Recycling ZnTe, CdTe, and Other Compound Semiconductors by Ambipolar Electrolysis
- 28 October 2011
- journal article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 133 (49), 19971-19975
- https://doi.org/10.1021/ja208577j
Abstract
The electrochemical behavior of ZnTe and CdTe compound semiconductors dissolved in molten ZnCl2 and equimolar CdCl2–KCl, respectively, was examined. In these melts dissolved Te is present as the divalent telluride anion, Te2–, which was found able to be converted to elemental metal by electrochemical oxidation at the anode. ZnTe–ZnCl2 melts were studied at 500 °C by standard electrochemical techniques. On the basis of these results, electrolysis was performed, resulting in the simultaneous extraction of phase-pure liquid Zn at the cathode and phase-pure liquid Te at the anode. This new process, involving the simultaneous deposition of liquid metals at electrodes of opposite polarity, is termed herein as ambipolar electrolysis. A melt consisting of CdTe dissolved in equimolar CdCl2–KCl was processed by ambipolar electrolysis, resulting in the production of liquid Cd at the cathode and liquid Te at the anode. Ambipolar electrolysis could enable new approaches to recycling compound semiconductors and semiconductor devices, such as CdTe solar cells.Keywords
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