Coherent spin mixing at charge transfer states for spin polaron pair dissociation and energy loss in organic bulk heterojunction solar cells
Abstract Balancing the high photocurrent production and the nonradiative recombination suppression is of practical importance to design high-performance organic bulk heterojunction (BHJ) solar cells. Most efforts in this field have been directed towards the understanding of the electronic charge and...
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Nature Portfolio
2025-01-01
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| Series: | Communications Physics |
| Online Access: | https://doi.org/10.1038/s42005-025-01967-9 |
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| author | Lixuan Kan Fenggui Zhao Jiashuo Zhang Jiaji Hu Yongchao Xie Jing Li Xixiang Zhu Xiaoling Ma Haomiao Yu Jinpeng Li Fujun Zhang Kai Wang |
| author_facet | Lixuan Kan Fenggui Zhao Jiashuo Zhang Jiaji Hu Yongchao Xie Jing Li Xixiang Zhu Xiaoling Ma Haomiao Yu Jinpeng Li Fujun Zhang Kai Wang |
| author_sort | Lixuan Kan |
| collection | DOAJ |
| description | Abstract Balancing the high photocurrent production and the nonradiative recombination suppression is of practical importance to design high-performance organic bulk heterojunction (BHJ) solar cells. Most efforts in this field have been directed towards the understanding of the electronic charge and photogenerated exciton related optoelectronic and transient processes. Little is known about the spin polaron pairs (PPs) dependent dissociation and nonradiative decay at charge transfer states (CTS), where the coherent spin mixing plays a key role. In this work, we combine magneto-photocurrent (MPC) and coherent spin mixing analyses for the IT- and Y-series, i.e., prototypical nonfullerene acceptors (NFA), based organic BHJ systems. We find that increasing polaron pair dissociation rates at singlet charge transfer states (CTS)S give rise to the photocurrent generation. Within the same systems, strong internal fields that include the hyperfine (HF) fields, spin-orbit coupling (SOC), and Δg value may promote the intersystem crossing (ISC) and the polaron back transfer (PBT), leading to the energy loss. By exploring the impact of the coherent spin mixing on the molecular functionality, our study opens new directions for improving photovoltaic performance of BHJ systems. |
| format | Article |
| id | doaj-art-2e900d1c4f5b49ab8f06a104de5297f7 |
| institution | Kabale University |
| issn | 2399-3650 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Communications Physics |
| spelling | doaj-art-2e900d1c4f5b49ab8f06a104de5297f72025-02-02T12:28:01ZengNature PortfolioCommunications Physics2399-36502025-01-018111110.1038/s42005-025-01967-9Coherent spin mixing at charge transfer states for spin polaron pair dissociation and energy loss in organic bulk heterojunction solar cellsLixuan Kan0Fenggui Zhao1Jiashuo Zhang2Jiaji Hu3Yongchao Xie4Jing Li5Xixiang Zhu6Xiaoling Ma7Haomiao Yu8Jinpeng Li9Fujun Zhang10Kai Wang11Key Laboratory of Luminescence and Optical Information, Ministry of Education, School of Physical Science and Engineering, Beijing Jiaotong UniversityKey Laboratory of Luminescence and Optical Information, Ministry of Education, School of Physical Science and Engineering, Beijing Jiaotong UniversityKey Laboratory of Luminescence and Optical Information, Ministry of Education, School of Physical Science and Engineering, Beijing Jiaotong UniversityKey Laboratory of Luminescence and Optical Information, Ministry of Education, School of Physical Science and Engineering, Beijing Jiaotong UniversityKey Laboratory of Luminescence and Optical Information, Ministry of Education, School of Physical Science and Engineering, Beijing Jiaotong UniversityKey Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of SciencesKey Laboratory of Luminescence and Optical Information, Ministry of Education, School of Physical Science and Engineering, Beijing Jiaotong UniversityKey Laboratory of Luminescence and Optical Information, Ministry of Education, School of Physical Science and Engineering, Beijing Jiaotong UniversityKey Laboratory of Luminescence and Optical Information, Ministry of Education, School of Physical Science and Engineering, Beijing Jiaotong UniversityKey Laboratory of Luminescence and Optical Information, Ministry of Education, School of Physical Science and Engineering, Beijing Jiaotong UniversityKey Laboratory of Luminescence and Optical Information, Ministry of Education, School of Physical Science and Engineering, Beijing Jiaotong UniversityKey Laboratory of Luminescence and Optical Information, Ministry of Education, School of Physical Science and Engineering, Beijing Jiaotong UniversityAbstract Balancing the high photocurrent production and the nonradiative recombination suppression is of practical importance to design high-performance organic bulk heterojunction (BHJ) solar cells. Most efforts in this field have been directed towards the understanding of the electronic charge and photogenerated exciton related optoelectronic and transient processes. Little is known about the spin polaron pairs (PPs) dependent dissociation and nonradiative decay at charge transfer states (CTS), where the coherent spin mixing plays a key role. In this work, we combine magneto-photocurrent (MPC) and coherent spin mixing analyses for the IT- and Y-series, i.e., prototypical nonfullerene acceptors (NFA), based organic BHJ systems. We find that increasing polaron pair dissociation rates at singlet charge transfer states (CTS)S give rise to the photocurrent generation. Within the same systems, strong internal fields that include the hyperfine (HF) fields, spin-orbit coupling (SOC), and Δg value may promote the intersystem crossing (ISC) and the polaron back transfer (PBT), leading to the energy loss. By exploring the impact of the coherent spin mixing on the molecular functionality, our study opens new directions for improving photovoltaic performance of BHJ systems.https://doi.org/10.1038/s42005-025-01967-9 |
| spellingShingle | Lixuan Kan Fenggui Zhao Jiashuo Zhang Jiaji Hu Yongchao Xie Jing Li Xixiang Zhu Xiaoling Ma Haomiao Yu Jinpeng Li Fujun Zhang Kai Wang Coherent spin mixing at charge transfer states for spin polaron pair dissociation and energy loss in organic bulk heterojunction solar cells Communications Physics |
| title | Coherent spin mixing at charge transfer states for spin polaron pair dissociation and energy loss in organic bulk heterojunction solar cells |
| title_full | Coherent spin mixing at charge transfer states for spin polaron pair dissociation and energy loss in organic bulk heterojunction solar cells |
| title_fullStr | Coherent spin mixing at charge transfer states for spin polaron pair dissociation and energy loss in organic bulk heterojunction solar cells |
| title_full_unstemmed | Coherent spin mixing at charge transfer states for spin polaron pair dissociation and energy loss in organic bulk heterojunction solar cells |
| title_short | Coherent spin mixing at charge transfer states for spin polaron pair dissociation and energy loss in organic bulk heterojunction solar cells |
| title_sort | coherent spin mixing at charge transfer states for spin polaron pair dissociation and energy loss in organic bulk heterojunction solar cells |
| url | https://doi.org/10.1038/s42005-025-01967-9 |
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