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双异质结单载流子传输光敏晶体管输出电流

发布时间:2018-02-02 10:14

  本文关键词: 光敏晶体管 单载流子传输 输出电流 空间电荷效应 发射结注入效率 出处:《红外与毫米波学报》2017年05期  论文类型:期刊论文


【摘要】:详细对比并分析了双异质结单载流子传输光敏晶体管(Uni-travelling-carrier Double Heterojunction Phototransistor,UTC-DHPT)与单异质结光敏晶体管(Single Heterojunction Phototransistor,SHPT)在大的入射光功率范围下集电极输出电流特性.首先,UTC-DHPT仅选取窄带隙重掺杂的基区作为吸收区,与SHPT选取基区和集电区作为吸收区相比,其光吸收区厚度小,在小功率入射光下UTC-DHPT的输出电流小于SHPT的输出电流.其次,由于UTCDHPT的双异质结结构,光生电子和光生空穴产生于基区,减弱了SHPT因光生空穴在集电结界面积累而产生的空间电荷效应,避免了SHPT在小功率入射光下输出电流开始饱和的问题,从而UTC-DHPT获得了比SHPT更大的准线性工作范围.最后,UTC-DHPT的单载流子(电子)传输方式使得基区产生的光生空穴以介电弛豫的方式到达发射结界面,有效降低了发射结势垒,增加了单位时间内由发射区传输到基区的电子数量,提高了其发射结注入效率,在大功率入射光下UTC-DHPT比SHPT能获得更高的输出电流.
[Abstract]:A detailed comparison and analysis of the double heterostructure single carrier transmission (Uni-travelling-carrier Double Heterojunction Phototransistor photo transistor, UTC-DHPT) and single heterojunction phototransistor (Single Heterojunction, Phototransistor, SHPT) in the range of incident light power output collector current characteristics. First, the base UTC-DHPT is selected as the heavily doped narrow band gap absorption region SHPT and the selection of base region and the collector region as compared to the light absorption region, the absorption area of small thickness, the output current of small power incident light UTC-DHPT is less than SHPT. Secondly, the double heterostructure UTCDHPT, the photogenerated electrons and holes in the base region, weakened the effect of space charge SHPT because of photogenerated holes in the collector area of the ward tired to avoid SHPT in small power, the incident light output current began to saturation, which was UTC-DHPT 寰椾簡姣擲HPT鏇村ぇ鐨勫噯绾挎,

本文编号:1484274

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