Table 1. PLQE of the Perovskite Thin Films Measured before and after Storage in Humid Nitrogen (50% RH) for 24 h^a.

	PLQE (%)
sample	before	after
TC	18.6	27.9
Rb-passivated TC	22.8	12.9
K-passivated TC	39.5	49.6

^aFilms were illuminated with a 532 nm laser at an excitation intensity equivalent to 1 sun (∼60 mW·cm^–2).