High performing air stable inverted perovskite solar cells using nanostructured CuSCN thin film as hole transport material

Abstract

Abstract In this article, the growth of CuSCN nanorods and nanowires by changing the electrodeposition potential and time is presented. The dependency of growth of CuSCN nanostructures with applied potential and time is demonstrated. The inverted perovskite solar cells (PSCs) are fabricated using thin films of electrodeposited CuSCN nanorods and nanowires. The maximum photovoltaic performance is observed with two dimensional (2D) nanorods grown for 3\xa0min at all the applied potentials compared with other CuSCN nanostructures grown by various deposition time and potentials. The cone-shaped CuSCN nanorods grown at the applied potential of −450 mV delivers the highest photocurrent (Jsc\xa0=\xa021.11\xa0mA/cm2) and power conversion efficiency (η\xa0=\xa012.42%) for the PSCs with the area of 0.75\xa0cm2. The interrelation between the CuSCN nanostructures and photovoltaic performance is systemically investigated. The charge transfer resistance and the capacitive behaviour of CuSCN layers are analysed by electrochemical impedance spectroscopy. The highest electron lifetime of 15.60 μs is observed for the PSCs fabricated with cone-shaped CuSCN nanorods grown at the applied potential of −450 mV for 3\xa0min. The PSCs stability is tested under an open atmosphere with humidity >60% and retains 80% photovoltaic performance and stability for 50 days under atmospheric condition.