Journal article

Morphological Requirements for Nanoscale Electric Field Buildup in a Bulk Heterojunction Solar Cell

Kyra N Schwarz, Valerie D Mitchell, Saeed-Uz-Zaman Khan, Calvin Lee, Adam Reinhold, Trevor A Smith, Kenneth P Ghiggino, David J Jones, Barry P Rand, Gregory D Scholes

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | AMER CHEMICAL SOC | Published : 2021

Abstract

The morphology of organic semiconductors is critical to their function in optoelectronic devices and is particularly crucial in the donor-acceptor mixture that comprises the bulk heterojunction of organic solar cells. Here, energy landscapes can play integral roles in charge photogeneration, and recently have been shown to drive the accumulation of charge carriers away from the interface, resulting in the buildup of large nanoscale electric fields, much like a capacitor. In this work we combine morphological and spectroscopic data to outline the requirements for this interdomain charge accumulation, finding that this effect is driven by a three-phase morphology that creates an energetic casc..

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Grants

Awarded by U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences Solar Photochemistry program


Awarded by ARC Centre of Excellence in Exciton Science


Awarded by U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering


Funding Acknowledgements

G.D.S. and K.N.S. acknowledge support by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences Solar Photochemistry program, under Award Number DE-SC0015429. K.N.S., K.P.G., and T.A.S. acknowledge support from the ARC Centre of Excellence in Exciton Science (CE170100026). S.U.Z.K. and B.P.R. acknowledge funding from the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under Award Number DE-SC0012458. This work was made possible by support from the Australian Renewable Energy Agency, which funds the project grants within the Australian Centre for Advanced Photovoltaics. GIWAXS and GISAXS were performed at the SAXS/WAXS beamline of the Australian Synchrotron. K.N.S. thanks Bryan Kudisch for helpful discussions.