Figure 1: Structure and UV–vis absorption of IDTBR acceptors.
From: High-efficiency and air-stable P3HT-based polymer solar cells with a new non-fullerene acceptor
(a) Chemical structures of O-IDTBR and EH-IDTBR; (b) Optimized conformation of IDTBR as calculated by DFT (B3LYP/6–31G*)) with methyl groups replacing alkyl chains for clarity; (c,d) UV–vis absorption spectra of (c) EH-IDTBR and (d) O-IDTBR in chloroform solution (1.5 × 10−5 mol l−1), thin film (spin-coated from 10 mg ml−1 chlorobenzene solution) and thin film annealed at 130 °C for 10 min. DFT, density functional theory.
