| dc.description.abstract | Organic-inorganic halide perovskites have garnered a lot of attention in the field of
photovoltaic materials research. This novel PV material possesses a combination of
remarkable optoelectronic properties, such as steep optical absorption edge and high
absorption coefficients, long charge carrier diffusion lengths and lifetimes. Solution
processability, cheap starting materials, and striking optoelectronic properties have these
materials a cheaper alternative to the quite expensive widely used polycrystalline silicon
for photovoltaic applications.
The focus of this study is on improving efficiency of the inverted planar organicinorganic
halide perovskites based solar cell with
glass/ITO/PEDOT:PSS/Perovskite/PCBM/TiOx/Al layers stack. To improve efficiency, a
layer by layer approach of optimization was adopted and the effects of each step were also
compared as the perovskite synthesis route was varied. Results show that while room
temperature methylamine gas treatment improved the crystallinity of MAPI (CH3NH3PbI3-
xClx) perovskite, it converts CsMAFA (Cs5(FA0.83MA0.17)95Pb(I0.83Br0.17)3) perovskite to its
non-photovoltaic yellow polymorph. We found improved crystal growth for the CsMAFA
perovskite is best achieved via DMF solvent vapor annealing. Through PEDOT:PSS and
PCBM layers optimization, a maximum PCE of 2.11% and 13.49% were achieved for
MAPI and CsMAFA perovskites solar cells respectively. | en_US |
