Change of the electron effective mass in extremely heavily doped n-type Si obtained by ion implantation and laser annealing |
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Authors: | M Miyao T Motooka N Natsuaki T Tokuyama |
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Institution: | Central Research Laboratory, Hitachi Ltd., Kokubunji, Tokyo 185, Japan |
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Abstract: | Infrared optical properties of extremely heavily doped n-type Si, obtained by ion implantation and laser annealing, were studied. A new relation between free carrier effective mass (m1) and carrier concentration (1019 ?5 × 1021cm-3) was obtained. The value of m1 increases significantly with the increase of carrier concentration, when carrier concentration exceeds 1021cm-3. The result is discussed in relation to the occupation of electrons in a new valley of the conduction band. |
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