Photoacoustic spectra of Si wafers at liquid helium temperature

被引：0

作者：

Matsuyama, Hiroyuki ^{[1
]}

Ikari, Tetsuo ^{[1
]}

Yokoyama, Hirosumi ^{[1
]}

Futagami, Koji ^{[1
]}

机构：

[1] Miyazaki Univ, Miyazaki, Japan

来源：

Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes & Review Papers | 1995年 / 34卷 / 5 B期

关键词：

Applications; (APP); -; Experimental; (EXP);

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Photoacoustic (PA) measurements of p- and n-type Si single crystals are carried out at liquid helium temperature (4.2 K). Two small peaks around 1.2 eV are observed in both samples. The energy of the higher-energy peak at 1.21 eV agrees with the thresholds of free exciton absorption with the emission of TO momentum-conserving phonons. The lower-energy peak shifts to the higher energy side with the decrease of the excitation light intensity. The possibility of the formation of an electron-hole drop for the lower energy peak will be discussed to explain the experimental results.

引用

页码：2904 / 2906

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