Source abstract
Abstract
Abstract Solvent additive engineering has been regarded as the most common and effective approach to finely tune the bulk heterojunction (BHJ) morphology of organic solar cells (OSCs). However, most conventional solvent additives are environmentally unfriendly and difficult to completely remove due to their toxicity and high boiling points. Herein, isopropanol (IPA) is first reported as a green solvent additive to significantly improve the photovoltaic performance of OSCs. Notably, the addition of IPA can facilitate the formation of highly ordered molecular stacking and suppress charge recombination in OSCs through precisely modulating molecular aggregation behaviors during film formation. As a result, the IPA processed PM6:BTP‐eC9‐based OSC yields an impressive power conversion efficiency (PCE) of 20.0%, which is much higher than 18.2% for that without additives. Furthermore, the all‐green‐solvent processed OSCs based on PM6:BTP‐eC9‐4ClO with o‐xylene as the main solvent and IPA as an additive achieve a high PCE of 19.4%. With the combined high device efficiency, excellent generality and improved eco‐compatibility, the morphology control strategy with IPA as an additive provides a new promising route toward commercial OSC technology.
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Research context
OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Perovskite Materials and Applications
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Affiliations
State Key Laboratory and Institute of Elemento‐Organic Chemistry Frontiers Science Center for New Organic Matter Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials Renewable Energy Conversion and Storage Center (RECAST) College of Chemistry Nankai University Tianjin 300071 China
State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China
CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100049 China
Laboratory of Advanced Optoelectronic Materials College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 China
Funding
National Key Research and Development Program of China · National Natural Science Foundation of China
References (35)
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