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A Nitroxide Radical Conjugated Polymer as an Additive to Reduce Nonradiative Energy Loss in Organic Solar Cells
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Chunfeng Zhang,
Young‐Wan Kwon,
Han Young Woo,
Hongbin Wu,
Jianhui Hou,
Dongge Ma,
Ardalan Armin ,
Yuguang Ma,
Yangjun Xia
Advanced Materials, Volume: 35, Issue: 23
Swansea University Author:
Ardalan Armin
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DOI (Published version): 10.1002/adma.202212084
Abstract
Nonfullerene-acceptor-based organic solar cells (NFA-OSCs) are now set off to the 20% power conversion efficiency milestone. To achieve this, minimizing all loss channels, including nonradiative photovoltage losses, seems a necessity. Nonradiative recombination, to a great extent, is known to be an...
| Published in: | Advanced Materials |
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| ISSN: | 0935-9648 1521-4095 |
| Published: |
Wiley
2023
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa63936 |
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| Abstract: |
Nonfullerene-acceptor-based organic solar cells (NFA-OSCs) are now set off to the 20% power conversion efficiency milestone. To achieve this, minimizing all loss channels, including nonradiative photovoltage losses, seems a necessity. Nonradiative recombination, to a great extent, is known to be an inherent material property due to vibrationally induced decay of charge-transfer (CT) states or their back electron transfer to the triplet excitons. Herein, it is shown that the use of a new conjugated nitroxide radical polymer with 2,2,6,6-tetramethyl piperidine-1-oxyl side groups (GDTA) as an additive results in an improvement of the photovoltaic performance of NFA-OSCs based on different active layer materials. Upon the addition of GDTA, the open-circuit voltage (VOC), fill factor (FF), and short-circuit current density (JSC) improve simultaneously. This approach is applied to several material systems including state-of-the-art donor/acceptor pairs showing improvement from 15.8% to 17.6% (in the case of PM6:Y6) and from 17.5% to 18.3% (for PM6:BTP-eC9). Then, the possible reasons behind the observed improvements are discussed. The results point toward the suppression of the CT state to triplet excitons loss channel. This work presents a facile, promising, and generic approach to further improve the performance of NFA-OSCs. |
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| Keywords: |
Low-lying triplets, nitroxide radical conjugated polymers, nonradiative energy loss, organic solar cells, solid additives |
| College: |
Faculty of Science and Engineering |
| Funders: |
Industrial Guidance Project for Colleges and Universities of Gansu Province. Grant Number: 2020C-07
National Nature Science Foundation of China. Grant Numbers: 62164007, 51903112
National Research Foundation of Korea. Grant Numbers: 2019R1A2C2085290, 2019R1A6A1A11044070
K&A Wallenberg Foundation. Grant Numbers: 2017.0186, 2016.0059
the Swedish Energy Agency. Grant Number: P2021-90067
the Swedish Research Council. Grant Numbers: 2016-06146, 2019-04683
Open Project Program of Wuhan National Laboratory for Optoelectronics. Grant Number: 2019WNLOKF016
Sêr Cymru II Rising Star Fellow and acknowledges EPSRC Program Grant. Grant Number: EP/T028511/1 |
| Issue: |
23 |