Electrochemical-based studies of Cu2SnSe3 nanocrystals and P3HT:PCBM for hybrid solar cells

In this work, we have fabricated hybrid heterojunction solar cells with structure ITO/ZnO/P3HT:PCBM:CTSe NCs (optimized weight percentage 10 wt%)/MoO 3 /Ag (device SM10). A thin layer of molybdenum oxide MoO 3 prepared by peroxomolybdic acid organosol as the precursor was used as hole transport layers (HTLs). The performance of the device was compared with ITO/ZnO/P3HT:PCBM:CTSe NCs/Ag(device S10). The important parameters such as global charge carrier mobility (µ), effective charge carriers lifetime ( τ n ) and charge diffusion time ( τ d ) have been extracted from electrochemical impedance spectroscopy (EIS) performed at the bias of 0.1 V in the dark. The Nyquist plot obtained from EIS has demonstrated effective carriers lifetime, global mobility and charge diffusion time for a device SM10 as 6.46 ms, 12.6 × 10 −4 cm 2 V −1 S −1 and 5.2 µs and for device S10 as 5.65 ms, 9.58 × 10 −4 cm 2 V −1 S −1 and 6.8 µs, respectively.