Near infrared laser CdCl2 heat treatment for CDTE solar cells
conference contribution
posted on 2016-11-04, 10:07authored byVasilios Palekis, Shamara Collins, Md Imran Khan, Vamsi Evani, Sudhajit Misra, Michael A. Scarpulla, Ali AbbasAli Abbas, Michael WallsMichael Walls, Chris Ferekides
The CdCl2 heat treatment (HT) is one of the most critical steps in the fabrication of high efficiency CdTe solar cells. In this study a laser based CdCl2 treatment is presented. A high power near infrared 808 nm) diode laser was used for laser
annealing (LA) CdTe cells. The effect of laser power density (LPD)and annealing time on the devices was
studied using photoluminescence PL), current voltage and spectral response measurements. PL spectra exhibited a correlation between the LPD and the defect density in CdTe. CdS thinning and narrowing
of the CdTe bandgap was observed with increasing LPD and longer anneal times. All solar cell parameters,
open-circuit voltage (VOC), short-circuit current (JSC), and fill-factor (FF), improved as a result of the laser annealing compared to as-deposited cells. The LPD was optimized with best cell parameters
obtained to-date being: VOC=800mV, JSC= 23.34 mA/cm2, and FF=71%.
Funding
This work was supported in full by the Department of Energy through the Bay Area Photovoltaic Consortium under
award DE-EE0004946
History
School
Mechanical, Electrical and Manufacturing Engineering
PALEKIS, V. ...et al., 2016. Near infrared laser CdCl2 heat treatment for CDTE solar cells. Presented at the 43rd IEEE Photovoltaics Specialist Conference, Portland, OR, 5-10th June, pp. 1498-1502.
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