructure and the corresponding charge transfer (CT) states are identified and direct structure–property relationships are established. The results indicate that open-circuit voltage is controlled by the CT state at amorphous-PM6:crystalline-Y6 interfaces. Crystalline Y6 is found to increase both transport and non-radiative recombination, suggesting that morphological tradeoffs may be necessary for overall device optimization.

Original languageEnglish (US)
Article number2204297
JournalAdvanced Energy Materials
Volume13
Issue number16
DOIs
StatePublished - Apr 26 2023

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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