Deciphering the Role of Hole Transport Layer HOMO Level on the Open Circuit Voltage of Perovskite Solar Cells
Abstract With the rapid development of perovskite solar cells, reducing losses in open‐circuit voltage (Voc) is a key issue in efforts to further improve device performance. Here it is focused on investigating the correlation between the highest occupied molecular orbital (HOMO) of device hole trans...
| Principais autores: | , , , , , , , , , , , |
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| Formato: | Artigo |
| Idioma: | English |
| Publicado em: |
Wiley-VCH
2023-07-01
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| coleção: | Advanced Materials Interfaces |
| Assuntos: | |
| Acesso em linha: | https://doi.org/10.1002/admi.202201737 |
| _version_ | 1827893452817301504 |
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| author | Zhongyao Jiang Tian Du Chieh‐Ting Lin Thomas J. Macdonald Jiongye Chen Yi‐Chun Chin Weidong Xu Bowen Ding Ji‐Seon Kim James R. Durrant Martin Heeney Martyn A. McLachlan |
| author_facet | Zhongyao Jiang Tian Du Chieh‐Ting Lin Thomas J. Macdonald Jiongye Chen Yi‐Chun Chin Weidong Xu Bowen Ding Ji‐Seon Kim James R. Durrant Martin Heeney Martyn A. McLachlan |
| author_sort | Zhongyao Jiang |
| collection | DOAJ |
| description | Abstract With the rapid development of perovskite solar cells, reducing losses in open‐circuit voltage (Voc) is a key issue in efforts to further improve device performance. Here it is focused on investigating the correlation between the highest occupied molecular orbital (HOMO) of device hole transport layers (HTLs) and device Voc. To achieve this, structurally similar HTL materials with comparable optical band gaps and doping levels, but distinctly different HOMO levels are employed. Using light‐intensity dependent Voc and photoluminescence measurements significant differences in the behavior of devices employing the two HTLs are highlighted. Light‐induced increase of quasi‐Fermi level splitting (ΔEF) in the perovskite layer results in interfacial quasi‐Fermi level bending required to align with the HOMO level of the HTL, resulting in the Voc measured at the contacts being smaller than the ΔEF in the perovskite. It is concluded that minimizing the energetic offset between HTLs and the perovskite active layer is of great importance to reduce non‐radiative recombination losses in perovskite solar cells with high Voc values that approach the radiative limit. |
| first_indexed | 2024-03-12T21:53:12Z |
| format | Article |
| id | doaj.art-735a5b516ebd4dbc964497ef6bf30141 |
| institution | Directory Open Access Journal |
| issn | 2196-7350 |
| language | English |
| last_indexed | 2024-03-12T21:53:12Z |
| publishDate | 2023-07-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | Advanced Materials Interfaces |
| spelling | doaj.art-735a5b516ebd4dbc964497ef6bf301412023-07-26T01:35:17ZengWiley-VCHAdvanced Materials Interfaces2196-73502023-07-011019n/an/a10.1002/admi.202201737Deciphering the Role of Hole Transport Layer HOMO Level on the Open Circuit Voltage of Perovskite Solar CellsZhongyao Jiang0Tian Du1Chieh‐Ting Lin2Thomas J. Macdonald3Jiongye Chen4Yi‐Chun Chin5Weidong Xu6Bowen Ding7Ji‐Seon Kim8James R. Durrant9Martin Heeney10Martyn A. McLachlan11Department of Materials and Centre for Processable Electronics Molecular Science Research Hub Imperial College London W12 0BZ UKDepartment of Materials and Centre for Processable Electronics Molecular Science Research Hub Imperial College London W12 0BZ UKDepartment of Materials and Centre for Processable Electronics Molecular Science Research Hub Imperial College London W12 0BZ UKDepartment of Chemistry and Centre for Processable Electronics Molecular Science Research Hub Imperial College London W12 0BZ UKDepartment of Physics and Centre for Processable Electronics Imperial College London London SW7 2AZ UKDepartment of Physics and Centre for Processable Electronics Imperial College London London SW7 2AZ UKDepartment of Chemistry and Centre for Processable Electronics Molecular Science Research Hub Imperial College London W12 0BZ UKDepartment of Chemistry and Centre for Processable Electronics Molecular Science Research Hub Imperial College London W12 0BZ UKDepartment of Physics and Centre for Processable Electronics Imperial College London London SW7 2AZ UKDepartment of Chemistry and Centre for Processable Electronics Molecular Science Research Hub Imperial College London W12 0BZ UKDepartment of Chemistry and Centre for Processable Electronics Molecular Science Research Hub Imperial College London W12 0BZ UKDepartment of Materials and Centre for Processable Electronics Molecular Science Research Hub Imperial College London W12 0BZ UKAbstract With the rapid development of perovskite solar cells, reducing losses in open‐circuit voltage (Voc) is a key issue in efforts to further improve device performance. Here it is focused on investigating the correlation between the highest occupied molecular orbital (HOMO) of device hole transport layers (HTLs) and device Voc. To achieve this, structurally similar HTL materials with comparable optical band gaps and doping levels, but distinctly different HOMO levels are employed. Using light‐intensity dependent Voc and photoluminescence measurements significant differences in the behavior of devices employing the two HTLs are highlighted. Light‐induced increase of quasi‐Fermi level splitting (ΔEF) in the perovskite layer results in interfacial quasi‐Fermi level bending required to align with the HOMO level of the HTL, resulting in the Voc measured at the contacts being smaller than the ΔEF in the perovskite. It is concluded that minimizing the energetic offset between HTLs and the perovskite active layer is of great importance to reduce non‐radiative recombination losses in perovskite solar cells with high Voc values that approach the radiative limit.https://doi.org/10.1002/admi.202201737interlayersopen‐circuit voltageperovskitephotovoltaicphotoluminescence |
| spellingShingle | Zhongyao Jiang Tian Du Chieh‐Ting Lin Thomas J. Macdonald Jiongye Chen Yi‐Chun Chin Weidong Xu Bowen Ding Ji‐Seon Kim James R. Durrant Martin Heeney Martyn A. McLachlan Deciphering the Role of Hole Transport Layer HOMO Level on the Open Circuit Voltage of Perovskite Solar Cells Advanced Materials Interfaces interlayers open‐circuit voltage perovskite photovoltaic photoluminescence |
| title | Deciphering the Role of Hole Transport Layer HOMO Level on the Open Circuit Voltage of Perovskite Solar Cells |
| title_full | Deciphering the Role of Hole Transport Layer HOMO Level on the Open Circuit Voltage of Perovskite Solar Cells |
| title_fullStr | Deciphering the Role of Hole Transport Layer HOMO Level on the Open Circuit Voltage of Perovskite Solar Cells |
| title_full_unstemmed | Deciphering the Role of Hole Transport Layer HOMO Level on the Open Circuit Voltage of Perovskite Solar Cells |
| title_short | Deciphering the Role of Hole Transport Layer HOMO Level on the Open Circuit Voltage of Perovskite Solar Cells |
| title_sort | deciphering the role of hole transport layer homo level on the open circuit voltage of perovskite solar cells |
| topic | interlayers open‐circuit voltage perovskite photovoltaic photoluminescence |
| url | https://doi.org/10.1002/admi.202201737 |
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