Fig. 1: Molecular structures.
From: Elimination of charge-carrier trapping by molecular design

a,b, Structural formulas of series 1 consisting of 1CzTrz, 2CzTrz, 3CzTrz, 4CzTrz and 5CzTrz (a), and series 2 consisting of DTPT-DCz, DTPT-DFCz and DTPT-D2FCz (b). The triazine acceptor is indicated in pink, whereas the colour of the carbazole donor is varied, corresponding to the symbols of the J–V characteristics in Fig. 2.