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Universität Karlsruhe (TH)
1Organic Semiconductors
ϕA + ϕB
ϕA - ϕB π∗, LUMO
π, HOMO
Energies with high density of states can be treated likeenergy bands in inorganic semiconductors
Overlapping orbitals ϕA und ϕB
E
Universität Karlsruhe (TH)
2Polymer solar cells
P3HT:PCBM
PEDOT:PSS
Cathode200 nm
Substrate (Glass)
Absorber200 nm
Hole conduction20 nm
Anode (ITO)125 nm
Universität Karlsruhe (TH)
3Polymer solar cells
-
+
EB = 0,4…1,4 eV
-
Bilayer Heterojunction Bulk Heterojunction
Universität Karlsruhe (TH)
4
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
Universität Karlsruhe (TH)
5Cathode replacement with n-doped layers
[Colsmann et al, SPIE Proc 6192:6192-95 (2006)]
E
BPhen
Li
Universität Karlsruhe (TH)
6Transparent devices
[Source: ZSW, Stuttgart, 2007]
LiF interfaces lead to local n-doping
Universität Karlsruhe (TH)
7Transparent devices
Au/Alη = 0,73%
BPhen:Li / PH750 / Au / Alη = 1,01%
BPhen:Li / PH750η = 0,62%
[Source: Felix Nickel, Project work, LTI, 2007]
Universität Karlsruhe (TH)
9Tandem solar cells
Recombination zone
Metall contacts are opaque
Gold particles between (doped)charge carrier transport layers
Universität Karlsruhe (TH)
13Simulations
Fine adjustment of the optical field by n-doped transport layers
Universität Karlsruhe (TH)
22Infrared absorbing molecules
S
N
S
NS
N
nC12H25
PTPTB
S S
NS
NEHEH
n
PFDTBT
Donor + Acceptor internal charge transfer complexin which the whole polymer
actsin the solar cell as a
electron donorHOMO
HOMO
LUMO
LUMO
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