Charge transfer and charge separation dynamics in efficient non-fullerene solar cells
Recently, Non-fullerene organic solar cells (OSCs) has been making rapid progress and reaching record breaking efficiency [1]. In the conventional idea for the fullerene based OSCs, one need a large donor-acceptor (D/A) offsets to cause rapid (i.e., <1ps) and effective charge separation from exci...
| Main Authors: | , , , , |
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| Format: | Conference Paper |
| Language: | English |
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2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/144220 |
| _version_ | 1811677381450006528 |
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| author | Ma, Chao Chan, Christopher C. S. Chow, Philip C. Y. Yan, He Wong, Kam Sing |
| author2 | Asian Spectroscopy Conference 2020 |
| author_facet | Asian Spectroscopy Conference 2020 Ma, Chao Chan, Christopher C. S. Chow, Philip C. Y. Yan, He Wong, Kam Sing |
| author_sort | Ma, Chao |
| collection | NTU |
| description | Recently, Non-fullerene organic solar cells (OSCs) has been making rapid progress and reaching record breaking efficiency [1]. In the conventional idea for the fullerene based OSCs, one need a large donor-acceptor (D/A) offsets to cause rapid (i.e., <1ps) and effective charge separation from exciton at the D/A heterojunction [2]. However, recent work showed that non-fullerene OSC with small D/A offset can also achieved very high power conversion efficiency (PCE) [1,3-4]. The explanation for this is that charge separation occurs over hundreds of ps from thermalized charge transfer exciton (CTEs) at the D/A heterojunction for the non-fullerene system [5], thus charge separation in efficient non-fullerene OSC with small D/A offset is an endothermic process. Here we will present our recent transient absorption (TA) spectroscopy studies to further elucidate the temperature dependence of charge transfer and charge separation dynamics in a number of non-fullerene OSC model systems with negligible D/A LUMO offset but variable HOMO offsets. |
| first_indexed | 2024-10-01T02:36:28Z |
| format | Conference Paper |
| id | ntu-10356/144220 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:36:28Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1442202020-10-22T20:10:28Z Charge transfer and charge separation dynamics in efficient non-fullerene solar cells Ma, Chao Chan, Christopher C. S. Chow, Philip C. Y. Yan, He Wong, Kam Sing Asian Spectroscopy Conference 2020 Institute of Advanced Studies Science::Chemistry Ultrafast Spectroscopy Organic Solar Cells Recently, Non-fullerene organic solar cells (OSCs) has been making rapid progress and reaching record breaking efficiency [1]. In the conventional idea for the fullerene based OSCs, one need a large donor-acceptor (D/A) offsets to cause rapid (i.e., <1ps) and effective charge separation from exciton at the D/A heterojunction [2]. However, recent work showed that non-fullerene OSC with small D/A offset can also achieved very high power conversion efficiency (PCE) [1,3-4]. The explanation for this is that charge separation occurs over hundreds of ps from thermalized charge transfer exciton (CTEs) at the D/A heterojunction for the non-fullerene system [5], thus charge separation in efficient non-fullerene OSC with small D/A offset is an endothermic process. Here we will present our recent transient absorption (TA) spectroscopy studies to further elucidate the temperature dependence of charge transfer and charge separation dynamics in a number of non-fullerene OSC model systems with negligible D/A LUMO offset but variable HOMO offsets. Published version 2020-10-21T05:58:43Z 2020-10-21T05:58:43Z 2020 Conference Paper Ma, C., Chan, C. C. S., Chow, P. C. Y., Yan, H., & Wong, K. S. (2020). Charge transfer and charge separation dynamics in efficient non-fullerene solar cells. Proc. Of the 7th Asian Spectroscopy Conference (ASC 2020). doi:10.32655/ASC_8-10_Dec2020.15 https://hdl.handle.net/10356/144220 10.32655/ASC_8-10_Dec2020.15 en © 2020 Nanyang Technological University. application/pdf |
| spellingShingle | Science::Chemistry Ultrafast Spectroscopy Organic Solar Cells Ma, Chao Chan, Christopher C. S. Chow, Philip C. Y. Yan, He Wong, Kam Sing Charge transfer and charge separation dynamics in efficient non-fullerene solar cells |
| title | Charge transfer and charge separation dynamics in efficient non-fullerene solar cells |
| title_full | Charge transfer and charge separation dynamics in efficient non-fullerene solar cells |
| title_fullStr | Charge transfer and charge separation dynamics in efficient non-fullerene solar cells |
| title_full_unstemmed | Charge transfer and charge separation dynamics in efficient non-fullerene solar cells |
| title_short | Charge transfer and charge separation dynamics in efficient non-fullerene solar cells |
| title_sort | charge transfer and charge separation dynamics in efficient non fullerene solar cells |
| topic | Science::Chemistry Ultrafast Spectroscopy Organic Solar Cells |
| url | https://hdl.handle.net/10356/144220 |
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