期刊
SOLAR RRL
卷 5, 期 8, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202100365
关键词
organic photovoltaics; power conversion efficiencies; ternary strategies; thick films
资金
- National Natural Science Foundation of China [61975006, 62075155]
- Beijing Natural Science Foundation [4192049]
- Postdoctoral Innovative Talent Support Program [BX20200042]
- China Postdoctoral Science Foundation [2020M680327]
High-performance organic photovoltaics with varying active layer thicknesses were fabricated, showing that ternary OPVs exhibit relatively high power conversion efficiency and fill factor under 300 nm thick active layers.
High-performance organic photovoltaics (OPVs) with relatively thick active layers are essential for large-scale production. Herein, series of OPVs with different active layer thicknesses are fabricated using PM6 as the donor and BP4T-4F and BP3T-4F with symmetric and asymmetric structures as acceptors. With the active layer thickness increasing from 100 to 300 nm, the power conversion efficiency (PCE) of BP3T-4F-based binary OPVs is slightly decreased from 15.37% to 14.40%, while the PCEs of BP4T-4F-based binary OPVs are markedly decreased from 16.89% to 14.99%. The two kinds of binary OPVs exhibit distinct PCEs and thickness tolerance features, which may be recombined into ternary OPVs using compatible BP3T-4F and BP4T-4F as alloyed acceptors. The ternary OPVs exhibit a slightly decreased PCE from 16.91% to 16.03% along with active layer thickness from 100 to 300 nm, benefiting from the well-optimized phase separation in ternary active layers. It is worth highlighting that the fill factor (FF) of 71.47% is achieved in ternary thick-film OPVs. The PCE of 16.03% and FF of 71.47% should be among the highest values among OPVs with 300 nm thick active layers.
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