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Electron-beam induced degradation in CdTe photovoltaics

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4 Author(s)
Harju, R. ; First Solar LLC, 12900 Eckel Junction Road, Perrysburg, Ohio 43551 ; Karpov, V.G. ; Grecu, D. ; Dorer, G.

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We used electron beam induced current (EBIC) to measure degradation of CdTe photovoltaic cells. We have observed that: (i) the EBIC signal shows a considerable, continuous degradation depending on the electron-beam current, scan area, energy, and sample treatment; (ii) the characteristic degradation time fluctuates between different spots on the same sample; and (iii) grain boundary regions are the most effective collectors of the electron-beam generated charge carriers. Our phenomenological model relates the observed degradation to defects caused by the electron-beam generated electrons and holes. © 2000 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:88 ,  Issue: 4 )