Non-planar tetrathiafulvalene derivative modified hole transporting layer for efficient organic solar cells with improved fill factor
| Autor: | Chengjie Zhao, Le Liu, Min Zhao, Minjie Hu, Tonggang Jiu, Xunwen Xiao, Yuexing Li |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Organic solar cell Renewable Energy Sustainability and the Environment business.industry 020209 energy Energy conversion efficiency Photovoltaic system 02 engineering and technology 021001 nanoscience & nanotechnology Polymer solar cell Active layer Polystyrene sulfonate chemistry.chemical_compound chemistry PEDOT:PSS 0202 electrical engineering electronic engineering information engineering Optoelectronics General Materials Science 0210 nano-technology business Tetrathiafulvalene |
| Zdroj: | Solar Energy. 224:883-888 |
| ISSN: | 0038-092X |
| DOI: | 10.1016/j.solener.2021.06.057 |
| Popis: | Interface engineering has been widely proved to be an effective approach to improving the overall efficiency of organic solar cells (OSCs). Among the enhanced photovoltaic parameters, a high fill factor (FF) is more responsible for a stable and efficient device. Herein, a simple and effective strategy with a view to improving the FF is demonstrated by modification of hole transporting layers (HTLs). By using a non-planar conjugated tetrathiafulvalene derivative (named TTF-pm) and poly (3,4-ethylenedioxythiophene): polystyrene sulfonate (PEDOT:PSS) as double HTLs, the conventional device based on PTB7-Th:PC71BM bulk heterojunction delivers a boosted power conversion efficiency (PCE) of 9.80% and an impressive FF of 74.05%. The analyses presented indicate that the enhanced FF is mostly attributed to the optimized morphology of active layer, improved mobility and suppressed charge recombination via interfacial modification. Moreover, the device stability is also improved benefiting from the optimized film morphology. In addition, a PCE of 16.5% for non-fullerene organic solar cells based on PM6:Y6 blend film using the new HTLs is obtained, which is 7.8% higher than the control. This study highlights the potential of TTF derivatives as new HTLs for high and stable performance in the field of organic photovoltaics. |
| Databáze: | OpenAIRE |
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