期刊
NANO ENERGY
卷 101, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2022.107574
关键词
Alkyl-chainengineering; Y6-seriesacceptors; Verticalphaseseparation; Non-halogensolvent; Invertedorganicsolarcells
类别
资金
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT (MSIT) [2021R1A2C3004420, 2021R1A2C2091787, 2020M3H4A1A02084908, 2020M3H4A3081813]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) [20183010013820]
- Korea Research Institute of Chemical Technology (KRICT) [KS2022-00]
- Ministry of Science & ICT (MSIT), Republic of Korea [KS2022-00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2021R1A2C2091787] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this study, the branched alkyl chains of the Y6 molecule were fine-tuned to improve the morphological properties and photovoltaic performance of organic solar cells. The modification of the alkyl chains allowed for the formation of an optimized bulk heterojunction morphology, leading to higher power conversion efficiency and fill factor in inverted device architectures.
Organic solar cells (OSCs) have entered a new phase of development with the advent of a high-performance non-fullerene acceptor known as Y6. Considering that the molecular curvature shape of Y6 allows for dense inter-molecular packing with a grid-like packing structure, the modification of branched alkyl chains located on the pyrrole motif of Y6 is expected to have a significant impact on morphological properties, such as molecular packing/orientation behavior and vertical phase separation. In this work, we fine-tune the branched alkyl chain attached to nitrogen atoms of the Y6 main backbone and systematically investigate the relationship between the morphological features and photovoltaic performance of OSCs with a PM6 donor polymer. The systematic alkyl chain engineering effectively reduces the aggregation of Y6-analogs and substantially improves solubility, thereby providing solution processability in a non-halogenated solvent. Additional in-depth analyses reveal that the modification of branched alkyl chains allows the formation of an optimized bulk heterojunction morphology, which is advantageous for an inverted device architecture. In particular, the PM6:Y6-HU-based inverted OSC utilizing o-xylene as a processing solvent achieves a power conversion efficiency of 17.4% with an outstanding fill factor of 77.9 % under the binary blend system and single non-halogen solvent processing.
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