Journal
ORGANIC ELECTRONICS
Volume 78, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2019.105587
Keywords
Ternary solar cells; Broaden absorption spectrum; Energy transfer; The power conversion efficiency; FRET
Funding
- Applied Basic Research Major Pro-gram of Hebei Province, China [18964303D]
- Scientific Research Project of Hebei Education Department [QN2018139]
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In recent years, ternary organic solar cells, which enable extended spectral response range compared to their binary counterpart, have been emerging as an attractive strategy for obtaining impressive photovoltaic properties. In this work, the third component of PBDB-T with a medium bandgap was introduced into PBT7-Th: PC71BM host system to fabricate high efficiency ternary solar cells. It was revealed that PBDB-T not only broadens the light absorption range, but also provides pathway for energy transfer via a Firster resonance energy transfer (FRET) regime. Finally, a champion PCE of 9.45% is achieved for the bulk heterojunction (BHJ) ternary solar cells with 15 wt% PBDB-T, which is 11% enhancement in PCE compared with the host binary OSCs. These results indicate that broadening absorption range is an effective strategy to improve OSCs performance.
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