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1 Stable Next-Generation Photovoltaics: Unravelling Degradation Mechanisms of Organic Solar Cells by Complementary Characterization Techniques StableNextSol MP STABILITY AND DEGRADATION STUDIES OF ORGANIC AND HYBRID PV DEVICES BY MEANS OF CONCENTRATED SUNLIGHT- STSM Ref No: Laura Ciammaruchi, Iris Visoly-Fisher (BGU), Francesca Brunetti (UTV) 3 rd MC Meeting, 2 nd WG Meeting, 2 nd Conference E-MRS Symposium E-MRS. Lile, Fr. May 11 th - 12 th, 2015 COST is supported by the EU RTD Framework Programe ESF provides the COST Office through a European Commission contract

2 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).

3 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

4 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] shelf-life air glove-box

5 Current Density (ma/cm2) Current Density (ma/cm2) Chlorobenzene O-Xylene 20 Cholorbenzene_fresh device 100 h shelf-life 240 h shelf-life 400 h shelf-life 1080 h shelf-life 20 o-xylene_fresh device 100 h shelf-life 240 h shelf-life 400 h shelf-life 1080 h shelf-life Volt (V) Volt (V) J-V curve evolution over time for devices realized with different solvents

6 FF_norm Eff_norm Voc_norm Jsc_norm Cholobenzene (non-encaps) Chlorobenzene (non-encaps) Chlorobenzene (non-encaps) Chlorobenzene (non-encaps)

7 FF_norm Eff_norm Voc_norm Jsc_norm Cholobenzene (non-encaps) Chlorobenzene (non-encaps) Chlorobenzene (non-encaps) Chlorobenzene (non-encaps)

8 Abs. (a.u.) Abs (a.u.) RESULTS - (1) 0.5 Chlorobenzene O-Xylene PTB7:PCBM_fresh PTB7:PCBM_+400h shelf-life PTB7:PCBM_fresh PTB7:PCBM_+400h shelf-life Wavelength (nm) Wavelength (nm)

9 CB-blended PAL_fresh AFM phase O-Xy blended PAL_fresh After 400h shelf life After 400h shelf life

10 normalized loss of absorbed photons Difference spectra PTB7:PCBM in Chlorobenzene_400h shelf life PTB7:PCBM in o-xylene_400h shelf life wavelength (nm)

11 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

12 FUTURE WORK BGU: accelerated stress tests under varying T and photon dose of encapsulated devices/ films. parallel outdoor degradation studies, to test devices at different latitudes and radiation intensities.

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