2. Outline:
Importance of Perovskite material (CH3NH3PbI3)
Working of Perovskite Solar Cell
Work Executed
Inferences
Future Plan
2
Perovskite Structure
Eg: BaTiO3 , CH3NH3PbI3
3. Importance of Perovskite material
Advantages:
Direct optical band gap of around 1.5 eV
Long diffusion length
Long minority carrier lifetimes
Broad absorption range from visible to near-infrared spectrum (800 nm)
Disadvantage:
Degradation of Methyl Ammonium Lead Iodide Perovskite
3
4. Working of Perovskite Solar Cell:
4
Electron Transport Layer Zinc Oxide (50-300nm)
Absorber Layer CH3NH3PbI3 (300nm)
Hole Transport Layer Copper Iodide (250nm)
Metal Electrode Gold
Possible Absorber Layers : CH3NH3PbCl3 ,
CH3NH3SnI3, CH3H3PbBr3 etc
5. WORK EXECUTED
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Preparation of thin films:
Perovskite thin film by thermal evaporation (Band Gap = 1.5eV)
Zinc Oxide by spin coating (Band Gap = 3.3 eV)
Copper Iodide by thermal evaporation ( Band Gap = 3.0eV)
Characterization of thin films:
X ray Diffraction
UV-Visible spectroscopy
Perovskite Topography by SEM (Quanta 200)
6. Preparation of Perovskite film
6
Fig. Dual source evaporation using Pb𝐼2and MAI
Tze-Bin Song, etal(2015)…RSC.10.1039/c4ta05246c
Base Vacuum ≈5.3E-5 mbar
Case I: One Step Process
Both the sources are heated simultaneously
Case II: Two Step Process
First one source is heated to full deposition of the film
First is cooled, Second is heated.
9. SEM images of perovskite thin film
9
SEM image of perovskite taken at 0 days SEM image of perovskite taken after 2days
10. Working of Perovskite Solar Cell:
10
Electron Transport Layer Zinc Oxide (50-300nm)
Absorber Layer CH3NH3PbI3 (300nm)
Hole Transport Layer Copper Iodide (250nm)
Metal Electrode Gold
Possible Absorber Layers : CH3NH3PbCl3 ,
CH3NH3SnI3, CH3H3PbBr3 etc
13. Inferences:
Synthesis of MAI by chemical process was achieved successfully.
Perovskite material and CuI thin films were optimised to a required
thickness of around 300nm and 200nm respectively.
Band gap of Perovskite material (CH3NH3PbI3) and CuI were verified
using UV visible spectroscopy.
Degradation affected the surface morphology of the perovskite material
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14. Future work
Optical characterization of ZnO
Raman Studies of Absorber Layer
Fabrication of Perovskite Solar Cell
Current Voltage characteristics of the Device
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