Organic Solar Cells with Large Insensitivity to Donor Polymer Molar Mass across All Acceptor ClassesClick to copy article linkArticle link copied!
- Stephanie SamsonStephanie SamsonDepartment of Applied Physical Sciences, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United StatesMore by Stephanie Samson
- Jeromy RechJeromy RechDepartment of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United StatesMore by Jeromy Rech
- Lorena Perdigón-ToroLorena Perdigón-ToroInstitut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Straße 24-25, 14476 Potsdam-Golm, GermanyMore by Lorena Perdigón-Toro
- Zhengxing PengZhengxing PengDepartment of Physics and ORaCEL, North Carolina State University, Raleigh, North Carolina 27695, United StatesMore by Zhengxing Peng
- Safa ShoaeeSafa ShoaeeInstitut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Straße 24-25, 14476 Potsdam-Golm, GermanyMore by Safa Shoaee
- Harald AdeHarald AdeDepartment of Physics and ORaCEL, North Carolina State University, Raleigh, North Carolina 27695, United StatesMore by Harald Ade
- Dieter NeherDieter NeherInstitut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Straße 24-25, 14476 Potsdam-Golm, GermanyMore by Dieter Neher
- Martin StolterfohtMartin StolterfohtInstitut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Straße 24-25, 14476 Potsdam-Golm, GermanyMore by Martin Stolterfoht
- Wei You*Wei You*Email: [email protected]Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United StatesMore by Wei You
Abstract
![Abstract Image](/cms/10.1021/acsapm.0c01041/asset/images/medium/ap0c01041_0009.gif)
Donor polymer number-average molar mass (Mn) has long been known to influence organic photovoltaic (OPV) performance via changes in both the polymer properties and the resulting bulk heterojunction morphology. The exact nature of these Mn effects varies from system to system, although there is generally some intermediate Mn that results in optimal performance. Interestingly, our earlier work with the difluorobenzotriazole (FTAZ)-based donor polymer, paired with either N2200 (polymer acceptor) or PC61BM (fullerene acceptor), demonstrated <10% variation in power conversion efficiency and a consistent morphology over a large span of Mn (30 kg/mol to over 100 kg/mol). Would such insensitivity to polymer Mn still hold true when prevailing small molecular acceptors were used with FTAZ? To answer this question, we explored the impact of FTAZ Mn on OPVs with ITIC, a high-performance small-molecule fused-ring electron acceptor (FREA). By probing the photovoltaic characteristics of the resulting OPVs, we show that a similar FTAZ Mn insensitivity is also found in the FTAZ:ITIC system. This study highlights a single-donor polymer which, when paired with an archetypal fullerene, polymer, and FREA, results in systems that are largely insensitive to donor Mn. Our results may have implications in polymer batch-to-batch reproducibility, in particular, relaxing the need for tight Mn control during synthesis.
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