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    • 1. 发明申请
    • 炭化珪素単結晶および単結晶ウェハ
    • 单晶碳化硅单晶和单晶水晶
    • WO2005123992A1
    • 2005-12-29
    • PCT/JP2005/011390
    • 2005-06-15
    • 新日本製鐵株式会社澤村 充藤本 辰雄大谷 昇中林 正史
    • 澤村 充藤本 辰雄大谷 昇中林 正史
    • C30B29/36
    • C30B23/00C30B29/36
    • A semiinsulating silicon carbide single crystal of >= 1x10 ohmcm electric resistivity at room temperature, comprising vacancy clusters each composed of an assembly of multiple atomic vacancies; a semiinsulating silicon carbide single crystal of >= 1x10 ohmcm electric resistivity at room temperature, comprising vacancy pairs (double vacancies); a semiinsulating silicon carbide single crystal of >= 1x10 ohmcm electric resistivity at room temperature, comprising crystal regions exhibiting an average life duration of positron, determined in a positron life duration measurement at 155 ps; and wafers obtained therefrom. By virtue of having of vacancy clusters including vacancy pairs, not only can lowering of electric conductivity be attained even in a state of nitrogen concentration exceeding boron concentration but also there can be obtained a semiinsulating silicon carbide whose electric conductivity change by heat treatment is suppressed.
    • 室温下> 1×10 5欧姆·厘米·厘米电阻率的半绝缘碳化硅单晶,包括由多个原子空位的组合构成的空位簇; 在室温下具有> = 1×10 5Ωhm电阻率的半绝缘碳化硅单晶,包括空位对(双空位); 在室温下具有> = 1×10 5欧姆电阻率的半绝缘碳化硅单晶,包括在正极寿命测量中在<=液氮沸点温度(77K)下测定的具有正电子平均寿命的晶体区域, ,> 155 ps; 和从其获得的晶片。 由于具有包括空位对的空位簇,即使在超过硼浓度的氮浓度的状态下也不会降低导电性,而且可以获得抑制通过热处理导电性变化的半绝缘碳化硅。