Study of Thermalization Mechanisms of Hot Carriers in BABr-Added MAPbBr<sub>3</sub> for the Top Layer of Four-Junction Solar Cells
The hot carrier multi-junction solar cell (HCMJC) is an advanced-concept solar cell with a theoretical efficiency greater than 65%. It combines the advantages of hot carrier solar cells and multi-junction solar cells with higher power conversion efficiency (PCE). The thermalization coefficient (<...
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2024-12-01
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| author | Yi Zhang Huilong Chen Junfeng Qu Jiayu Zhang Gavin Conibeer |
| author_facet | Yi Zhang Huilong Chen Junfeng Qu Jiayu Zhang Gavin Conibeer |
| author_sort | Yi Zhang |
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| description | The hot carrier multi-junction solar cell (HCMJC) is an advanced-concept solar cell with a theoretical efficiency greater than 65%. It combines the advantages of hot carrier solar cells and multi-junction solar cells with higher power conversion efficiency (PCE). The thermalization coefficient (<i>Q<sub>th</sub></i>) has been shown to slow down by an order of magnitude in low-dimensional structures, which will significantly improve PCE. However, there have been no studies calculating the <i>Q<sub>th</sub></i> of MAPbBr<sub>3</sub> quantum dots so far. In this work, the <i>Q<sub>th</sub></i> values of MAPbBr<sub>3</sub> quantum dots and after BABr addition were calculated based on power-dependent steady-state photoluminescence (PD-SSPL). Their peak positions in PD-SSPL increased from 2.37 to 2.71 eV after adding BABr. The fitting shows that, after adding BABr, the <i>Q<sub>th</sub></i> decreased from 2.64 ± 0.29 mW·K<sup>−1</sup>·cm<sup>−2</sup> to 2.36 ± 0.25 mW·K<sup>−1</sup>·cm<sup>−2</sup>, indicating a lower relaxation rate. This is because BABr passivates surface defects, slowing down the carrier thermalization process. This work lays the foundation for the theoretical framework combining perovskite materials, which suggests that the appropriate passivation of BABr has the potential to further reduce <i>Q<sub>th</sub></i> and make MAPbBr<sub>3</sub> QDs with BABr modified more suitable as the top absorption layer of HCMJCs. |
| format | Article |
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| publishDate | 2024-12-01 |
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| series | Nanomaterials |
| spelling | doaj-art-adb544c921944a89911dee0001c4965b2025-08-20T02:01:11ZengMDPI AGNanomaterials2079-49912024-12-011424204110.3390/nano14242041Study of Thermalization Mechanisms of Hot Carriers in BABr-Added MAPbBr<sub>3</sub> for the Top Layer of Four-Junction Solar CellsYi Zhang0Huilong Chen1Junfeng Qu2Jiayu Zhang3Gavin Conibeer4College of Renewable Energy, Hohai University, Changzhou 213200, ChinaCollege of Renewable Energy, Hohai University, Changzhou 213200, ChinaCollege of Renewable Energy, Hohai University, Changzhou 213200, ChinaAdvanced Photonics Center, Southeast University, Nanjing 210096, ChinaSchool of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Kensington, NSW 2052, AustraliaThe hot carrier multi-junction solar cell (HCMJC) is an advanced-concept solar cell with a theoretical efficiency greater than 65%. It combines the advantages of hot carrier solar cells and multi-junction solar cells with higher power conversion efficiency (PCE). The thermalization coefficient (<i>Q<sub>th</sub></i>) has been shown to slow down by an order of magnitude in low-dimensional structures, which will significantly improve PCE. However, there have been no studies calculating the <i>Q<sub>th</sub></i> of MAPbBr<sub>3</sub> quantum dots so far. In this work, the <i>Q<sub>th</sub></i> values of MAPbBr<sub>3</sub> quantum dots and after BABr addition were calculated based on power-dependent steady-state photoluminescence (PD-SSPL). Their peak positions in PD-SSPL increased from 2.37 to 2.71 eV after adding BABr. The fitting shows that, after adding BABr, the <i>Q<sub>th</sub></i> decreased from 2.64 ± 0.29 mW·K<sup>−1</sup>·cm<sup>−2</sup> to 2.36 ± 0.25 mW·K<sup>−1</sup>·cm<sup>−2</sup>, indicating a lower relaxation rate. This is because BABr passivates surface defects, slowing down the carrier thermalization process. This work lays the foundation for the theoretical framework combining perovskite materials, which suggests that the appropriate passivation of BABr has the potential to further reduce <i>Q<sub>th</sub></i> and make MAPbBr<sub>3</sub> QDs with BABr modified more suitable as the top absorption layer of HCMJCs.https://www.mdpi.com/2079-4991/14/24/2041hot carrier solar cellsthermalization coefficientperovskite |
| spellingShingle | Yi Zhang Huilong Chen Junfeng Qu Jiayu Zhang Gavin Conibeer Study of Thermalization Mechanisms of Hot Carriers in BABr-Added MAPbBr<sub>3</sub> for the Top Layer of Four-Junction Solar Cells Nanomaterials hot carrier solar cells thermalization coefficient perovskite |
| title | Study of Thermalization Mechanisms of Hot Carriers in BABr-Added MAPbBr<sub>3</sub> for the Top Layer of Four-Junction Solar Cells |
| title_full | Study of Thermalization Mechanisms of Hot Carriers in BABr-Added MAPbBr<sub>3</sub> for the Top Layer of Four-Junction Solar Cells |
| title_fullStr | Study of Thermalization Mechanisms of Hot Carriers in BABr-Added MAPbBr<sub>3</sub> for the Top Layer of Four-Junction Solar Cells |
| title_full_unstemmed | Study of Thermalization Mechanisms of Hot Carriers in BABr-Added MAPbBr<sub>3</sub> for the Top Layer of Four-Junction Solar Cells |
| title_short | Study of Thermalization Mechanisms of Hot Carriers in BABr-Added MAPbBr<sub>3</sub> for the Top Layer of Four-Junction Solar Cells |
| title_sort | study of thermalization mechanisms of hot carriers in babr added mapbbr sub 3 sub for the top layer of four junction solar cells |
| topic | hot carrier solar cells thermalization coefficient perovskite |
| url | https://www.mdpi.com/2079-4991/14/24/2041 |
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