Boron-doped silicon film as a recombination layer in the tunnel junction of a tandem solar cell

• Published in: Journal of semiconductors 2009-06, Vol.30 (6), p.25-28
• Main Author: 石明吉 王占国 刘石勇 彭文博 肖海波 张长沙 曾湘波
• Format: Article
• Language: English
• Subjects: 串联; 原子力显微镜; 太阳能电池; 掺硼; 硅薄膜; 等离子体增强化学气相沉积; 重组; 隧道结
• ISSN: 1674-4926
• DOI: 10.1088/1674-4926/30/6/063001

Boron-doped hydrogenated silicon films with different gaseous doping ratios（B2H6/SiH4） were deposited in a plasma-enhanced chemical vapor deposition（PECVD） system.The microstructure of the films was investigated by atomic force microscopy（AFM） and Raman scattering spectroscopy.The electrical properties of the films were characterized by their room temperature electrical conductivity（σ） and the activation energy（Ea）.The results show that with an increasing gaseous doping ratio,the silicon films transfer from a microcrystalline to an amorphous phase,and corresponding changes in the electrical properties were observed.The thin boron-doped silicon layers were fabricated as recombination layers in tunnel junctions.The measurements of the I-V characteristics and the transparency spectra of the junctions indicate that the best gaseous doping ratio of the recombination layer is 0.04,and the film deposited under that condition is amorphous silicon with a small amount of crystallites embedded in it.The junction with such a recombination layer has a small resistance,a nearly ohmic contact,and a negligible optical absorption.