References of "Babbe, Finn 50008601"
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See detailPost-deposition treatment of Cu2ZnSnSe4 with alkalis
Rey, Germain UL; Babbe, Finn UL; Weiss, Thomas UL et al

in Thin Solid Films (2016), 633

Low temperature post-deposition treatment of Cu2ZnSnSe4 with NaF and KF significantly improved the solar cell efficiency (from 6.4% to 7.8% and 7.7% on average, respectively) due to enhanced fill factor ... [more ▼]

Low temperature post-deposition treatment of Cu2ZnSnSe4 with NaF and KF significantly improved the solar cell efficiency (from 6.4% to 7.8% and 7.7% on average, respectively) due to enhanced fill factor (from 0.58 to 0.61 and 0.62), open-circuit voltage (Voc) (from 314 mV to 337 mV and 325 mV) and short-circuit current density (from 35.3 mA⋅cm −2 to 38.3 mA⋅cm −2 and 38.6 mA⋅cm −2). Voc improvement was higher for solar cells with NaF treatment due to an increase in radiative efficiency at room temperature and shallower defect activation energy as determined by photoluminescence (PL) and temperature dependent admittance spectroscopy, respectively. In the case of KF treatment, red-shift of the PL, higher band tail density of state and donor activation energy deeper in the band gap were limiting further improvement of the Voc compared to NaF treatment. [less ▲]

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See detailQuasi Fermi level splitting of Cu-rich and Cu-poor Cu(In,Ga)Se2 absorber layers
Babbe, Finn UL; Choubrac, Léo UL; Siebentritt, Susanne UL

in Applied Physics Letters (2016), 109

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See detailVisualizing the performance loss of solar cells by IR thermography — an evaluation study on CIGS with artificially induced defects
Vetter, Andreas; Babbe, Finn UL; Hofbeck, Bernhard et al

in Progress in Photovoltaics (2016), 24(7), 1001-1008

Local electric defects may result in considerable performance losses in solar cells. Infrared (IR) thermography is one im- portant tool to detect these defects on photovoltaic modules. Qualitative ... [more ▼]

Local electric defects may result in considerable performance losses in solar cells. Infrared (IR) thermography is one im- portant tool to detect these defects on photovoltaic modules. Qualitative interpretation of IR images has been carried out successfully, but quantitative interpretation has been hampered by the lack of “calibration” defects. The aims of this study are to (i) establish methods to induce well-defined electric defects in thin-film solar cells serving as “calibration” defects and to (ii) assess the accuracy of IR imaging methods by using these artificially induced defects. This approach paves the way for improving quality control methods based on imaging in photovoltaic. We created ohmic defects (“shunts”) by using a focused ion beam and weak diodes (“interface shunts”) by applying a femto-second laser at rather low power on copper indium gallium selenide cells. The defects can be induced precisely and reproducibly, and the severity of the defects on the electrical performance can be well adjusted by focused ion beam/laser parameters. The successive assess- ment of the IR measurement (ILIT-Voc) revealed that this method can predict the losses in Pmpp (maximal power extract- able) with a mean error of below 10%. [less ▲]

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See detailStudy on the quasi Fermi level splitting of Cu(In,Ga)Se2 absorber layers with Cu-rich and Cu-poor composition
Babbe, Finn UL; Choubrac, Léo UL; Siebentritt, Susanne UL

in IEEE Photovoltaic Specialists Conference. Conference Record (2016)

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