Organic Photovoltaic Performance Resiliency: Role of Molecular Weight in a PM7 Derivative
Schopp N. Sabury S. Chaney T. Zhang J. Wakidi H. Kim B.M. Sankar R. Luong H.M. Therdkatanyuphong P. Brus V.V. Marder S. Toney M.F. Reynolds J.R. Nguyen T.-Q.
11 August 2023American Chemical Society
ACS Energy Letters
2023#8Issue 83307 - 3313 pp.
Batch-to-batch variations remain a challenge for organic photovoltaics (OPVs) that must be solved for widespread commercialization. This work addresses the role of the molecular weight (MW), introducing a new donor polymer PM7-D5 with an extended thiophene bridge compared to that of PM6 or PM7. Devices comprising PM7-D5 and the nonfullerene acceptor L8-BO are relatively insensitive to a significant molecular weight variation and result in OPVs with photoconversion efficiencies (PCEs) of 11.4% and 12.4%, when using polymers with 26 and 125 kDa. We elucidate the origins of the small performance change and systematically address morphology, charge generation, recombination, and extraction, combining optical simulations and experimental techniques. The comprehensive analysis emphasizes the complexity of the photoelectric processes and confirms the high robustness to MW variations of this blend system. Lastly, we review reported blends and suggest systematic research of the structural parameters that lead to an increased robustness to MW changes.
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Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California Santa Barbara (UCSB), Santa Barbara, 93106, CA, United States
School of Chemistry and Biochemistry, School of Materials Science and Engineering, Center for Organic Photonics and Electronics, Georgia Tech Polymer Network, Georgia Institute of Technology, Atlanta, 30332, GA, United States
Materials Science and Engineering, University of Colorado, Boulder, 80309, CO, United States
Department of Chemical and Biological Engineering, University of Colorado, Boulder, 80309, CO, United States
Renewable and Sustainable Energy Institute, University of Colorado Boulder, Boulder, 80303, CO, United States
Department of Physics, School of Sciences and Humanities, Nazarbayev University, Astana, 010000, Kazakhstan
Center for Polymers and Organic Solids
School of Chemistry and Biochemistry
Materials Science and Engineering
Department of Chemical and Biological Engineering
Renewable and Sustainable Energy Institute
Department of Physics
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