Studies of oxidation behaviors of CdTe in ammoniacal basic electrolytes
Studies of oxidation behaviors of CdTe in ammoniacal basic electrolytes
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DOI：
10.1016/j.electacta.2006.01.042
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发表时间：
2006-06
影响因子：
6.6
通讯作者：
K. Arai;K. Murase;T. Hirato;Y. Awakura
中科院分区：
文献类型：
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作者：
K. Arai;K. Murase;T. Hirato;Y. Awakura
使用电化学 QCM 检查开路条件下浸入沉积浴中时电沉积 CdTe 层的电极电位和质量随时间的变化，以观察溶解氧引起的氧化行为。还通过 SEM、EPMA 和 XRD 测量检查了 CdTe 层的形貌、成分和结晶度。在浸泡的早期阶段，大多数情况下只有CdTe中的Cd原子从闪锌矿型CdTe晶格中溶解出来，保持了平坦光滑的表面形态完好。然后，剩余的Te形成元素Te的晶格并覆盖CdTe层。由于 Cd 原子的洗脱，Te 层呈多孔状，因此电解质可以穿透 Te 层并到达 CdTe 层的表面。因此，Cd物种的优先溶解持续发生，最后，基底上仅保留多孔Te层。 CdTe 的这种溶解支持了 Cd-Te-NH3-H2O 系统电位-pH 图的有效性。
The time variations in the electrode potential and mass of an electrodeposited CdTe layer when immersed in a deposition bath under an open-circuit condition were examined using an electrochemical QCM in order to observe the oxidation behavior due to dissolved oxygen. The morphology, composition, and crystallinity of the CdTe layer were also examined by SEM, EPMA, and XRD measurements. In the early stage of immersion, mostly only Cd atoms in the CdTe were found to dissolve from the zinc blende-type CdTe lattice, keeping the flat and smooth surface morphology intact. Then, the remaining Te formed a lattice of elemental Te and covered the CdTe layer. The electrolyte could penetrate the Te layer and access the CdTe layer's surface because the Te layer was porous due to the elution of Cd atoms. Therefore, the preferential dissolution of Cd species continued to occur, and finally, only the porous Te layer remained on the substrate. This dissolution of CdTe supports the validity of the potential–pH diagram of the Cd–Te–NH3–H2O system.