Journal article 637 views 229 downloads
Impact of Bimolecular Recombination on the Fill Factor of Fullerene and Nonfullerene-Based Solar Cells: A Comparative Study of Charge Generation and Extraction
Seyed Mehrdad Hosseini,
Steffen Roland,
Jona Kurpiers,
Zhiming Chen,
Kai Zhang,
Fei Huang,
Ardalan Armin 
,
Dieter Neher,
Safa Shoaee
,
Dieter Neher,
Safa Shoaee
The Journal of Physical Chemistry C, Volume: 123, Issue: 11, Pages: 6823 - 6830
Swansea University Author:
Ardalan Armin
-
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DOI (Published version): 10.1021/acs.jpcc.8b11669
Abstract
Power conversion efficiency of nonfullerene organic solar cells have now increased beyond the record of their fullerene-based counterparts. There remain many fundamental questions about their working principles such as charge generation and extraction and losses in these systems. Herein, we present...
| Published in: | The Journal of Physical Chemistry C |
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| ISSN: | 1932-7447 1932-7455 |
| Published: |
2019
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa49632 |
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| Abstract: |
Power conversion efficiency of nonfullerene organic solar cells have now increased beyond the record of their fullerene-based counterparts. There remain many fundamental questions about their working principles such as charge generation and extraction and losses in these systems. Herein, we present a comparative study of bulk heterojunction solar cells composed of a recently introduced nappthothiadiazole-based polymer (NT812) as the electron donor and two different acceptor molecules, namely PCBM[70] and ITIC. A comparison between photovoltaic performance of these two types of solar cells reveals that the open circuit voltage (Voc) of NT812:ITIC based solar cell is larger but the fill factor (FF) lower than that of NT812:PCBM[70] device. We find the key reason behind this reduced FF in the ITIC-based device to be faster non-geminate recombination relative to NT812:PCBM[70] system, which has previously been assigned to sub-optimum morphology. Nevertheless, NT812:ITIC system is more emissive than NT812:PCBM[70] resulting in smaller non-radiative Voc-loss. Suppression of bimolecular recombination together with reduced non-radiative Voc-loss can be considered as a key optimization route in the development of non-fullerene-based solar cells. |
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| College: |
Faculty of Science and Engineering |
| Issue: |
11 |
| Start Page: |
6823 |
| End Page: |
6830 |