Journal
NANO ENERGY
Volume 69, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.104447
Keywords
Ternary organic photovoltaics; Morphology regulate; Phase separation; Molecular arrangement
Categories
Funding
- National Natural Science Foundation of China [61564003, 61774050]
- Guangxi Natural Science Foundation Program [2015GXNSFGA139002]
- Innovation Project of GUET Graduate Education [2019YCXS110]
- GUET Excellent Graduate Thesis Program [17YJPYSS31]
- Bagui Scholars Program of Guangxi
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Ternary organic photovoltaics (OPVs) combining two polymer donors (PM6, J71) and one non-fullerene acceptor Y6 were prepared in conventional configuration. The complementary absorption spectra of PM6 and J71 can maximize photon harvesting in ternary films that is beneficial to the enhancement of short circuit current density (J(SC)). The open circuit voltage (V-OC) of ternary OPVs show a monotonously increased trend along with the increase of J71 content, which is attributed to reduced energy loss considering the similar HOMO energy levels of two donors. Furthermore, the optimized molecular arrangement and phase separation in ternary films result a high fill factor (FF) of 76.0%. As a result, by incorporating 10 wt% J71 in ternary films, the power conversion efficiency of ternary OPVs achieves 16.5% that is the highest values for ternary OPVs with two donors. The results indicate that ternary OPVs with two donors could achieve high performance by well-optimized photon harvesting and phase separation.
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