Ultra-thin perovskite absorber layers have attracted increasing interest since
they are suitable for application in semi-transparent perovskite and tandem
solar cells. In this study, size and density controlled plasmonic silver
nanoparticles are successfully incorporated into ultra-thin perovskite solar
cells through a low temperature spray chemical vapor deposition method.
Incorporation of Ag nanoparticles leads to a significant enhancement of 22.2%
for the average short-circuit current density. This resulted in a relative
improvement of 22.5% for the average power conversion efficiency.
Characterization by surface photovoltage and photoluminescence provides
evidence that the implemented silver nanoparticles can enhance the charge
separation and the trapping of electrons into the TiO2 layer at the
CH3NH3PbI3/TiO2 interface. The application of these silver nanoparticles
therefore has promise to enhance the ultra-thin perovskite solar cells.