Figure 1: Chemical structures and optical and photovoltaic properties.
From: Aggregation and morphology control enables multiple cases of high-efficiency polymer solar cells
(a,b) Chemical structures of donor polymers and fullerenes; (c) J–V curve of a PffBT4T-2OD:PC71BM cell under AM1.5G illumination with an irradiation intensity of 100 mW cm−2 (one Sun). Inset: representative EQE spectra of PSCs with a thick (300 nm) and thin (150 nm) active layer. The arrow indicates the shift of the ‘low energy edge’ of the PSCs. (d) Ultraviolet–visible (UV-Vis) absorption spectra of a PffBT4T-2OD film and a PffBT4T-2OD solution (0.02 mg ml−1 in DCB) at temperatures as indicated.
