Supplementary Information

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1 Supplementary Information How Important is the Organic Part of the Lead Halide Perovskite Photovoltaic Cells? Efficient CsPbBr 3 Cells Michael Kulbak, David Cahen* and Gary Hodes* Dept. of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel Figure. S1a. Direct bandgap Tauc plot of CsPbBr 3 layer from Figure 1. Figure S1b. As above, but indirect bandgap plot.

2 Figure S2. XRD of CsPbBr 3 on glass.

3 Figure S3a. Al 2 O 3 -based cell with spiro HTM. Figure S3b. Al 2 O 3 -based cell with no HTM.

4 Reference Cell structure Efficiency V OC (V) J SC Fill factor (%) (ma/cm 2 ) 1 Ti/PTAA Ti/PCBTDPP Al/PDI Ti/Spiro P Form. 5 Al/CBP Ti/no HTM Ti/PIF8-TAA Al/spiro Ti/CBP P Ti/Spiro P Form Ti/PIF8-TAA P Al/no HTM Ti/spiro Table S1. Photovoltaic parameters of MAPbBr 3 cells (except where formamidinium was used in place of methyl ammonium, in which case, Form. is added to the cell structure column) from previous literature. The references are ordered according to submission date (earliest at the top). In the Cell structure column, Ti and Al refer to TiO 2 and Al 2 O 3 and P shows the cell was planar (all other cells were mesoscopic). The full chemical names of the HTM acronyms are listed below. List of HTMs shown in Table 1. PTAA poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] {5.2} PCBTDPP Poly[N-90-heptadecanyl-2,7carbazole-alt-3,6-bis(thiophen-5-yl)-2,5- dioctyl-2,5-dihydropyrrolo[3,4]pyrrole-1,4-dione] {3.9/5.4} PDI N,N -dialkyl perylenediimide{3.7/5.8} CBP 4,4 -bis(n-carbazolyl)-1,1 -biphenyl {5.7} PIF8-TAA poly-indenofluoren-8-triarylamine {5.51} Spiro spiro-ometad [2,2,7,7 -tetrakis-(n,n-di-p-methoxyphenylamine)- 9,9 -spiro-bifluorene] {5.0} The values in the curly brackets are the LUMO/HOMO values, respectively, of the HTMs taken from the literature. Where only one value is shown, it is the HOMO level.

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