1. Ternary polymer solar cells by employing two well-compatible donors with cascade energy levels.
- Author
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Liu, Zhiyong and Wang, Hongen
- Subjects
- *
SILICON solar cells , *SOLAR cells , *FRONTIER orbitals , *PHOTOVOLTAIC cells , *SHORT-circuit currents - Abstract
In this study, a ternary polymer solar cell (PSCs) are fabricated by using two well-compatible donors as a blend donor (D18 as the host donor and PBDB-TF as the guest donor) and Y6 as an acceptor. The D18:Y6 and PBDB-TF:Y6 binary PSCs exhibit 13.96% and 13.42% power conversion efficiencies (PCEs), respectively. D18 and PBDB-TF have similar highest occupied molecular orbital (HOMO) energy levels, which prevents the formation of charge recombination centers within photoactive layer. The increased short-circuit current density (J SC) is mainly attributed to the complementary absorption spectra of PBDB-TF to that of D18 and Y6. In addition, the cascade lowest unoccupied molecular orbital (LUMO) energy levels of D18 and PBDB-TF lead to improved exciton dissociation and charge transport at the D18/PBDB-TF interface. The optimized ternary PSCs show highest PCE of 14.85%. Such ternary strategy with two well-compatible donors with similar HOMO energy levels and cascade LUMO energy levels is an efficient method to realize performance improvement of PSCs. [Display omitted] • Ternary PSCs were fabricated with PBDB-TF as third component materials. • The improvement of charge dynamics process by ternary strategy. • The improved exciton-dissociation at the donor–blend acceptor interface. • The ternary PSCs with blend donor achieved a PCE of 14.85%. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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