Generation-dependent charge carrier transport in Cu(In,Ga)Se 2/CdS/ZnO thin-film solar-cells
Entidad
UAM. Departamento de Física AplicadaEditor
American Institute of Physics.Fecha de edición
2013-01-28Cita
10.1063/1.4788827
Journal of Applied Physics 113.4 (2013): 044515
ISSN
0021-8979 (print); 1089-7550 (online)DOI
10.1063/1.4788827Versión del editor
http://dx.doi.org/10.1063/1.4788827Materias
Solar cells; II-VI semiconductors; Band models; Conductions bands; Carrier generation; FísicaNota
The following article appeared in Journal of Applied Physics 113.4 (2013): 044515 and may be found at http://scitation.aip.org/content/aip/journal/jap/113/4/10.1063/1.4788827Derechos
© 2013 American Institute of Physics.Resumen
Cross section electron-beam induced current (EBIC) and illumination- dependent current voltage (IV) measurements show that charge carrier transport in Cu(In,Ga)Se2 (CIGSe)/CdS/ZnO solar-cells is generation-dependent. We perform a detailed analysis of CIGSe solar cells with different CdS layer thicknesses and varying Ga-content in the absorber layer. In conjunction with numerical simulations, EBIC and IV data are used to develop a consistent model for charge and defect distributions with a focus on the heterojunction region. The best model to explain our experimental data is based on a p+ layer at the CIGSe/CdS interface leading to generation-dependent transport in EBIC at room temperature. Acceptor-type defect states at the CdS/ZnO interface cause a significant reduction of the photocurrent in the red-light illuminated IV characteristics at low temperatures (red kink effect). Shallow donor-type defect states at the p+ layer/CdS interface of some grains of the absorber layer are responsible for grain specific, i.e., spatially inhomogeneous, charge carrier transport observed in EBIC.
Lista de ficheros
Google Scholar:Nichterwitz, Melanie
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Caballero, Raquel
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Kaufmann, Christian Alexander
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Schock, Hans Werner
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Unold, Thomas
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