Stable Next-Generation Photovoltaics: Unravelling Degradation Mechanisms of
Organic Solar Cells by Complementary Characterization Techniques
StableNextSol – MP1307
- STABILITY AND DEGRADATION STUDIES OF ORGANIC
AND HYBRID PV DEVICES BY MEANS OF
CONCENTRATED SUNLIGHTSTSM Ref No:
Laura Ciammaruchi, Iris Visoly-Fisher (BGU), Francesca Brunetti
(UTV)
3rd MC Meeting, 2nd WG Meeting, 2nd Conference E-MRS Symposium E @ E-MRS.
Lile, Fr. May 11th- 12th, 2015
COST is supported by the
EU RTD Framework
Programe
ESF provides the COST
Office through a European
Commission contract
STABILITY AND DEGRADATION STUDIES OF ORGANIC AND HYBRID PV DEVICES BY MEANS OF CONCENTRATED SUNLIGHT
HOST LAB: Center for Hybrid and Organic Solar Energy (CHOSE),
University of Rome Tor Vergata (UTV), Italy
GUEST LAB: Dept. of Solar Energy and Environmental Physics, Jacob
Blaustein Institutes for Desert Research, Ben-Gurion University of the
Negev (BGU), Israel
ESR NAME: Laura Ciammaruchi - Duration: 30 days
Objectives:
(1) Fabricate OPV cells with PTB7:PCBM active layer, blended in
chlorinated and non-chlorinated solvents (@UTV), to study shelf-life
and accelerated degradation with concentrated sunlight (@BGU).
(2) Learning basic perovskite syntesis processes (@UTV), in order to
establish a fabrication station, and study the stability as a function of
the halogen content in the perovskite material (@BGU).
STABILITY AND DEGRADATION STUDIES OF ORGANIC AND HYBRID PV DEVICES BY MEANS OF CONCENTRATED SUNLIGHT
8.7% Power conversion efficiency polymer solar cell realized with
non-chlorinated solvents
G. Susanna et al, Sol. Ener. Mat. Sol. Cells, Vol.134, 2015, p. 194-198
STABILITY AND DEGRADATION STUDIES OF ORGANIC AND HYBRID PV DEVICES BY MEANS OF CONCENTRATED SUNLIGHT
• Project 1 - Experiments performed
- Fabricated two batches of [ITO/PEIE/PTB7:[70]PCBM/MoO3/Ag]
cells, using Chlorobenzene and o-Xylene as solvents.
- Monitored shelf-life of non-encapsulated devices in glove-box/air.
Measurements performed for 1080 hours.
OPV fabrication
[solvent #1/#2]
air
shelf-life
glove-box
STABILITY AND DEGRADATION STUDIES OF ORGANIC AND HYBRID PV DEVICES BY MEANS OF CONCENTRATED SUNLIGHT
O-Xylene
0
Cholorbenzene_fresh device
100 h shelf-life
240 h shelf-life
400 h shelf-life
1080 h shelf-life
0
-20
-1.0
20
Current Density (mA/cm2)
20
Current Density (mA/cm2)
Chlorobenzene
o-Xylene_fresh device
100 h shelf-life
240 h shelf-life
400 h shelf-life
1080 h shelf-life
-20
-0.5
0.0
Volt (V)
0.5
1.0
-1.0
-0.5
0.0
0.5
1.0
Volt (V)
J-V curve evolution over time for devices realized with different solvents
STABILITY AND DEGRADATION STUDIES OF ORGANIC AND HYBRID PV DEVICES BY MEANS OF CONCENTRATED SUNLIGHT
0.8
0.8
0.6
control (glove-box storage)
Cholobenzene (non-encaps)
o-Xylene (non-encaps)
0.6
0.4
0.4
0.2
0.2
control (glove-box storage)
Chlorobenzene (non-encaps)
o-Xylene (non-encaps)
Jsc_norm
1.0
Voc_norm
1.0
hrs (shelf life)
hrs (shelf life)
0.0
0
200
400
600
800
1000
0
1.0
0.8
0.8
0.6
FF_norm
1.0
control (glove-box storage)
Chlorobenzene (non-encaps)
o-Xylene (non-encaps)
0.4
200
Eff_norm
0.0
0.6
400
600
800
1000
control (glove-box storage)
Chlorobenzene (non-encaps)
o-Xylene (non-encaps)
0.4
0.2
0.2
hrs (shelf life)
hrs (shelf life)
0.0
0
200
400
600
0.0
800
1000
0
200
400
600
800
1000
STABILITY AND DEGRADATION STUDIES OF ORGANIC AND HYBRID PV DEVICES BY MEANS OF CONCENTRATED SUNLIGHT
0.8
0.8
0.6
control (glove-box storage)
Cholobenzene (non-encaps)
o-Xylene (non-encaps)
0.6
0.4
0.4
0.2
0.2
control (glove-box storage)
Chlorobenzene (non-encaps)
o-Xylene (non-encaps)
Jsc_norm
1.0
Voc_norm
1.0
hrs (shelf life)
hrs (shelf life)
0.0
0
200
400
600
800
1000
0
1.0
0.8
0.8
0.6
FF_norm
1.0
control (glove-box storage)
Chlorobenzene (non-encaps)
o-Xylene (non-encaps)
0.4
200
Eff_norm
0.0
0.6
400
600
800
1000
control (glove-box storage)
Chlorobenzene (non-encaps)
o-Xylene (non-encaps)
0.4
0.2
0.2
hrs (shelf life)
hrs (shelf life)
0.0
0
200
400
600
0.0
800
1000
0
200
400
600
800
1000
STABILITY AND DEGRADATION STUDIES OF ORGANIC AND HYBRID PV DEVICES BY MEANS OF CONCENTRATED SUNLIGHT
RESULTS - (1)
Chlorobenzene
0.3
0.3
PTB7:PCBM_fresh
PTB7:PCBM_+400h shelf-life
0.2
O-Xylene
Abs. (a.u.)
0.4
0.4
Abs (a.u.)
0.5
PTB7:PCBM_fresh
PTB7:PCBM_+400h shelf-life
0.2
0.1
0.1
400
500
600
Wavelength (nm)
700
400
500
600
700
Wavelength (nm)
STABILITY AND DEGRADATION STUDIES OF ORGANIC AND HYBRID PV DEVICES BY MEANS OF CONCENTRATED SUNLIGHT
AFM phase
CB-blended PAL_fresh
O-Xy blended PAL_fresh
After 400h shelf life
After 400h shelf life
STABILITY AND DEGRADATION STUDIES OF ORGANIC AND HYBRID PV DEVICES BY MEANS OF CONCENTRATED SUNLIGHT
normalized loss of absorbed photons
Difference spectra
1.02
1.01
PTB7:PCBM in Chlorobenzene_400h shelf life
PTB7:PCBM in o-Xylene_400h shelf life
1.00
0.99
0.98
0.97
0.96
0.95
0.94
300
400
500
600
700
wavelength (nm)
STABILITY AND DEGRADATION STUDIES OF ORGANIC AND HYBRID PV DEVICES BY MEANS OF CONCENTRATED SUNLIGHT
• CONCLUSIONS
- Successful and effective collaboration established
between the two partner institutions.
Complementary fabrication/characterization tools
shared and employed
- O-xylene – blended films/cells show comparable/
better shelf-life stability compared to
chlorobenzene-blended films/cells.
>>Poster presented at HOPV 2015 Conference
STABILITY AND DEGRADATION STUDIES OF ORGANIC AND HYBRID PV DEVICES BY MEANS OF CONCENTRATED SUNLIGHT
• FUTURE WORK
- @ BGU: accelerated stress tests under varying T and photon dose
of encapsulated devices/ films.
- @UTV: parallel outdoor degradation studies, to test devices at
different latitudes and radiation intensities.
STABILITY AND DEGRADATION STUDIES OF ORGANIC AND HYBRID PV DEVICES BY MEANS OF CONCENTRATED SUNLIGHT