DataVXACS Energy LettersPaper
journal article·2023-08-11

Organic Photovoltaic Performance Resiliency: Role of Molecular Weight in a PM7 Derivative

Nora Schopp, Sina Sabury, Thomas Chaney, Junxiang Zhang, Hiba Wakidi, Brian M. Kim, Rahul Sankar, Hoang M. Luong, Pattarawadee Therdkatanyuphong, Viktor V. Brus, Seth Marder, Michael F. Toney, John R. Reynolds, Thuc-Quyen Nguyen

ACS Energy Letters· Volume 8· Issue 8
Publisher page
Source abstract

Abstract

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.
Source: openalex_inverted_index · Quality: baseline

Research context

PolymersElectronic materials

OpenAlex topics: Organic Electronics and Photovoltaics · Perovskite Materials and Applications · Conducting polymers and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California Santa Barbara (UCSB), Santa Barbara, California 93106, 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, Georgia 30332, United States

Materials Science and Engineering, University of Colorado, Boulder, Colorado 80309, United States

Renewable and Sustainable Energy Institute, University of Colorado Boulder, Boulder, Colorado 80303, United States

Department of Physics, School of Sciences and Humanities, Nazarbayev University, 010000 Astana, Republic of Kazakhstan

Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80309, United States

Funding

Link Foundation · Division of Graduate Education · Office of Naval Research · Division of Materials Research · Nazarbayev University

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