MULTISPECTRAL BACTERIAL IDENTIFICATION

Not Available We propose to design, fabricate and deliver a unique quasi-unipolar high temperature and high-speed 4H-SiC power diode for motor control applications by a novel ion implantation approach. Experimental effort will be the major concentration although theoretical work will also be performed to compare with experimental results, and more importantly to guide optimization activities in Phase II. For comparison purpose, conventional diodes will also be fabricated by using the same fabrication processes to quantify the benefits of the proposed diodes including both lower DC and AC power losses and high speed. In Phase I, we will develop the fabrication processes for the proposed diodes concentrating on minimizing reverse leakage current, maximizing power density, and demonstrating high speed switching as well as high temperature capability. Comparison will be made between the proposed diodes and state-of-the-art Si PiN diodes in terms of free-wheeling anti-parallel diode applications along with Si IGBTs in 3 phase AC induction motor control inverters up to lOOOV750HP. We will fabricate the proposed 4H-SiC diodes and deliver 6 6A-600Vdc and 6 4A-1000Vdc diodes and one 20A-l000Vdc diode module with greatly reduced power losses and capable of 250 C ambient operation. BENEFITS: High performance quasi-unipolar SiC diodes capable of operation at much higher power densities and temperatures with drastically reduced DC and AC power losses. Applications exist in numerous high temper