講演抄録/キーワード |
講演名 |
2007-11-17 14:40
Electrical properties of ZnSnAs2 thin films grown by MBE ○Joel T. Asubar・Tadasuke Yokoyama・Yoshio Jinbo・Naotaka Uchitomi(長岡技科大) CPM2007-125 エレソ技報アーカイブへのリンク:CPM2007-125 |
抄録 |
(和) |
Ternary ZnSnAs2 thin films were grown on n-type and semi-insulating (001) InP substrates by molecular beam epitaxy using the same grown conditions previously reported. In situ RHEED observations revealed streaky patterns indicating two dimensional growth mode for all the samples. HRXRD and Raman spectroscopy studies suggest the presence of both the chalcopyrite and sphalerite phases. Hall effect measurements in van der Pauw configuration from 5K to RT were then performed on the sample grown on the semi-insulating substrate. Hole concentration of p=5.98´1018 cm-3, hole mobility of m=23.61 cm2/Vs and resistivity of r=4.43´10-2 Ω-cm were obtained at room temperature. We confirmed the presence of a maximum in the Hall coefficient temperature dependence curve at ~130K similar to those reported in bulk chalcopyrite ZnSnAs2, which can be explained by two-band (valence and acceptor bands) model. From the temperature dependence of the valence band hole concentration, the impurity band was calculated to be located at 0.034eV from the valence band edge. Current-voltage measurements on the p-ZnSnAs2/n-InP heterojunction diode revealed I-V curves characteristic of a typical pn-junction. |
(英) |
Ternary ZnSnAs2 thin films were grown on n-type and semi-insulating (001) InP substrates by molecular beam epitaxy using the same grown conditions previously reported. In situ RHEED observations revealed streaky patterns indicating two dimensional growth mode for all the samples. HRXRD and Raman spectroscopy studies suggest the presence of both the chalcopyrite and sphalerite phases. Hall effect measurements in van der Pauw configuration from 5K to RT were then performed on the sample grown on the semi-insulating substrate. Hole concentration of p=5.98´1018 cm-3, hole mobility of m=23.61 cm2/Vs and resistivity of r=4.43´10-2 Ω-cm were obtained at room temperature. We confirmed the presence of a maximum in the Hall coefficient temperature dependence curve at ~130K similar to those reported in bulk chalcopyrite ZnSnAs2, which can be explained by two-band (valence and acceptor bands) model. From the temperature dependence of the valence band hole concentration, the impurity band was calculated to be located at 0.034eV from the valence band edge. Current-voltage measurements on the p-ZnSnAs2/n-InP heterojunction diode revealed I-V curves characteristic of a typical pn-junction. |
キーワード |
(和) |
ternary semiconductor / MBE / transport properties / van der Pauw / Impurity Band / / / |
(英) |
ternary semiconductor / MBE / transport properties / van der Pauw / Impurity Band / / / |
文献情報 |
信学技報, vol. 107, no. 325, CPM2007-125, pp. 103-107, 2007年11月. |
資料番号 |
CPM2007-125 |
発行日 |
2007-11-09 (CPM) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
著作権に ついて |
技術研究報告に掲載された論文の著作権は電子情報通信学会に帰属します.(許諾番号:10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
PDFダウンロード |
CPM2007-125 エレソ技報アーカイブへのリンク:CPM2007-125 |