Fig. 2: Modulate the intermediate phase via NVAL additive, to suppress the phase-segregation.
From: High-performance large-area quasi-2D perovskite light-emitting diodes
a Schematic diagram for nucleation and growth processes of quasi-2D perovskite without and with NVAL. DFT simulation indicated the NVAL surface-anchored intermediate phase possesses lower formation enthalpy. b, c Steady-state UV–vis spectra at different spin-coating times to probe the perovskite phase evaluation of the quasi-2D perovskite films without and with NVAL. d, e TA spectra at selected timescales of the quasi-2D perovskite films without and with NVAL. f Relative contents of different phases for quasi-2D perovskite films without and with NVAL, the relative contents were obtained according to the amplitude of GSBs in TA spectra at 0.25 ps.
