Synergistic Interplay between Asymmetric Backbone Conformation, Molecular Aggregation, and Charge-Carrier Dynamics in Fused-Ring Electron Acceptor-Based Bulk Heterojunction Solar Cells
| العنوان: | Synergistic Interplay between Asymmetric Backbone Conformation, Molecular Aggregation, and Charge-Carrier Dynamics in Fused-Ring Electron Acceptor-Based Bulk Heterojunction Solar Cells |
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| المؤلفون: | Linqiang Yang, Renjun Guo, Xin Song, Guichuan Xing, Zhipeng Kan, Ao Zhang, Xinyu Jiang, Suo Tu, Qi Wei, Peter Müller-Buschbaum, Weihua Tang, Licheng Hou |
| المصدر: | ACS Applied Materials & Interfaces. 13:2961-2970 |
| بيانات النشر: | American Chemical Society (ACS), 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | chemistry.chemical_classification, Materials science, Organic solar cell, Electron donor, 02 engineering and technology, Electron acceptor, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Polymer solar cell, 0104 chemical sciences, chemistry.chemical_compound, Dipole, chemistry, Chemical physics, Molecule, General Materials Science, Lamellar structure, Charge carrier, 0210 nano-technology |
| الوصف: | Asymmetric fused-ring electron acceptors (a-FREAs) have proved to be a promising type of electron acceptor for high-performance organic solar cells (OSCs). However, the relationship among molecular structures of a-FREAs and their nanoscale morphology, charge-carrier dynamics, and device performance remains unclear. In this contribution, two FREAs differing in conjugated backbone geometry with an asymmetric conformation (IPT-2F) or symmetric one (INPIC-2F) are selected to systematically explore the superiorities of the asymmetric conformation. Despite the frailer extinction coefficient and weaker crystallinity, IPT-2F shows stronger dipole interactions in the asymmetrical backbone, which would induce a closer lamellar packing than that of the symmetrical counterpart. Using PBDB-T as the electron donor, the IPT-2F-based OSCs achieve the best power conversion efficiency of 14.0%, which is ca. 67% improvement compared to the INPIC-2F-based ones (8.37%), resulting from a simultaneously increased short-circuited current density (Jsc) and fill factor. Systematical investigations on optoelectronic and morphological properties show that the asymmetric conformation-structured IPT-2F exhibits better miscibility with the polymer donor to induce a favorable blend ordering with small domain sizes and suitable phase separation compared to the INPIC-2F symmetric molecule. This facilitates an efficient charge generation and transport, inhibits charge-carrier recombination, and promotes valid charge extraction in IPT-2F-based devices. |
| تدمد: | 1944-8252 1944-8244 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4557551c6011348b51b990fccbaff222 https://doi.org/10.1021/acsami.0c19700 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi.dedup.....4557551c6011348b51b990fccbaff222 |
| قاعدة البيانات: | OpenAIRE |
Find this issue from the American Chemical Society | تدمد: | 19448252 19448244 |
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