Indications of short minority-carrier lifetime in kesterite solar cells
2013; American Institute of Physics; Volume: 114; Issue: 8 Linguagem: Inglês
10.1063/1.4819849
ISSN1520-8850
AutoresIngrid Repins, Helio Moutinho, Sukgeun Choi, Ana Kanevce, Darius Kuciauskas, P. Dippo, Carolyn Beall, J. J. Carapella, Clay DeHart, Bo Huang, Su‐Huai Wei,
Tópico(s)Copper-based nanomaterials and applications
ResumoSolar cells based on kesterite absorbers consistently show lower voltages than those based on chalcopyrites with the same bandgap. We use three different experimental methods and associated data analysis to determine minority-carrier lifetime in a 9.4%-efficient Cu2ZnSnSe4 device. The methods are cross-sectional electron-beam induced current, quantum efficiency, and time-resolved photoluminescence. These methods independently indicate minority-carrier lifetimes of a few nanoseconds. A comparison of current-voltage measurements and device modeling suggests that these short minority-carrier lifetimes cause a significant limitation on the voltage produced by the device. The comparison also implies that low minority-carrier lifetime alone does not account for all voltage loss in these devices.
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