preliminary schedule - kit
TRANSCRIPT
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Universität Karlsruhe (TH)
1
Preliminary schedule
1. Introduction, The Sun2. Semiconductor fundamentals3. Solar cell working principles / pn-junction solar cell4. Silicon solar cells5. Copper-Indiumdiselenide solar cells6. Cell optimization and highly efficient device concepts7. Modules and system integration8. Organic photovoltaics9. Dye sensitized solar cells
10. Economics and profitability11. Other renewable energies12. Excursion
Course schedule
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2Dye sensitized solar cells
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3Background
Dr. Michael Grätzel
1991: Dr. Michael Grätzel created the„Grätzel Cell“ (dye sensitized
solar cell – DSSC) at EPFL
Promising technology:low costeasy manufacturingpower conversion efficiency of
10%
Companies:Dyesol (Queanbeyan, Australia)G24i (Wentloog, Cardiff)
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4Companies
G24i: licensed EPFL technology
Dyesol: selling materials (dyes, electrolytes,…) and equipment (screen printer, dye
applicator, electrolytefilling machine,…)
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5Schematic structure
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6Schematic structure
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7TiO2 photoelectrode
TiO2 film SEM photograph
TiO2 collodial solution (or paste) sintered at 450 – 500°C
Film thickness typ. 10 µm
Roughness factor > 1000 gives large actual surface
Porosity of 50-70% needed forsufficient electrolyte film penetration
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8Ru complex photosensitizer
Typical Ru complexsensitziers developed byGrätzel‘s group
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9Ru complex photosensitizer
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10Ru complex photosensitizer
N3 dye adsorbed on the (101) surface of TiO2
Ru complexes with carboxylgroups to anchor the TiO2surface
Coverage of the TiO2surface with N3 dye near100%
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11Redox electrolyte
Electrolyte contains I-/I3- redox ions for electron mediation
between the TiO2 photoelectrode and the counter electrode
Cell performance depends on:- counter cations of iodides (e.g. Li+, Na+, K+)- viscosity of solvents
DyeRedox
ElectrolyteTiO2
I- I3-
Cathode
e-
e-
e-
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12Counter electrode
DyeRedox
ElectrolyteTiO2
I- I3-
Cathode
e-
e-
e-
I3- ions are re-reduced to I- ions at the counter electrode
Pt coated on TCO (approx. 200 nm) or carbon are typically used
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13Sealing materials
Prevent leakage of the electrolyte and the evaporation of thesolvent
Chemical and photochemical stability against the electrolytecomponent, iodine and the solvent is required
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14Primary processes
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15Photovoltaic performance
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16Photovoltaic performance
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17Charge-transfer kinetics
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18Dark current
Recombination of injected electrons with I3- ions: −−− →+ ITiOeI 3)(2 23
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19Electron transport in TiO2 film
Very small electron conductivity in TiO2 film
Conductivity in DSSC significantly increased due to electroninjection from the photosensitizers under photon irradiation
Conductivity and photocurrent response increase with increasinglight intensity
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20Characteristics
High energy conversion efficiency
Low-cost fabrication
Abundant supply of component
materials
Good potential for colorful,
adaptable consumer products
Low potential for environmental
pollution
Good recycability
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21DSSC Fabrication
Preparation of TiO2 colloid
Preparation of the TiO2 electrode
Dye fixation onto the TiO2 film
Redox electrolyte
Counter electrode
Assembling the cell
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22DSSC Fabrication
Preparation of TiO2 colloid
Preparation of the TiO2 electrodea) Doctor bladingb) Screen printing
Dye fixation onto the TiO2 film
Redox electrolyte
Counter electrode
Assembling the cell
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23DSSC Fabrication
Preparation of TiO2 colloid
Preparation of the TiO2 electrodea) Doctor bladingb) Screen printing
Dye fixation onto the TiO2 film
Redox electrolyte
Counter electrode
Assembling the cell
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24DSSC Fabrication
Preparation of TiO2 colloid
Preparation of the TiO2 electrodea) Doctor bladingb) Screen printing
Dye fixation onto the TiO2 film
Redox electrolyte
Counter electrode
Assembling the cell
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25DSSC Fabrication
Preparation of TiO2 colloid
Preparation of the TiO2 electrodea) Doctor bladingb) Screen printing
Dye fixation onto the TiO2 film
Redox electrolyte
Counter electrode
Assembling the cell
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26DSSC Fabrication
Preparation of TiO2 colloid
Preparation of the TiO2 electrodea) Doctor bladingb) Screen printing
Dye fixation onto the TiO2 film
Redox electrolyte
Counter electrode
Assembling the cell
Sputtering process
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27DSSC Fabrication
Preparation of TiO2 colloid
Preparation of the TiO2 electrodea) Doctor bladingb) Screen printing
Dye fixation onto the TiO2 film
Redox electrolyte
Counter electrode
Assembling the cell
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28Cell Performance
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29New oxide semiconductor film photoelectrodes
Replace TiO2 by: ZnO η = 2.5%SnO2 η = 0.65%Nb2O5 η = 2.6%In2O3 η = 0.38%SrTiO3η = 1.8%
Combine two oxide semiconducter materialsTennakone et al. SnO2/ZnO η = 8%
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30New dye photosensitizers
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31Organic and natural dye photosensitizers
variety of structures for molecular design
cheaper than metal complexes
large absorption coefficients
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32New electrolyte
Replace volatile organic solvents by
room-temperature ionic liquids (molten salts)
high ion conductivity
electrochemical stabitiy
nonvolatility
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33Solid state DSSCs
1, conducting F-doped SnO2-coated glass2, compact TiO2 layer3, dye-sensitized heterojunction4, gold electrode
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34Quasi solid state DSSCs
Gelator used to replace liquid electrolyte
Gelator added to the electrolyteat elevated temperature
Hot electrolyte solution appicatedon dye-coated TiO2 layer
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35Prospects
Improvement of efficiency
Long-term stability for outdoor applications
Solid electrolyte
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36Prospects