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Probing Charge Generation Efficiency in Thin-Film Solar Cells by Integral-Mode Transient Charge Extraction
,
Jona Kurpiers,
Safa Shoaee ,
Paul Meredith ,
Ardalan Armin
ACS Photonics, Volume: 9, Issue: 4, Pages: 1188 - 1195
Swansea University Authors:
Stefan Zeiske, Oskar Sandberg , Paul Meredith , Ardalan Armin
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DOI (Published version): 10.1021/acsphotonics.1c01532
Abstract
The photogeneration of free charges in light-harvesting devices is a multistep process, which can be challenging to probe due to the complexity of contributing energetic states and the competitive character of different driving mechanisms. In this contribution, we advance a technique, integral-mode...
| Published in: | ACS Photonics |
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| ISSN: | 2330-4022 2330-4022 |
| Published: |
American Chemical Society (ACS)
2022
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa59906 |
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| Abstract: |
The photogeneration of free charges in light-harvesting devices is a multistep process, which can be challenging to probe due to the complexity of contributing energetic states and the competitive character of different driving mechanisms. In this contribution, we advance a technique, integral-mode transient charge extraction (ITCE), to probe these processes in thin-film solar cells. ITCE combines capacitance measurements with the integral-mode time-of-flight method in the low intensity regime of sandwich-type thin-film devices and allows for the sensitive determination of photogenerated charge-carrier densities. We verify the theoretical framework of our method by drift-diffusion simulations and demonstrate the applicability of ITCE to organic and perovskite semiconductor-based thin-film solar cells. Furthermore, we examine the field dependence of charge generation efficiency and find our ITCE results to be in excellent agreement with those obtained via time-delayed collection field measurements conducted on the same devices. |
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| Keywords: |
charge generation, thin-film solar cells, organic semiconductors, perovskite semiconductors, external generation efficiency |
| College: |
Faculty of Science and Engineering |
| Funders: |
Swansea University Alexander von Humboldt-Stiftung UK Research and Innovation - EP/T028511/1; Engineering Research Network Wales European Regional Development Fund |
| Issue: |
4 |
| Start Page: |
1188 |
| End Page: |
1195 |