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An Improved Symmetrically-Graded Doped-Channel Heterostructure Field-Effect Transistor
Ke-Hua Su,Wei-Chou Hsu,Chang-Luen Wu,Ching-Sung Lee,Po-Jung Hu,Yeong-Jia Chen,Yu-Shyan Lin 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.6
A new heterostructure field-effect transistor with an InGaAs symmetrically-graded doped-channel (SGDC) structure has been successfully investigated. The channel design demonstrated a reduced Coulomb scattering phenomenon by confining the conduction electrons away from the channel/spacer interface. Consequently, a higher current density, a higher breakdown voltage, a wider gate-voltage swing, a higher transconductance, a higher threshold voltage, and improved microwave and power characteristics were achieved by using the SGDC structure, as compared to those of conventional doped-channel devices. Besides, the AlGaAs/GaAs superlattice buffer structure was used to improve the high-temperature threshold-voltage characteristics.