1 research outputs found
Multiple-Color-Generating Cu(In,Ga)(S,Se)<sub>2</sub> Thin-Film Solar Cells via Dichroic Film Incorporation for Power-Generating Window Applications
There are four prerequisites when
applying all types of thin-film
solar cells to power-generating window photovoltaics (PVs): high power-generation
efficiency, longevity and high durability, semitransparency or partial-light
transmittance, and colorful and aesthetic value. Solid-type thin-film
CuÂ(In,Ga)ÂS<sub>2</sub> (CIGS) or CuÂ(In,Ga)Â(S,Se)<sub>2</sub> (CIGSSe)
PVs nearly meet the first two criteria, making them promising candidates
for power-generating window applications if they can transmit light
to some degree and generate color with good aesthetic value. In this
study, the mechanical scribing process removes 10% of the window CIGSSe
thin-film solar cell with vacant line patterns to provide a partial-light-transmitting
CIGSSe PV module to meet the third requirement. The last concept of
creating distinct colors could be met by the addition of reflectance
colors of one-dimensional (1D) photonic crystal (PC) dichroic film
on the black part of a partial-light-transmitting CIGSSe PV module.
Beautiful violets and blues were created on the cover glass of a black
CIGSSe PV module via the addition of 1D PC blue-mirror–yellow-pass
dichroic film to improve the aesthetic value of the outside appearance.
As a general result from the low external quantum efficiency (EQE)
and absorption of CIGSSe PVs below a wavelength of 400 nm, the harvesting
efficiency and short-circuit photocurrent of CIGSSe PVs were reduced
by only ∼10% without reducing the open-circuit voltage (<i>V</i><sub>OC</sub>) because of the reduced overlap between the
absorption spectrum of CIGSSe PV and the reflectance spectrum of the
1D PC blue-mirror–yellow-pass dichroic film. The combined technology
of partial-vacancy-scribed CIGSSe PV modules and blue 1D PC dichroic
film can provide a simple strategy to be applied to violet/blue power-generating
window applications, as such a strategy can improve the transparency
and aesthetic value without significantly sacrificing the harvesting
efficiency of the CIGSSe PV modules