Fig. 2: Stacked-detector architecture and performance.
From: Vertically stacked monolithic perovskite colour photodetectors
a, Cross-section scanning electron microscopy image of full-colour stacked-perovskite photodetector (photosite), structure 1. The right part of the image is colour-highlighted and labelled with the layer descriptions. Scale bar, 500 nm. 2PACz, (2-(9H-carbazol-9-yl)ethyl)phosphonic acid; PCBM, (6,6)-phenyl C61 butyric acid methyl ester; TCTA, 4,4′,4-tris(carbazol-9-yl)triphenylamine; AZO, aluminium zinc oxide. b, Absorption spectra of MAPbBrI2, CsPbBr2I and CsPbBr2Cl individual films used as absorber materials for R, G and B channels (pixels), respectively. c–e, J–V characteristics (dashed lines are dark; solid lines are illuminated traces) of champion B (c), G (d) and R (e) colour pixels of the full-colour detector. Illumination power density was set to be 1 mW cm−2 for each colour. f, The noise spectral density (in rms, root mean square) of the green channel of the full-colour detector was measured under illumination and in dark conditions. Other colour pixels are shown in Extended Data Fig. 2. g, Linearity of the full-colour stacked-detector response for R, G and B pixels.
