Activity: Self cleaning and anti reflective coating on solar
cover glass
Antireflective coating : Bare silicon has a high surface
reflection of over 30%.the reflection is reduced by texturing and
by applying ARC coating on solar cell .This is important that we
want as much sunlight to pass through the glass and as little as
possible to be reflected ,In order to maximize electricity
generation.
Self cleaning: Self cleaning glasses are the one that keep
their surface clean from dirt and dust. self cleaning coating
on glasses used in solar panels protect solar cell. The loss on
solar panel’s efficiencies may range as high 35-40% in some
areas due to dust ,grime, particulate matter etc. The
plausible solution to this problem can be achieved by using
self-cleaning coating techniques.
I.
Our work is about water assisted selfcleaning techniques
Superhydrophilic
&
photocatalytic surface
coating: coatings with
photocatalytic properties
absorb light(uv-vis) that
turn causes dirt or other
foreign particles on the
surface to slowly loosen or
break
down
via
oxidation.Also, By virtue of
superhydrophilicity water
.seeps under fouling and
carry it away from the
surface due to inclination
PV panels
Our work: Non lithographic
black copolymer directed self
assembled and plasma treated
self-cleaning
transparent
coating
for
photovoltaic
modules and other solar
energy devices. Solar energy
materials and solar cells
2018,188,127-139
Superhydrophobic Surface
Coating :
a) Such coatings are
modelled on the lines of
lotus leaf structure. The
leaves of the lotus plant
have the outstanding
characteristic of totally
repelling water.
b) The water droplets roll
off the surface easily
due to hierarchical
nature of the new
surface created(very low
surface energy) by such
coatings.
c) As they roll, dirt
particles cling to the
beads and are removed
with them hence a
natural “Self-cleaning”
If the intensities of two beams
and are exactly equal, they will
destructively
interfere
and
cancel each other, since they are
exactly out of phase. There is no
reflection from surface, all
energy of beam must be in the
transmitted ray.
II. Layer's thickness is controlled
precisely, such that it is exactly
one quarter(λ/4 = λ0/4n1) of the
wavelength of light in the layer,
where λ0
is the vacuum
wavelength. The layer is then
called a quarter wave coating.
Biomimicry: Moth's eye
surfaces covered with a
natural nanostructured film
which eliminate reflections.
The structure consists of
hexagonal pattern of bumps,
bumps are smaller than
wavelength of visible light.
So, the light sees the surface
as having a continuous
refractive index gradient
between air and medium,
which decreases reflection
by effectively removing airlens interface.
Surface texturing: Rough surface
reduce reflection by increasing
cancel of reflective rays bouncing
back on surface. Light get a second
chance to get absorbed.
Our work: Antireflactive and self-cleaning coating
with enhance transmission for solar cover glass.
.
super hydrophilic surface
(CA<5°)