Comparison of Microstructures of CdTe Layers Electrodeposited from Basic Ammoniacal and Acidic Sulfate Electrolytes
Comparison of Microstructures of CdTe Layers Electrodeposited from Basic Ammoniacal and Acidic Sulfate Electrolytes
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DOI：
10.1149/1.1643739
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发表时间：
2004-03
影响因子：
3.9
通讯作者：
M. Miyake;H. Inui;K. Murase;T. Hirato;Y. Awakura
中科院分区：
文献类型：
--
作者：
M. Miyake;H. Inui;K. Murase;T. Hirato;Y. Awakura
通过透射电子显微镜研究了碱性氨电解质电沉积的 CdTe 层的微观结构，并与传统酸性硫酸盐电解质的微观结构进行了比较。沉积态 CdTe 层具有接近化学计量的成分，来自具有相对较高 Cd(II)/Te(IV) 浓度比的碱性电解质，由随机取向的晶粒组成，晶粒尺寸约为 100 nm。 10 nm，而来自酸性电解质的那些由具有优先生长方向的有缺陷的柱状晶组成。发现来自具有相对低的 Cd(II)/Te(IV) 浓度比的碱性电解质的含有约 65 原子% Te 的沉积物是非晶态的，通过电子束照射很容易结晶成 CdTe、元素 Te 和痕量 Te 2 O 5 的混合物。通过在 Ar 气氛中在 300°C 下退火 1 小时，来自碱性电解质的 CdTe 晶粒生长了约四倍，但同时在晶界处形成了纳米空隙。相反，在相同条件下退火时，酸性电解质中的 CdTe 晶粒不会生长。
The microstructures of CdTe layers electrodeposited from basic ammoniacal electrolytes were investigated by transmission electron microscopy and compared with those from a conventional acidic sulfate electrolyte. As-deposited CdTe layers with a nearly stoichiometric composition from a basic electrolyte with a relatively high Cd(II)/Te(IV) concentration ratio were composed of randomly oriented crystallites with a grain size of ca. 10 nm, while those from an acidic electrolyte consisted of defective columnar grains with a preferred growth orientation. Deposit containing around 65 atom % Te from a basic electrolyte with a relatively low Cd(II)/Te(IV) concentration ratio was found to be amorphous, which was easily crystallized into a mixture of CdTe, elemental Te, and a trace amount of Te 2 O 5 by electron beam illumination. By annealing at 300°C for I h in an Ar atmosphere, CdTe grains from the basic electrolyte grew by about a factor of four, but at the same time, nano-voids were formed at the grain boundaries. In contrast, CdTe grains from the acidic electrolyte did not grow by annealing under the same conditions.