Iridium-based polymer PM6Ir1 as an electron donor and two nonfullerene materials N3and ITIC-Th as electron acceptors were selected to prepare efficient polymer solar cells (PSCs). ITIC-Th was used as the third component to enhance photon harvesting and as a morphology regulator to optimize molecular arrangement and phase separation in the ternary active layer. Improvements in open circuit voltage (0.86 Vvs.0.84 V), short circuit current density (26.53 mA cm−2vs.26.13 mA cm−2) and fill factor (75.47%vs.74.11%) are simultaneously obtained for the PSCs with 10 wt% ITIC-Th in the acceptor mixture, leading to a power conversion efficiency (PCE) enhancement from 16.27% to 17.22%. The charge mobility and charge transport balance in the ternary active layer can be enhanced by incorporating ITIC-Th, resulting from the optimized phase separation and molecular arrangement with ITIC-Th as a morphology regulator. The positive effect of ITIC-Th incorporation on PCE improvement can be demonstrated by the relatively high external quantum efficiency values of the optimal ternary PSCs in the spectral range from 300 to 820 nm.
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Energy Engineering and Power Technology