Figure 1. (a) Chemical structures of polymer donor and non-fullerene acceptors, and the device architecture used in this work. (b) Schematic energy diagrams of PBDB-T, IT-M and m-INPOIC, here the lightning bolt indicates the related energy transfer process. (c) Optical absorption spectra of neat films of PBDB-T, m-INPOIC and IT-M. (d) PL spectra of m-INPOIC, IT-M and their mixtures at the weight ratios of 9:1 and 8:2, excited with a 532 nm laser.
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