Case study of failure analysis in thin film silicon solar cell

被引:2
|
作者
Mello, D. [1 ]
Ricciari, R. [1 ]
Battaglia, A. [2 ]
Foti, M. [1 ]
Gerardi, C. [1 ]
机构
[1] STMicroelectronics, I-95121 Catania, Italy
[2] 3Sun, I-95100 Catana, Italy
关键词
MODULES; LASER;
D O I
10.1016/j.microrel.2015.06.040
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Thin-film silicon modules are commonly produced by an alternating sequence of layer deposition and layer patterning steps, which lead to a monolithic series connected device. Most used process is laser scribing process that offers a high throughput and a small area loss. Tin oxide (SnO2) or zinc oxide (ZnO) are the most used front contact TCO in the superstrate configuration. ZnO presents better optical properties with respect to SnO2 and can be realized by low thermal and cost effective deposition processes. Electrical performance of our tandem thin film silicon cell deposited on ZnO front contact has shown higher shunt with respect with our reference process using SnO2 front contact, not explained only as difference between the two materials. In this work, a failure analysis process was followed in order to explain the origin of the difference. SEM, FIB and Auger electron spectroscopy were used in order to characterize the laser scribe that is known to be a possible cause of electrical deviation. We found residuals either on the bottom either on the later wall of P3 scribe that can explain the lowering shunt resistance and open circuit voltage observed into the electrical performances of the module. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1800 / 1803
页数:4
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