Mediated Non-geminate Recombination in Ternary Organic Solar Cells Through a Liquid Crystal Guest Donor
The approach via ternary blends prompts the increase of absorbed photon density and resultant photocurrent enhancement in organic solar cells (OSCs). In contrast to actively reported high efficiency ternary OSCs, little is known about charge recombination properties and carrier loss mechanisms in th...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2020-02-01
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| Series: | Frontiers in Chemistry |
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| Online Access: | https://www.frontiersin.org/article/10.3389/fchem.2020.00021/full |
| _version_ | 1819268251816820736 |
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| author | Ao Yin Dongyang Zhang Jianqiu Wang Huiqiong Zhou Zhiqiang Fu Yuan Zhang |
| author_facet | Ao Yin Dongyang Zhang Jianqiu Wang Huiqiong Zhou Zhiqiang Fu Yuan Zhang |
| author_sort | Ao Yin |
| collection | DOAJ |
| description | The approach via ternary blends prompts the increase of absorbed photon density and resultant photocurrent enhancement in organic solar cells (OSCs). In contrast to actively reported high efficiency ternary OSCs, little is known about charge recombination properties and carrier loss mechanisms in these emerging devices. Here, through introducing a small molecule donor BTR as a guest component to the PCE-10:PC71BM binary system, we show that photocarrier losses via recombination are mitigated with respect the binary OSCs, owing to a reduced bimolecular recombination. The gain of the fill factor in ternary devices are reconciled by the change in equilibrium between charge exaction and recombination in the presence of BTR toward the former process. With these modifications, the power conversion efficiency in ternary solar cells receives a boost from 8.8 (PCE-10:PC71BM) to 10.88%. We further found that the voltage losses in the ternary cell are slightly suppressed, related to the rising charge transfer-state energy. These benefits brought by the third guest donor are important for attaining improvements on key photophysical processes governing the photovoltaic efficiencies in organic ternary solar cells. |
| first_indexed | 2024-12-23T21:30:06Z |
| format | Article |
| id | doaj.art-a2ed7bc5001c446e8ad47f33a863cb9f |
| institution | Directory Open Access Journal |
| issn | 2296-2646 |
| language | English |
| last_indexed | 2024-12-23T21:30:06Z |
| publishDate | 2020-02-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Chemistry |
| spelling | doaj.art-a2ed7bc5001c446e8ad47f33a863cb9f2022-12-21T17:30:29ZengFrontiers Media S.A.Frontiers in Chemistry2296-26462020-02-01810.3389/fchem.2020.00021505479Mediated Non-geminate Recombination in Ternary Organic Solar Cells Through a Liquid Crystal Guest DonorAo Yin0Dongyang Zhang1Jianqiu Wang2Huiqiong Zhou3Zhiqiang Fu4Yuan Zhang5School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, ChinaSchool of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, ChinaSchool of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, ChinaCAS Key Laboratory of Nanosystem and Hierachical Fabrication CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, ChinaSchool of Engineering and Technology, China University of Geosciences, Beijing, ChinaSchool of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, ChinaThe approach via ternary blends prompts the increase of absorbed photon density and resultant photocurrent enhancement in organic solar cells (OSCs). In contrast to actively reported high efficiency ternary OSCs, little is known about charge recombination properties and carrier loss mechanisms in these emerging devices. Here, through introducing a small molecule donor BTR as a guest component to the PCE-10:PC71BM binary system, we show that photocarrier losses via recombination are mitigated with respect the binary OSCs, owing to a reduced bimolecular recombination. The gain of the fill factor in ternary devices are reconciled by the change in equilibrium between charge exaction and recombination in the presence of BTR toward the former process. With these modifications, the power conversion efficiency in ternary solar cells receives a boost from 8.8 (PCE-10:PC71BM) to 10.88%. We further found that the voltage losses in the ternary cell are slightly suppressed, related to the rising charge transfer-state energy. These benefits brought by the third guest donor are important for attaining improvements on key photophysical processes governing the photovoltaic efficiencies in organic ternary solar cells.https://www.frontiersin.org/article/10.3389/fchem.2020.00021/fullternary solar cellscharge recombinationcharge transfer statessmall molecule donorvoltage loss |
| spellingShingle | Ao Yin Dongyang Zhang Jianqiu Wang Huiqiong Zhou Zhiqiang Fu Yuan Zhang Mediated Non-geminate Recombination in Ternary Organic Solar Cells Through a Liquid Crystal Guest Donor Frontiers in Chemistry ternary solar cells charge recombination charge transfer states small molecule donor voltage loss |
| title | Mediated Non-geminate Recombination in Ternary Organic Solar Cells Through a Liquid Crystal Guest Donor |
| title_full | Mediated Non-geminate Recombination in Ternary Organic Solar Cells Through a Liquid Crystal Guest Donor |
| title_fullStr | Mediated Non-geminate Recombination in Ternary Organic Solar Cells Through a Liquid Crystal Guest Donor |
| title_full_unstemmed | Mediated Non-geminate Recombination in Ternary Organic Solar Cells Through a Liquid Crystal Guest Donor |
| title_short | Mediated Non-geminate Recombination in Ternary Organic Solar Cells Through a Liquid Crystal Guest Donor |
| title_sort | mediated non geminate recombination in ternary organic solar cells through a liquid crystal guest donor |
| topic | ternary solar cells charge recombination charge transfer states small molecule donor voltage loss |
| url | https://www.frontiersin.org/article/10.3389/fchem.2020.00021/full |
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