1 research outputs found
Ultrawide Spectral Response of CIGS Solar Cells Integrated with Luminescent Down-Shifting Quantum Dots
Conventional
CuÂ(In<sub>1–<i>x</i></sub>,Ga<i><sub>x</sub></i>)ÂSe<sub>2</sub> (CIGS) solar cells exhibit
poor spectral response due to parasitic light absorption in the window
and buffer layers at the short wavelength range between 300 and 520
nm. In this study, the CdSe/CdZnS core/shell quantum dots (QDs) acting
as a luminescent down-shifting (LDS) layer were inserted between the
MgF<sub>2</sub> antireflection coating and the window layer of the
CIGS solar cell to improve light harvesting in the short wavelength
range. The LDS layer absorbs photons in the short wavelength range
and re-emits photons in the 609 nm range, which are transmitted through
the window and buffer layer and absorbed in the CIGS layer. The average
external quantum efficiency in the parasitic light absorption region
(300–520 nm) was enhanced by 51%. The resulting short circuit
current density of 34.04 mA/cm<sup>2</sup> and power conversion efficiency
of 14.29% of the CIGS solar cell with the CdSe/CdZnS QDs were improved
by 4.35 and 3.85%, respectively, compared with those of the conventional
solar cells without QDs