Figure 1: Optical and Structural characterization.
From: One-Year stable perovskite solar cells by 2D/3D interface engineering
(a) Absorption spectra of the (HOOC(CH2)4NH3)2PbI4 (blue dashed line), 3D CH3NH3PbI3 (black line) and 2D/3D (red line) using 3% of HOOC(CH2)4NH3I, AVAI hereafter. In the inset the intensity of the peak at 420 nm with increasing the percentage of AVAI to PbI2. (b) Raman spectra for 100%AVAI (panel I.), 3%AVAI (panel II) and 0%AVAI (panel III) perovskites. Solid lines represent the fit from multi-gaussian peaks fitting procedure (Supplementary Fig. 3 for details). For 3D perovskite main peak at: 78, 109 and 250 cm−1; for 2D at: 73, 109, 143, 171 cm−1 and for 2D/3D at: 62, 87, 112, 143, 169 cm−1; (c) X-Ray diffraction pattern of 100%AVAI (panel I); 3%AVAI (panel II) and 0%AVAI (panel III) perovskite. Peaks denoted with a star originate from the FTO/TiO2 substrate. (d) Zoom of the X-ray diffraction pattern comparing the 3%AVAI with the pure 0%AVAI perovskites at selected angles. Substrate: mesoporous TiO2.
