Fig. 1: Molecular structures and composition-dependent VOC. | Nature Energy

Fig. 1: Molecular structures and composition-dependent VOC.

From: Origins of the open-circuit voltage in ternary organic solar cells and design rules for minimized voltage losses

Fig. 1

a, Molecular structures of the donors (PM6 and PBDB-T), non-fullerene acceptors (Y6, Y1, IT-M, ITCC and IEICO-4F) and fullerene derivatives (PC71BM and Bis-PC62BM) studied in this work. b, VOC measured under AM1.5g 100 mW cm−2 conditions (which are the average values of at least two devices and plotted with bright-red spheres) and VOC calculated by equation (1) (plotted with dark-red circles). The insets are the energetic levels of the materials approximated from cyclic voltammetry measurements (Supplementary Fig. 2 and Supplementary Table 2). The variations of VOC for the same binary blends in different ternary systems (for example, different VOC values of PBDB-T: PC71BM in PBDB-T: Y1: PC71BM and PBDB-T: IEICO-4F: PC71BM) are due to the fact that different fabrication recipes are used (Supplementary Table 3).

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