Supporting Information Reduced Hysteresis and Enhanced Air Stability of Low-Temperature Processed Carbon based Perovskite Solar Cells by Surface Modification

17 pages. -- Figure S1. XRD patterns of perovskite films with and without HTAB perovskite films. -- Figure S2. Fitting results from Figure 4b using CasaXPS software. -- Figure S3. XPS core-level spectra of C 1s of pristine and modified perovskite films. -- Figure S4. XPS spectra (a) Pb 4f and (b)I 3d (c)survey spectrum for I 4d, Br 3d, Pb 4f, Br 3p and C 1s (d) enlarged image of C 1s of pristine and passivated perovskite films. -- Table S1. X-ray photoelectron spectroscopy (XPS) quantification analysis with and without HTAB treatment perovskite films from Figure S1c. -- Table S2.Calculated atomic ratios from data of Table S1. -- Figure S5. SEM combined with EDS mapping for HTAB modified perovskite film. -- Figure S6.Raman spectra of perovskite films with and w/o HTAB modification. -- Table S3. EIS Fitting parameter from Nyquist plot. -- Figure S7. VOC decay of w/o MAI containing pristine and HTAB passivated perovskite films. -- Figure S8. J-V curves of C-PSCs using different concentration of HTAB (1 mM and 2mM in IPA) as with and w/o passivated devices. -- Table S4. Photovoltaic parameters of C-PSCs derived from J-V curves using different concentration of HTAB with and w/o modified devices. -- Figure S9. Statistical distribution of the photovoltaic parameters for 2 mM HTAB as passivated devices for 10 devices. -- Figure 10. -- Table S5. Photovoltaic parameters of C-PSC prepared without MAI in solution [1], either with or w/o HTAB passivation. Figure 11-15. -- Table S6. Stability test under low humidity (RH ~20 ± 5%) at room temperature over 1700 h. VOC is increased from 0.97 to 1.02 V.Peer reviewe