Abstract
AbstractA solid state electrochemical cell, K1-xFe11O17/potassium beta-alumina/metal gauze, is presented which is capable of producing a beam of potassium vapour. The generation of potassium vapour has been demonstrated and the cell has been used to dope ZnSe during growth of the chalcogenide by molecular beam epitaxy, thus forming p-type ZnSe. The electrochemical source has the advantage that the potassium flux is controlled by the current passing through the cell and eliminates the need to handle potassium metal. Cyclic voltammetric measurements at 350'C suggest that potassium metal is first generated electrochemically by a mechanism of nucleation and growth, then evaporates from the cell.
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