A general model of calculating the short circuit photocurrent and exciton diffusion length from Schottky diode is given here using optical interference method. This method of estimating the exciton diffusion length can be very useful for those materials that do not give photoluminescence. It also serves as an accurate and simple method to determine the exciton diffusion length, which is an important material property to design devices such as organic solar cells. Our model is verified with the spectral response of indium tin oxide (ITO)/copper phthalocyanine (CuPc)/Al and ITO/CuPc/Ag Schottky diodes.

In this work, methylammonium lead tri-iodide perovskite has been synthesized by spin coating of lead acetate trihydrate and methylammonium iodide precursor on preheated substrate. Significant difference in film morphology has been observed as the temperature was varied from room temperature to 120 °C prior to spin coating. Nucleation and growth mechanism is revisited to find out the optimum substrate temperature for fabricating uniform perovskite films and is attributed to the fast homogeneous nucleation followed by delayed growth process. Electrochemical impedance spectroscopy measurement at the perovskite−liquid electrolyte interface reveals the impact of film morphology on the anomalous diffusion behavior observed at the low frequency regime.

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