bsc thesis jochen wolf
TRANSCRIPT
Technische Universität München
Realizing flexibility and artificial structures for organic solar cells
Advisor: Claudia M. Palumbiny
Supervisor: Peter Müller-Buschbaum
Technische Universität München, Physik-Department,
Lehrstuhl für Funktionelle Materialien, James-Franck-Str.1, 85748 Garching
Bachelor Thesis by Jochen Wolf
Technische Universität München
05/08/2013 Jochen Wolf 2
0. Outline
1.1 Motivation
1.2 Working principle of organic solar cells
1.3 Device architectures
1.4 Sample preparation
2.1 Current-voltage measurements
2.2 UV\Vis measurements
2.3 Scanning electron microscope
3. Structuring on PET
4. Conclusion and acknowledgements
Technische Universität München
05/08/2013 Jochen Wolf 3
1.1 Motivation
plusplasticelectronics.com
konarka.com
popsci.com
- transparent
- potentially cheap production
- flexible & light
after globalwarmingart.com
Sun spectrum
Technische Universität München
05/08/2013 Jochen Wolf 4
1.2 Working principle of organic solar cells
Equivalent circuit of solar cells
V
P3HT PCBM
Palumbiny MSc thesis
Meier MSc thesis Meier MSc thesis
Technische Universität München
05/08/2013 Jochen Wolf 5
1.3 Device architectures
archite
cture A architecture B
substrates:glass and PET
archite
cture C architecture D
Aluminium
Active Layer
PEDOT:PSS
ITO
substrate
Highly conductive PEDOT:PSS
Technische Universität München
05/08/2013 Jochen Wolf 6
1.4 Sample preparation
Meier MSc thesis
Technische Universität München
05/08/2013 Jochen Wolf 7
2.1 Current-voltage measurements
𝜂=𝑉 𝑀𝑃𝑃 𝐼𝑀𝑃𝑃
𝐴𝑃 𝑖𝑛
Efficiency
𝑉𝑀𝑃𝑃
𝐼𝑆𝐶
𝑉 𝑂𝐶
𝐼𝑀𝑃𝑃𝑀𝑃𝑃
ITO-freeContains ITO
Technische Universität München
05/08/2013 Jochen Wolf 9
2.2 UV\Vis measurements
Transmittance Reflectance
After DOI: 10.5772/52741
Perkin Elmer Perkin Elmer
Technische Universität München
05/08/2013 Jochen Wolf 10
2.2 UV\Vis measurements
Col
our
Dev
ice
arch
itect
ure
Ele
ctro
de
Ele
trcon
blo
ckin
g la
yer
Act
ive
laye
r
── A ITO PEDOT:PSS ── A ITO PEDOT:PSS P3HT:PCBM ── B ITO H-PEDOT:PSS ── B ITO H-PEDOT:PSS P3HT:PCBM ── C H-PEDOT:PSS ── C H-PEDOT:PSS P3HT:PCBM ── D H-PEDOT:PSS PEDOT:PSS ── D H-PEDOT:PSS PEDOT:PSS P3HT:PCBM
glass substrate PET substrate
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abso
rptio
n [%
]
wavelength [nm]
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abso
rptio
n [%
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wavelength [nm]
with active layer
without active layer
with active layer
without active layer
Technische Universität München
05/08/2013 Jochen Wolf 11
2.3 Scanning electron microscope
H-PEDOT:PSS spin coated on PET H-PEDOT:PSS spin coated on glass
Edge of PET foil ITO-PET foil
Technische Universität München
Lang Bachelor thesis
05/08/2013 Jochen Wolf 12
3. Structuring on PET
Imprint of a CD structure in PEDOT:PSS on PET
PET substrate
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0
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abso
rptio
n [%
]
wavelength [nm]
with active layer
without active layer
Technische Universität München
05/08/2013 Jochen Wolf 13
3. Structuring on PET
Lang Bachelor thesis
Lang Bachelor thesis
Technische Universität München
05/08/2013 Jochen Wolf 14
4. Conclusion and acknowledgements
I would like to express my thanks the following people:
My supervisor: Peter Müller-Buschbaum
My advisor: Claudia M. Palumbiny
And all the rest of the E13 staff that made this thesis a great experience!
300 400 500 600 700 8000
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abso
rptio
n [%
]
wavelength [nm]
- ITO-free organic solar cells feasible
- Layer thicknesses similar on PET and glass
- Need for a new supplier of PET
- Structured PEDOT:PSS on PET possible
Technische Universität München
Technische Universität München
05/08/2013 Jochen Wolf 16
Worldwide radiation average
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Solar cycle and maximum efficiency
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05/08/2013 Jochen Wolf 18
Efficiencies
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Layers of the ITO-PET foil
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molecular orbitals
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Molecular structures
PEDOT PSS P3HTPCBM
PDMS
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atomic force microscope (AFM)
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solar simulator
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05/08/2013 Jochen Wolf 24
H-PEDOT:PSS on PET
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05/08/2013 Jochen Wolf 25
PET transmittance and reflectance
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05/08/2013 Jochen Wolf 26
PET reflectance and transmittance
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05/08/2013 Jochen Wolf 27
Transmittance to active layer
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05/08/2013 Jochen Wolf 28
Current-voltage measurement on glass
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05/08/2013 Jochen Wolf 29
Current-voltage measurement on glass
Technische Universität München
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PDMS stamp
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Solar cell
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Flextrode
http://www.plasticphotovoltaics.org/flextrode.html
Flextrode by DTU
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05/08/2013 Jochen Wolf 33
structuring
black silicon
PDMS stamp
PEDOT:PSS