High‐Efficiency and Stable Perovskite Solar Cells Enabled by Halogen‐Free Cosolvent‐Processed Pyrazine‐Based Dopant‐Free Hole Transport Material
ABSTRACT The complex molecular structures of electron donor (D)–acceptor (A) polymers provide a wealth of useful hints for producing high power conversion efficiency (PCE) as hole transport materials (HTMs) in perovskite solar cells (PVSCs). Given the recent improvements in PCE, various features are...
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Wiley
2025-01-01
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| Series: | EcoMat |
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| Online Access: | https://doi.org/10.1002/eom2.12507 |
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| author | Chetan Lakshman Hyerin Kim Bo Hyeon Cho Donghyun Song Jeonghyeon Park Young Yong Kim Jinhwan Yoon Sung‐Ho Jin |
| author_facet | Chetan Lakshman Hyerin Kim Bo Hyeon Cho Donghyun Song Jeonghyeon Park Young Yong Kim Jinhwan Yoon Sung‐Ho Jin |
| author_sort | Chetan Lakshman |
| collection | DOAJ |
| description | ABSTRACT The complex molecular structures of electron donor (D)–acceptor (A) polymers provide a wealth of useful hints for producing high power conversion efficiency (PCE) as hole transport materials (HTMs) in perovskite solar cells (PVSCs). Given the recent improvements in PCE, various features are focused on altering the functionalities of HTMs. In this study, a pyrazine‐based acceptor is fused with two known donors benzodithiophene (BDT) and dithienobenzodithiophene (DTBDT) to synthesize two new D–A type polymers (NBD‐Pyz and NDT‐Pyz) to employ them as dopant‐free HTM in PVSCs. The insertion of pyrazine moiety downshifted the energy levels and enhanced coplanarity for both the HTMs. NBD‐Pyz can significantly lower the trap density and passivate the perovskite layer. More interestingly, the NBD‐Pyz HTM performs better than NDT‐Pyz, exhibiting higher hole mobility and better solubility in 2‐methyl anisole (2MA) and o‐xylene. Moreover, a 2MA/o‐xylene cosolvent‐processed dopant‐free polymeric NBD‐Pyz HTM‐based device achieved a champion PCE of 22.9%. Unlike NDT‐Pyz and Spiro‐OMeTAD‐based PVSCs, the unencapsulated NBD‐Pyz devices were more stable, retaining almost 90% of their initial efficiency after 1000 h. In addition, excellent thermal stability was demonstrated by the resulting PVSCs without encapsulation. |
| format | Article |
| id | doaj-art-17b7a08a462c42139a42c04112b8350b |
| institution | Kabale University |
| issn | 2567-3173 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | EcoMat |
| spelling | doaj-art-17b7a08a462c42139a42c04112b8350b2025-01-16T00:02:33ZengWileyEcoMat2567-31732025-01-0171n/an/a10.1002/eom2.12507High‐Efficiency and Stable Perovskite Solar Cells Enabled by Halogen‐Free Cosolvent‐Processed Pyrazine‐Based Dopant‐Free Hole Transport MaterialChetan Lakshman0Hyerin Kim1Bo Hyeon Cho2Donghyun Song3Jeonghyeon Park4Young Yong Kim5Jinhwan Yoon6Sung‐Ho Jin7Department of Chemistry Education, Graduate Department of Chemical Materials, Institute for Plastic Information and Energy Materials, Sustainable Utilization of Photovoltaic Energy Research Center (ERC) Pusan National University Busan Republic of KoreaDepartment of Chemistry Education, Graduate Department of Chemical Materials, Institute for Plastic Information and Energy Materials, Sustainable Utilization of Photovoltaic Energy Research Center (ERC) Pusan National University Busan Republic of KoreaDepartment of Chemistry Education, Graduate Department of Chemical Materials, Institute for Plastic Information and Energy Materials, Sustainable Utilization of Photovoltaic Energy Research Center (ERC) Pusan National University Busan Republic of KoreaDepartment of Chemistry Education, Graduate Department of Chemical Materials, Institute for Plastic Information and Energy Materials, Sustainable Utilization of Photovoltaic Energy Research Center (ERC) Pusan National University Busan Republic of KoreaDepartment of Chemistry Education, Graduate Department of Chemical Materials, Institute for Plastic Information and Energy Materials, Sustainable Utilization of Photovoltaic Energy Research Center (ERC) Pusan National University Busan Republic of KoreaBeamline Division, Pohang Accelerator Laboratory Pohang University of Science and Technology Pohang Republic of KoreaDepartment of Chemistry Education, Graduate Department of Chemical Materials, Institute for Plastic Information and Energy Materials, Sustainable Utilization of Photovoltaic Energy Research Center (ERC) Pusan National University Busan Republic of KoreaDepartment of Chemistry Education, Graduate Department of Chemical Materials, Institute for Plastic Information and Energy Materials, Sustainable Utilization of Photovoltaic Energy Research Center (ERC) Pusan National University Busan Republic of KoreaABSTRACT The complex molecular structures of electron donor (D)–acceptor (A) polymers provide a wealth of useful hints for producing high power conversion efficiency (PCE) as hole transport materials (HTMs) in perovskite solar cells (PVSCs). Given the recent improvements in PCE, various features are focused on altering the functionalities of HTMs. In this study, a pyrazine‐based acceptor is fused with two known donors benzodithiophene (BDT) and dithienobenzodithiophene (DTBDT) to synthesize two new D–A type polymers (NBD‐Pyz and NDT‐Pyz) to employ them as dopant‐free HTM in PVSCs. The insertion of pyrazine moiety downshifted the energy levels and enhanced coplanarity for both the HTMs. NBD‐Pyz can significantly lower the trap density and passivate the perovskite layer. More interestingly, the NBD‐Pyz HTM performs better than NDT‐Pyz, exhibiting higher hole mobility and better solubility in 2‐methyl anisole (2MA) and o‐xylene. Moreover, a 2MA/o‐xylene cosolvent‐processed dopant‐free polymeric NBD‐Pyz HTM‐based device achieved a champion PCE of 22.9%. Unlike NDT‐Pyz and Spiro‐OMeTAD‐based PVSCs, the unencapsulated NBD‐Pyz devices were more stable, retaining almost 90% of their initial efficiency after 1000 h. In addition, excellent thermal stability was demonstrated by the resulting PVSCs without encapsulation.https://doi.org/10.1002/eom2.12507cosolventdopant‐free HTMshigh PCEperovskite solar cellspyrazine |
| spellingShingle | Chetan Lakshman Hyerin Kim Bo Hyeon Cho Donghyun Song Jeonghyeon Park Young Yong Kim Jinhwan Yoon Sung‐Ho Jin High‐Efficiency and Stable Perovskite Solar Cells Enabled by Halogen‐Free Cosolvent‐Processed Pyrazine‐Based Dopant‐Free Hole Transport Material EcoMat cosolvent dopant‐free HTMs high PCE perovskite solar cells pyrazine |
| title | High‐Efficiency and Stable Perovskite Solar Cells Enabled by Halogen‐Free Cosolvent‐Processed Pyrazine‐Based Dopant‐Free Hole Transport Material |
| title_full | High‐Efficiency and Stable Perovskite Solar Cells Enabled by Halogen‐Free Cosolvent‐Processed Pyrazine‐Based Dopant‐Free Hole Transport Material |
| title_fullStr | High‐Efficiency and Stable Perovskite Solar Cells Enabled by Halogen‐Free Cosolvent‐Processed Pyrazine‐Based Dopant‐Free Hole Transport Material |
| title_full_unstemmed | High‐Efficiency and Stable Perovskite Solar Cells Enabled by Halogen‐Free Cosolvent‐Processed Pyrazine‐Based Dopant‐Free Hole Transport Material |
| title_short | High‐Efficiency and Stable Perovskite Solar Cells Enabled by Halogen‐Free Cosolvent‐Processed Pyrazine‐Based Dopant‐Free Hole Transport Material |
| title_sort | high efficiency and stable perovskite solar cells enabled by halogen free cosolvent processed pyrazine based dopant free hole transport material |
| topic | cosolvent dopant‐free HTMs high PCE perovskite solar cells pyrazine |
| url | https://doi.org/10.1002/eom2.12507 |
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