Photoacoustic Spectra for Porous Silicon Using Piezoelectric Transducer and Microphone
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概要
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Photoacoustic (PA) spectra are measured for porous Si (PS) using piezoelectric detectors (PPT) and compared with the microphone PA (MPA) spectra to examine the nonradiative properties of PS that has complicated nanostructures. Three peaks (peaks 1 and 2, and a small peak at 600 nm) are observed in samples 2 and 3 with porosities $p=60$ and 70%, respectively, while only a single peak (peak 1) is observed in sample 1 with $p=30$%. Peak 2 is related to the band gap of the Si substrate. In contrast, peak 1 seems to be due to the absorption change at the band gap unique to the PS@. This band gap shifts to higher energy for PS samples with higher porosity. We propose that this band gap is defined by the largest size nanocrystals, where PS has nanocrystallite size distribution. The small peak at 600 nm is related to the PL peak and it is observed only in PPT spectra. These results suggest that different mechanisms are operating in PPT spectra and MPA ones for the enhancement of the PA spectra.
- Publication Office, Japanese Journal of Applied Physics, Faculty of Science, University of Tokyoの論文
- 2001-05-30
著者
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Ikari Tetsuo
Department Of Electrical And Electronic Engineering Miyazaki University
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Yoshino Kenji
Department Of Anatomy Nihon University School Of Dentistry At Matsudo
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Okamoto Masaki
Department Of Applied And Bioapplied Chemistry Graduate School Of Engineering Osaka City University
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KIMURA Akitsugu
Department of Materials Science and Engineering, National Defense Academy
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TAHIRA Kenichiro
Department of Electrical and Electronic Engineering, National Defense Academy
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Kawahara Toshio
Department Of Materials Science And Engineering National Defense Academy
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Morimoto Jun
Department Of Applied Physics National Defense Academy
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Miyakawa Toru
Department Of Applied Physics The National Defense Academy
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Miyakawa Toru
Department of Computer Science, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino 275-0016, Japan
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Kimura Akitsugu
Department of Human Genetics, Nagasaki University Graduate School of Biomedical Sciences
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Yoshino Kenji
Department of Electrical and Electronic Engineering, Miyazaki University, 1-1 Gakuen-kibanadainishi, Miyazaki 889-2192, Japan
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