Full descriptionExperimental details Supporting figures Materials Preparation of methylammonium iodide (MAI) Device fabrication Dual-source evaporation Figure S1: Optical absorption characterisation of CH3NH3PbI3 perovskite/polymer bilayer films. Figure S2 Typical CH3NH3PbI3 perovskite solar cells performance with different polymer p-type interlayers. Table S1 Solar cells performance statistics of perovskite solar cells (6 devices each) prepared using different polymer p-type interlayers. *Data for the devices prepared using DPP-DTT as the interlayer have limited statistics as most were shorted due to poor film uniformity. Figure S3 Scanning Electron Microscopy images of CH3NH3PbI3 perovskite film surfaces prepared under various thermal evaporation conditions (dual source evaporation temperatures). Figure S4 X-ray Diffraction (XRD) characteristics of perovskite films prepared at various PbI2 evaporation temperatures with fixed MAI temperature (100 °C). Figure S5 Flow chart showing the measurement technique used to obtain the perovskite optical constants (n, k). Figure S6 Static dielectric constant measured by Charge Extraction Under Linearly Increasing Voltage (CELIV). Figure S7 Optical constants (n, k) for all the non-junction materials used in this paper. Figure S8 Electro-optic modeling of the maximum short circuit current (Jsc) as a a function of the interlayers and perovskite junction thicknesses. Figure S9 Hysteresis of optimised CH3NH3PbI3 perovskite solar cells. Figure S10 Long term stability of CH3NH3PbI3 perovskite solar cells. Figure S11 Light intensity dependent short circuit current density of an optimised CH3NH3PbI3 perovskite solar cell.
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