Charge transport and impedance analysis of solution‐processed perovskite‐based device

Herein, this work scrutinises the charge transport properties of solution-processed methylammonium lead iodide (MAPbI3) perovskite-based hole only device through the DC current–voltage and AC impedance spectroscopy analysis. The device shows a significant increase in the current levels under illumination. Key diode parameters were estimated from the dark I–V curves. The dominance of Ohm's law at low bias, space charge limited conduction (SCLC) followed trap controlled SCLC at higher applied bias was observed from charge transport analysis. From the region dominated by the trap free SCLC, the hole mobility of 4.02 × 10−6 cm2 V−1 s−1 inside the perovskite layer was extracted. The measured impedance spectrum was analysed by fitting it with the equivalent circuit model, and the various physical parameters, such as charge transport resistance, recombination resistance and associated capacitance were approximated for the device.