Boosting efficiency of eco-friendly perovskite solar cell through optimization of novel charge transport layers

Formamidinium tin triiodide (FASnI3)is a suitable candidate for the
absorber layer in perovskite solar cells (PSC) because of its
non-toxicity, narrow band gap, thermal stability,y and high carrier
mobility. This study focuses on the analysis and improvement in the
performance of FASnI3-based PSCs using various inorganic charge transport
materials; copper-based materials such as Cu2O, CuAlO2, CuSCN and CuSbS2
are introduced as hole transport layers due to their earth abundancy, ease
in manufacturing, high charge mobilities and chemical stability.
Similarly, fullerene derivates (PCBM and C60) are deployed as electron
transport layers due to their mechanical strength, thermal conductivity
and stability. The effect of these materials on the optical absorption,
quantum efficiency, energy band alignment, band offsets, electric field
and recombination are studied in detail. The reasons for low performance
of the cell are identified and improved through design optimization. The
PSC performance is analyzed in both inverted and non-inverted
architecture. Among all the structures, the best result is achieved
through ITO/CuSCN/FASnI3/C60/Al with an efficiency of 27.26%, Voc of 1.08
V, Jsc of 29.5 mA/cm2, and FF of 85.6%.