Vikrant Sista Roll No: EE10S012 IR and UV solar cells for
windows and energy scavenging applications
Slide 2
Sources Richard R Lunt and Valdamir Bulovic, Transparent,
near-infrared organic photovoltaic solar cells for window and
energy-scavenging applications, Appl. Phys. Lett. 98, 113305 (2011)
Man Gu Kang et.al., Manufacturing method for transparent electric
windows using dye-sensitized TiO2 solar cells, Sol. Energ. Mat.
Sol. C., 75, 475 (2003)
Slide 3
Outline Motivation Introduction IR solar sell device and
performance UV solar cell device and performance Summary
Slide 4
Motivation Reflective or tinted windows used in automobiles and
buildings Using low cost transparent PV technology the reflected
ight will be used for energy generation Absorbing UV and IR and
transmitting visible allows for lighting Combined advantage of
power generation,lighting and temperature control
Slide 5
IR Solar cell Hetero Junction PV Chloroaluminumpentac ene
(molecular donor) C 60 (molecular acceptor) BBAR Broadband
Antireflection coating DBR Distributed Bragg Reflector(stop band
800nm)
Slide 6
IR Solar Cell Fabrication Glass substrate coated with ITO
Thermal evaporation of MoO 3,ClAlPc,C 60,BCP RF sputtering of ITO
directly on BCP DBR sputtered separately on quarts substrate BBAR
precoated on quartz substrate and attached to glass substrate using
index matching fluid
Slide 7
IR Solar Cell: Performance Efficiency(Open Diamond) Average
Visual Transmission(Open Star) Open Circuit Voltage(triangles)
Fill-Factor(square) Short Circuit Current(circle)
Slide 8
IR Solar Cell: Performance Transmission spectra of the OPV
device for various ITO thickness and with and without NIR
mirror
Slide 9
IR Solar Cell: Performance Picture (a) without the transparent
OPV Picture (b) with OPV Picture (a) shows the OPV region overlaid
on it with orange boxed showing active area A series integrated OPV
powering a LCD clock
Slide 10
UV solar cells UV solar cells are not a major focus for energy
scavenging applications as not much UV reaches surface But solar
cells are still developed which absorb in UV range Three approaches
exist Shift UV to another region and then use in a regular solar
cell(Turbo Solar) Harness using GaN doped with Magnesium Dye
N719
Slide 11
UV Solar Cell Dye +TiO2 active region Dye (N719) used for UV
absorption Exposure to light excites the dye and electron injected
into the TiO 2 Dye then absorbs electron form Pt/electrolyte
Slide 12
UV Solar Cell: Fabrication TiO2 colloid made into slurry and
coated on glass substrate with ITO coated Substrate then immersed
in solution with N719 dye for 24 hours to sensitize it Platinum
electrode formed by spreading hexachloroplatanic acid over glass
substrate and heating Iodide electrolyte introduced through the
holes in platinum electrode glass Finally the two substrates are
sealed using surlyn Holes in the glass substrate covered using
surlyn and glass
Slide 13
UV Solar cell: Performance UV to visible absorption of N719
dye
Slide 14
Prototype of the designed Window
Slide 15
UV Solar cell: Performance Average Visible transmittance is 60%
The solar cell has a Voc of 0.64V and J sc of 250mA and area of
each solar cell is 64cm 2 Series connection of 9 such solar cell
gives a open circuit voltage of 5.7V and a J sc of 220mA at one sun
condition