Dep. of Energy, CIEMAT, Av. Complutense 22, 28040 Madrid, Spain
energy efficient by using passive elements is as important as
integrating active elements to use renewable energy for building
needs. Proper architectural glazing can significantly reduce energy
use for space conditioning. In addition, the incorporation of
photovoltaic solar panels can provide enough electric power for
Solar cells based on
polycrystalline thin films have become in recent years an
interesting alternative to the widely used silicon based cells; this
is due to the
high conversion efficiencies achieved in combination with their
stability and optimist production costs.
The structure of this type of cells is basically constituted by a
substrate (typically glass), a back contact layer, an absorber film
(active photovoltaic layer in the cell), a window layer and a front
is an excellent candidate to be used as absorber film due to its
direct band energy gap of 1.5 eV.
is a direct semiconductor, solar cells with a total thickness of
just a few micrometres are enough to ensure an optimum performance
of the photovoltaic device.
The possibility of
producing coevaporated Cu-rich and Cu-poor CuInS2
films by proper modulation of the elemental evaporation fluxes and
the associated advantages/disadvantages will be discussed.
The second part of the
presentation will focus on copper sulphide (CuS) thin films to be
used as effective solar control glazing. In particular, the
influence of the thickness on the morphology and the optical
properties of coevaporated CuS films will be analyzed. The results
show near ideal optical properties for application as window
coatings, especially in warm climates where cooler rooms are