Abstract:
In this work, novel semiconductor nanocomposites have been synthesized by wet
chemical methods for semiconductor nanocrystal based thin film solar cells. These
nanocomposites have been employed for three basic components of the solar cells
including sensitizer layer, passivation layer and counter electrode. For sensitizer
layer, ZnS-Cu-GO composite has been synthesized and applied in device
configuration ITO/ZnO/ZnS-Cu-GO/polysulfide/Ag. And for passivation layer
another device configuration FTO/TiO2/CdS/ZnS (XNO3, X=Cu, Mg, Cu,
K)/polysulfide/ (Metal sulfide). Four metal sulfides namely ZnS, MgS,Ag2S, CoS
as counter electrodes were grown on FTO substrates via electrodeposition
technique. Structural, morphological, optical and electrical properties of the
synthesized nanomaterials were studied to develop an understanding of their
absorption and emission properties, structural defects and possible defect states,
charge transport mechanism and J-V characteristics which significantly contribute
to the solar cell operation collectively. The samples were characterized using XRD,
Raman spectroscopy, Atomic force microscopy (AFM), Scanning electron
microscopy (SEM), UV-vis spectroscopy, PL spectroscopy. Impedance
spectroscopy (EIS) and J-V measurements. The charge transport and recombination
mechanism depending upon the formation of energy states is studied by measuring
electrochemical and optical parameters.
