Fig. 2: Understanding superior spectral stability of VAC-treated devices.
From: Mixed halide perovskites for spectrally stable and high-efficiency blue light-emitting diodes
a–d Photophysical characterizations for control and VAC-treated perovskite films: Fluence-dependent PLQYs (a); PL decay measured by TCSPC (b). PL spectra (c); Transient absorption of control (top) and VAC-treated films (bottom) after excitation at 400 nm (d). e, f Derivatives of temperature-dependent capacitance versus frequency plots for control (e) and VAC-treated (f) devices. The blue arrows indicate temperature change from 350 K to 200 K. Here, two mobile ions marked as β and ε are visible.
