提出了一种计算超低泄漏电流硅二极管的单粒子位移损伤电流的方法。采用SRIM软件计算了252Cf源的裂变碎片入射二极管产生的初级撞出原子的分布,并采用Shockley-Read-Hall复合理论探讨了单粒子位移损伤电流值与缺陷参数的关系,计算了252C...提出了一种计算超低泄漏电流硅二极管的单粒子位移损伤电流的方法。采用SRIM软件计算了252Cf源的裂变碎片入射二极管产生的初级撞出原子的分布,并采用Shockley-Read-Hall复合理论探讨了单粒子位移损伤电流值与缺陷参数的关系,计算了252Cf源辐照引起的单粒子位移损伤电流台阶值,计算结果与实验结果一致。针对耗尽区电场非均匀的特点,提出电场分层近似方法来考虑处于耗尽区中不同位置的初级撞出原子产生的缺陷对泄漏电流的影响。结果表明,PN结附近电场增强载流子产生效应最显著,考虑电场增强效应的情况下单个Frenkel缺陷引起的泄漏电流比未考虑电场增强效应时高约44倍;裂变碎片80 Me V Nd入射比106 Me V Cd入射引起的单粒子位移损伤电流大;252Cf源的裂变碎片在二极管中引起的单粒子位移损伤电流台阶值主要集中于1 f A至1 p A之间。展开更多
The paper assesses the economic impacts of the natural forest protection program （NFPP） on the economy of Yunnan Province, China.in terms of gross output, value added,employment, and household income. An inputoutput...The paper assesses the economic impacts of the natural forest protection program （NFPP） on the economy of Yunnan Province, China.in terms of gross output, value added,employment, and household income. An inputoutput model is developed to estimate NFPP＇s economic impacts by means of backward linkages in the forestry sector and logging and haudage sector. It is found than the NFPP has positive impacts on gross output, value added and houschold income in the initial year, but has significantly negative impacts on the regional economy in the following years as the investment decreases.展开更多
文摘提出了一种计算超低泄漏电流硅二极管的单粒子位移损伤电流的方法。采用SRIM软件计算了252Cf源的裂变碎片入射二极管产生的初级撞出原子的分布,并采用Shockley-Read-Hall复合理论探讨了单粒子位移损伤电流值与缺陷参数的关系,计算了252Cf源辐照引起的单粒子位移损伤电流台阶值,计算结果与实验结果一致。针对耗尽区电场非均匀的特点,提出电场分层近似方法来考虑处于耗尽区中不同位置的初级撞出原子产生的缺陷对泄漏电流的影响。结果表明,PN结附近电场增强载流子产生效应最显著,考虑电场增强效应的情况下单个Frenkel缺陷引起的泄漏电流比未考虑电场增强效应时高约44倍;裂变碎片80 Me V Nd入射比106 Me V Cd入射引起的单粒子位移损伤电流大;252Cf源的裂变碎片在二极管中引起的单粒子位移损伤电流台阶值主要集中于1 f A至1 p A之间。
文摘The paper assesses the economic impacts of the natural forest protection program （NFPP） on the economy of Yunnan Province, China.in terms of gross output, value added,employment, and household income. An inputoutput model is developed to estimate NFPP＇s economic impacts by means of backward linkages in the forestry sector and logging and haudage sector. It is found than the NFPP has positive impacts on gross output, value added and houschold income in the initial year, but has significantly negative impacts on the regional economy in the following years as the investment decreases.
