Development of CdxZn1-xTe alloy thin films for tandem solar cell applications

被引：15

作者：

Dhere, R ^{[1
]}

Gessert, T ^{[1
]}

Zhou, J ^{[1
]}

Pankow, J ^{[1
]}

Asher, S ^{[1
]}

Moutinho, H ^{[1
]}

机构：

[1] Natl Renewable Energy Lab, Golden, CO 80401 USA

来源：

PHYSICA STATUS SOLIDI B-BASIC RESEARCH | 2004年 / 241卷 / 03期

关键词：

D O I：

10.1002/pssb.200304193

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report our development efforts for CdxZn1-xTe alloy thin films for tandem solar cells. We used three aspects of CdTe solar cell fabrication considered key to high performance: high-temperature deposition, post-deposition CdCl2 heat treatment, and use of O-2 ambient during device processing. We used bilayers of CdTe and ZnTe as the basis for the formation of CdxZn1-xTe alloy. Use of oxygen at any stage of the processing proved to be problematic due to the formation of ZnO, which resulted in two-phase mixture of CdTe and ZnO. These results can explain the poor performance of CdxZn1-xTe alloy thin-film solar cells reported by several groups. We carried out oxygen free processing of the bilayer stacks and postdeposition heat treatments. Heat treatment in the presence of CdCl2 vapor resulted in the interaction between ZnTe and CdCl2 and the loss of Zn in the form of ZnCl2. Heat treatments of the stack in He ambient resulted in the interdiffusion of the two layers. The composition profiles of the intermixed alloy region were influenced mainly by temperature and the time of the treatment. It is possible to obtain either uniform or graded alloy profiles by adjusting the two parameters. It is possible to adjust the composition of the resuting alloy by adjusting the thickness ratio of CdTe and ZnTe layers. We discuss suitability of the alloy formation using the CdTe/ZnTe bilayers for the top cell fabrication of two-junction tandem solar cells. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

引用

页码：771 / 774

页数：4

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