Enhanced charge separation by interchain hole delocalization in nonfullerene acceptor‐based bulk heterojunction materials
Abstract Bulk heterojunction (BHJ) composites show improved power conversion efficiencies when optimized in terms of morphology using various film processing methods. A reduced carrier recombination loss in an optimized BHJ was characterized previously. However, the driving force that leads to this...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2023-07-01
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| Series: | Carbon Energy |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/cey2.302 |
| _version_ | 1827891138431811584 |
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| author | Chang‐Mok Oh Sujung Park Jihoon Lee Sung Heum Park Shinuk Cho In‐Wook Hwang |
| author_facet | Chang‐Mok Oh Sujung Park Jihoon Lee Sung Heum Park Shinuk Cho In‐Wook Hwang |
| author_sort | Chang‐Mok Oh |
| collection | DOAJ |
| description | Abstract Bulk heterojunction (BHJ) composites show improved power conversion efficiencies when optimized in terms of morphology using various film processing methods. A reduced carrier recombination loss in an optimized BHJ was characterized previously. However, the driving force that leads to this reduction was not clearly understood. In this study, we focus on the decreased carrier recombination loss and its driving force in optimized nonfullerene acceptor‐based PTB7‐Th:IEICO‐4F BHJ composites. We demonstrate that the optimized BHJ shows deactivation in the sub‐nanosecond nongeminate carrier recombination process. The driving force for this deactivation was determined to be the improved interchain hole delocalization between the polymers. An enhanced interchain hole delocalization was observed using steady‐state photoinduced absorption (PIA) spectroscopy. In particular, increased splitting between the polaron PIA bands was noted. Moreover, improved interchain hole delocalization was observed for other state‐of‐the‐art BHJ materials, including D18:Y6 with optimized morphologies. |
| first_indexed | 2024-03-12T21:21:29Z |
| format | Article |
| id | doaj.art-29737c246a73446289a0469c4514fb16 |
| institution | Directory Open Access Journal |
| issn | 2637-9368 |
| language | English |
| last_indexed | 2024-03-12T21:21:29Z |
| publishDate | 2023-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Carbon Energy |
| spelling | doaj.art-29737c246a73446289a0469c4514fb162023-07-28T15:56:59ZengWileyCarbon Energy2637-93682023-07-0157n/an/a10.1002/cey2.302Enhanced charge separation by interchain hole delocalization in nonfullerene acceptor‐based bulk heterojunction materialsChang‐Mok Oh0Sujung Park1Jihoon Lee2Sung Heum Park3Shinuk Cho4In‐Wook Hwang5Advanced Photonics Research Institute Gwangju Institute of Science and Technology Gwangju Republic of KoreaDepartment of Physics and Energy Harvest Storage Research Center University of Ulsan Ulsan Republic of KoreaDepartment of Physics Pukyong National University Busan Republic of KoreaDepartment of Physics Pukyong National University Busan Republic of KoreaDepartment of Physics and Energy Harvest Storage Research Center University of Ulsan Ulsan Republic of KoreaAdvanced Photonics Research Institute Gwangju Institute of Science and Technology Gwangju Republic of KoreaAbstract Bulk heterojunction (BHJ) composites show improved power conversion efficiencies when optimized in terms of morphology using various film processing methods. A reduced carrier recombination loss in an optimized BHJ was characterized previously. However, the driving force that leads to this reduction was not clearly understood. In this study, we focus on the decreased carrier recombination loss and its driving force in optimized nonfullerene acceptor‐based PTB7‐Th:IEICO‐4F BHJ composites. We demonstrate that the optimized BHJ shows deactivation in the sub‐nanosecond nongeminate carrier recombination process. The driving force for this deactivation was determined to be the improved interchain hole delocalization between the polymers. An enhanced interchain hole delocalization was observed using steady‐state photoinduced absorption (PIA) spectroscopy. In particular, increased splitting between the polaron PIA bands was noted. Moreover, improved interchain hole delocalization was observed for other state‐of‐the‐art BHJ materials, including D18:Y6 with optimized morphologies.https://doi.org/10.1002/cey2.302bulk heterojunctioninterchain hole delocalizationnonfullerene acceptorphotoinduced absorption spectroscopysolar cell |
| spellingShingle | Chang‐Mok Oh Sujung Park Jihoon Lee Sung Heum Park Shinuk Cho In‐Wook Hwang Enhanced charge separation by interchain hole delocalization in nonfullerene acceptor‐based bulk heterojunction materials Carbon Energy bulk heterojunction interchain hole delocalization nonfullerene acceptor photoinduced absorption spectroscopy solar cell |
| title | Enhanced charge separation by interchain hole delocalization in nonfullerene acceptor‐based bulk heterojunction materials |
| title_full | Enhanced charge separation by interchain hole delocalization in nonfullerene acceptor‐based bulk heterojunction materials |
| title_fullStr | Enhanced charge separation by interchain hole delocalization in nonfullerene acceptor‐based bulk heterojunction materials |
| title_full_unstemmed | Enhanced charge separation by interchain hole delocalization in nonfullerene acceptor‐based bulk heterojunction materials |
| title_short | Enhanced charge separation by interchain hole delocalization in nonfullerene acceptor‐based bulk heterojunction materials |
| title_sort | enhanced charge separation by interchain hole delocalization in nonfullerene acceptor based bulk heterojunction materials |
| topic | bulk heterojunction interchain hole delocalization nonfullerene acceptor photoinduced absorption spectroscopy solar cell |
| url | https://doi.org/10.1002/cey2.302 |
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