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Fabrication And Surface Treatment Of Semiconductor Photonic Crystals By Plasma Process.

T. Baba, K. Inoshita, Hiroyuki Ichikawa
Published 2001 · Chemistry

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Semiconductor photonic crystals are expected to realize the ultimate control of spontaneous emission, so-called Purcell effect. However, there are two important issues. One is a fine dry etching process for a high aspect ratio over 10 in submicron period structures. The other is a surface treatment for the reduction in surface recombination. With regard to these issues we have studied InP-based materials, since they have a low surface recombination velocity νs. We developed the etching process using the inductively coupled plasma. The surface recombination was evaluated through the lifetime measurement of photoluminescence at a wavelength over 1 µm using the phase resolved spectroscopy. We investigated various surface treatments and found that the CH4 plasma irradiation is effective for realizing crucial νs of 1×103 cm/s order. The SIMS analysis suggests that it is due to the electronic insulation near the surface by the shallow implantation of C.
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