Thin film and sheet PbS quantum dots (QDs) concentrators
were synthesized by sol–gel method using three
different PbS concentrations (0.14, 0.2, and 0.4 mol %). The
structure and morphology of the prepared PbS QDs were characterized
by X-ray diffraction (XRD), Scan electron microscopy
(SEM), and Transmission electron microscopy (TEM).
The photostability of the PbS QDs concentrators under outdoor
exposure to sunlight for 8 weeks was studied. The results
showed that the PbS QDs sheet with PbS concentration
(0.14 mol %) has the highest luminescence intensity. The
sheet PbS QDs concentrator was used to couple with PV solar
cell and the corresponding photoelectric conversion efficiency
wasmeasured under sun light illumination. I–V characteristics
of the photovoltaic devices, both open circuit voltage and
short circuit current were improved as compared to the device
without collector. This indicates that the proposed technique is
very useful for improving the efficiency of solar cell.