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Injection modulation of p^+-n emitter junction in 4H-SiC light triggered thyristor by double-deck thin n-base 被引量:3
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作者 王曦 蒲红斌 +2 位作者 刘青 陈春兰 陈治明 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第10期496-500,共5页
To overcome hole-injection limitation of p^+-n emitter junction in 4H-SiC light triggered thyristor, a novel high- voltage 4H-SiC light triggered thyristor with double-deck thin n-base structure is proposed and demon... To overcome hole-injection limitation of p^+-n emitter junction in 4H-SiC light triggered thyristor, a novel high- voltage 4H-SiC light triggered thyristor with double-deck thin n-base structure is proposed and demonstrated by two- dimensional numerical simulations. In this new structure, the conventional thin n-base is split to double-deck. The hole- injection of p^+-n emitter junction is modulated by modulating the doping concentration and thickness of upper-deck thin n- base. With double-deck thin n-base, the current gain coefficient of the top pnp transistor in 4H-SiC light triggered thyristor is enhanced. As a result, the triggering light intensity and the turn-on delay time of 4H-SiC light triggered thyristor are both reduced. The simulation results show that the proposed 10-kV 4H-SiC light triggered thyristor is able to be triggered on by 500-mW/cm^2 ultraviolet light pulse. Meanwhile, the turn-on delay time of the proposed thyristor is reduced to 337 ns. 展开更多
关键词 silicon carbide light triggered thyristor double-deck thin n-base injection modulation
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n-strongly Gorenstein Projective and Injective and Flat Modules 被引量:3
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作者 YANG Xiao-yan 《Chinese Quarterly Journal of Mathematics》 CSCD 2014年第4期553-564,共12页
In this paper, we study some properties of n-strongly Gorenstein projective,injective and flat modules, and discuss some connections between n-strongly Gorenstein injective, projective and flat modules. Some applicati... In this paper, we study some properties of n-strongly Gorenstein projective,injective and flat modules, and discuss some connections between n-strongly Gorenstein injective, projective and flat modules. Some applications are given. 展开更多
关键词 n-strongly Gorenstein projective module n-strongly Gorenstein injective module n-strongly Gorenstein flat module
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Notes on Strongly n-Gorenstein Projective, Injective and Flat Modules 被引量:1
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作者 SHANG Wen-liang 《Chinese Quarterly Journal of Mathematics》 CSCD 2012年第3期389-396,共8页
In this paper, we mainly investigate some properties of strongly n-Gorenstein projective, injective and flat modules under the extension of rings, which mainly including excellent extensions, morita equivalences, poly... In this paper, we mainly investigate some properties of strongly n-Gorenstein projective, injective and flat modules under the extension of rings, which mainly including excellent extensions, morita equivalences, polynomial extensions and localizations. 展开更多
关键词 excellent extensions strongly n-Gorenstein projective modules strongly nGorenstein injective modules strongly n-Gorenstein flat modules
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EXPLICIT DESCRIPTION OF A CLASS OF INDECOMPOSABLE INJECTIVE MODULES
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作者 M.R.Pournaki M.Tousi 《Acta Mathematica Scientia》 SCIE CSCD 2005年第3期511-514,共4页
Let R be a commutative Noetherian ring and p be a prime ideal of R such that the ideal pRp is principal and ht(p)≠0. In this note, the anthors describe the explicit structure of the injective envelope of the R-module... Let R be a commutative Noetherian ring and p be a prime ideal of R such that the ideal pRp is principal and ht(p)≠0. In this note, the anthors describe the explicit structure of the injective envelope of the R-module R/p. 展开更多
关键词 Noetherian ring injective module indecomposable injective module injective envelope weakly locally principal prime ideal
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On Pseudo Small Injective Modules
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作者 ZHAO Yu, e DU Xian-neng 《Chinese Quarterly Journal of Mathematics》 CSCD 2013年第4期532-538,共7页
The definition of principally pseudo injectivity motivates us to generalize tae notion of injectivity, noted SP pseudo injectivity. The aim of this paper is to investigate characterizations and properties of SP pseudo... The definition of principally pseudo injectivity motivates us to generalize tae notion of injectivity, noted SP pseudo injectivity. The aim of this paper is to investigate characterizations and properties of SP pseudo injective modules. Various results are devel- oped, many extending known results. As applications, we give some characterizations on Noetherian rings, QI rings, quasi-Frobenius rings. 展开更多
关键词 SP pseudo injective modules semiregular modules SP injective modules co-Hopfian modules
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Simplified modeling of frequency behavior in photonic crystal vertical cavity surface emitting laser with tunnel injection quantum dot in active region
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作者 Mehdi Riahinasab Vahid Ahmadi Elham Darabi 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第2期260-267,共8页
In this work, the characteristics of the photonic crystal tunneling injection quantum dot vertical cavity surface emitting lasers(Ph C-TIQD-VCSEL) are studied through analyzing a modified modulation transfer functio... In this work, the characteristics of the photonic crystal tunneling injection quantum dot vertical cavity surface emitting lasers(Ph C-TIQD-VCSEL) are studied through analyzing a modified modulation transfer function. The function is based on the rate equations describing the carrier dynamics at different energy levels of dot and injector well. Although the frequency modulation response component associated with carrier dynamics in wetting layer(WL) and at excited state(ES) levels of dots limits the total bandwidth in conventional QD-VCSEL, our study shows that it can be compensated for by electron tunneling from the injector well into the dot in TIQD structure. Carrier back tunneling time is one of the most important parameters, and by increment of that, the bias current dependence of the total bandwidth will be insignificant. It is proved that at high bias current, the limitation of the WL-ES level plays an important role in reducing the total bandwidth and results in rollovers on 3-d B bandwidth-I curves. In such a way, for smaller air hole diameter of photonic crystal, the effect of this reduction is stronger. 展开更多
关键词 modulation transfer function photonic crystal(PhC) tunnel injection quantum dot(TIQD) vertical cavity surface emitting laser(VCSEL)
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