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Near infrared laser CdCl2 heat treatment for CDTE solar cells

conference contribution
posted on 04.11.2016 by Vasilios Palekis, Shamara Collins, Md Imran Khan, Vamsi Evani, Sudhajit Misra, Michael A. Scarpulla, Ali Abbas, Michael 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

Published in

43rd IEEE Photovoltaics Specialist Conference (PVSC)

Pages

1498 - 1502 (5)

Citation

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.

Publisher

© IEEE

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

10/10/2016

Publication date

2016

Notes

This paper is in closed access.

ISBN

9781509027248

Language

en

Location

Portland, OR

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