Fig. 4: Interchain effect of TTF-CA.
From: Releasing the hidden shift current in the TTF-CA organic molecular solid via symmetry lowering
a Schematic diagrams of the interchain charge shift in the neutral phase and asymmetric–neutral phase. b The maximum shift current of the neutral phase of TTF-CA with respect to interchain distance Δd, which is depicted in the inset of the schematic configuration. c The photocurrent of chain direction, calculated by rtp-TDDFT, in the neutral phase TTF-CA with/without a uniform DC field applied in the chain-normal direction. The inset depicts the symmetry-breaking uniform field in the z direction together with an oscillating field applied in the x direction.
