Sb 2 S 3 grown by ultrasonic spray pyrolysis and its application in a hybrid solar cell

Abstract

Chemical spray pyrolysis (CSP) is a fast wet-chemical deposition method in which an aerosol is guided by carrier gas onto a hot substrate where the decomposition of the precursor chemicals occurs. The aerosol is produced using an ultrasonic oscillator in a bath of precursor solution and guided by compressed air. The use of the ultrasonic CSP resulted in the growth of homogeneous and well-adhered layers that consist of submicron crystals of single-phase Sb 2 S 3 with a bandgap of 1.6 eV if an abundance of sulfur source is present in the precursor solution (SbCl 3 /SC(NH 2 ) 2 = 1:6) sprayed onto the substrate at 250 °C in air. Solar cells with glass-ITO-TiO 2 -Sb 2 S 3 -P3HT-Au structure and an active area of 1 cm 2 had an open circuit voltage of 630 mV, short circuit current density of 5 mA/cm 2 , a fill factor of 42% and a conversion efficiency of 1.3%. Conversion efficiencies up to 1.9% were obtained from solar cells with smaller areas.