Fig. 3: Effects of perovskite thickness on photon collection.
From: Enhanced optical path and electron diffusion length enable high-efficiency perovskite tandems
a–d Top and cross-sectional SEM views of perovskite films with different thicknesses (a 400 nm, b 500 nm, c 700 nm, d 700 nm with larger grains) deposited onto glass/ITO/SnO2 substrates. e Statistical distribution of grain size obtained by SEM images from a–d films. The scale bar is 500 nm. f Measured EQE spectra of semi-transparent (solid line) and back-mirrored (dashed line) devices with varying perovskite absorber layer thickness. g Difference of EQE spectra between thicker perovskite devices compared to control device with 400 nm thickness.
