Natural tomato slurry as photosensitizers for dye-sensitized solar cellwith Tio2/Cuo composite thin films.

1. “ NATURAL TOMATO SLURRY AS
PHOTOSENSITIZERS FOR DYE-SENSITIZED
SOLAR CELL WITH TiO2/CuO COMPOSITE THIN
FILMS ”
Presented by :- Meet A. Moradiya
Guided by :- J.H. Markna
(V.V.P. Engineering College, Rajkot)

2. OUTLINE
1. Introduction of DSSC
2. Component involve in DSSC
3. Synthesis and working of DSSC
4. Preparation of DSSC cell
5. Selected results
6. Conclusion

3. INTRODUCTION
• Dye- sensitized solar cell(DSSC) is the 3rd generation
solar cell which Comprises of semiconductor
electrode, counter electrode and electrolyte.
• The principle of power generation of DSSC is very
similar to that of photosynthesis of plants.
• A DSSC takes solar energy and converts it into
electrical energy.
• DSSC often referred to as artificial photosynthesis.

4. INTRODUCTION
• The use of natural dye extracted provides natural,
non-toxic and low cost dye source with high
absorbance level of UV and visible.
• examples of such dye sources are henna, strawberry,
spinach, red cabbage, beet etc...
• In the present work dye sensitized solar cells were
fabricated using natural dye ‘anthocyanin’ extracted
from tomato as ‘sensitizer’.

5. COMPONENTS
The DSSC device consists of 5 components :
• Glass sheet :-
transparent conducting oxide ITO
• Semiconducting electrode :-
TiO2/CuO
• Dye-Sensitizer :-
tomato slurry in ‘anthocyanins’
• Electrolyte :-
Iodolyte
• Counter electrode :-
copper plate

6. DSSC WORKING SCHEME

7. MECHANISM OF DSSC
S + photon S * (1) Excitation process
S* + TiO2/CuO e-
( TiO2/CuO) + S+
+ e-
S+ S
I3
- + 2e- 3I-
(2) Injection process
(3) Re-generation of Dye
(4) e- Recapture reaction

8. SYNTHESIS OF TiO2/CuO
(10 ml) TiCl4 + (50 ml) water 0.6 M (Cu(CH3COO)2 · 2H2O
+
(5 gm) NaCl + (50 ml)
water
Added 20 ml PEG
Washed & dried at 90°C for
24hrs.
Calcined at 700°C for 2 hrs.
Dissolved in HCl (20 ml)
Stirred at 500 rpm and 90°C
for 1.5 hrs.
Calcined at 650°C for 3 hrs.
Finally, stoichiometry of TiO2
and CuO (95:5) by weight

9. PREPARATION OF DSSC
Working electrode Counter electrode
TiO2/CuO
Coating &
firing
Dye-absorbing
UV Curing
Sealing & injecting
electrolyte
Sealing holes
& cell test
Copper plate
Hole drilling

10. SELECTED RESULTS
• XRD Analysis
T =
𝐾 λ
𝛽 𝐶𝑂𝑆 𝜃
Where,
K= constant (0.89),
λ = wavelength (1.54Å),
β = full width half
maxima,
θ =diffraction angle.
XRD of TiO2/CuO composite

11. SELECTED RESULTS
• UV-Vis Spectrum
(a) TiO2/CuO photoanode. (b) TiO2/CuO + Dye
and (c) tomato dye.

12. SELECTED RESULTS
• Photoelectrical performance of DSSC
FF =
Jmax Vmax
𝐽𝑠𝑐 𝑉𝑜𝑐
η =
𝐹𝐹×(𝑉𝑜𝑐×𝐽𝑜𝑐)
𝑃𝑖𝑛
Where,
FF= fill factor,
Jsc = short circuit current,
Voc = open circuit voltage,
η = efficiency
J-V plot of sensitizer DSSCs

13. CONCLUSION
• Natural dye sensitized solar cell was fabricated with
tomato extract as dye. The Optical properties of TiO2/CuO
composites and tomato extract were studied.
• The J-V measurements made on our DSSC shows that the
solar cells using tomato as sensitizers have interesting
values of short current (JSC), open circuit voltage (VOC) and
fill factor (FF) are 6.6 mA/cm2, 0.615 V and 0.73
respectively.

14. ACKNOWLEDGMENT
• Dr. J.H. Markna, Prof. Chirag R. Savaliya and
prof. V.R. Rathod for their supervision, guidance,
encouragement and support.
• We are also thankful to GUJCOST Gandhinagar for
the financial support for research work
(GUJCOST/MRP/2015-16/2607).

15. THANK YOU