application of au@sio2 plasmonic nanoparticles at interface of tio2 mesoporous layers in perovskite solar cells

To investigate the plasmonic effect in perovskite solar cells, the effect of depositing au@sio2 nanoparticles on the top and the bottom of mesoporous tio2 layers was studied. first, au@sio2 nanoparticles were synthesized. the particles were then deposited at the different interfaces of mesoporous tio2 layers. although the two structures show approximately similar optical absorption, only cells with au@sio2 nanoparticles deposited at the bottom of the mesoporous tio2 layers demonstrated an improved photocurrent performance compared to the reference cells. this structure shows a shortcircuit current density (jsc) of 20.7 ma/cm² and open circuit voltage of 1081 mv. this enhancement may be attributed either to the interface surface engineering or plasmonic resonance of au@sio2 nanoparticles depends to the nps size and position.