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Dielectric Confinement Effect on Calculating the Band Gap of PbSe Quantum Dots
Wen-chao Cheng,Tie-qiang Zhang,Yu Zhang*
Author NameAffiliationE-mail
Wen-chao Cheng State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China College of Physics, State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China  
Tie-qiang Zhang State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China  
Yu Zhang* State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China College of Physics, State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China zy190117@163.com 
Abstract:
Considering the dielectric confinement effect on excitonics of PbSe quantum dots (QDs), a correction factor in the wave function was introduced to propose a new band gap calculation model for QDs. The modified model showed great consistency with the experimental data, especially in small size range. According to the variation of confined barrier, the band gap calculation model of PbSe QDs was analyzed in different solvents. The calculating results showed that the modified model was almost solvent-independent, which was consistent with our experimental results and related reports.
Key words:  Dielectric confinement effect, PbSe, Band gap
FundProject:
介电限域效应对PbSe量子点禁带宽度计算的影响研究
程文超,张铁强,张宇*
摘要:
考虑了PbSe量子点介电限域效应对激子的影响,引入了修正因子,提出了一种新的量子点禁带宽度的计算模型.与实验数据比较,两者具有良好的一致性.尤其是在小尺寸量子点的情况下,修正后的模型与实验值表现出更好的一致性.通过调整受限势垒的大小,分析不同溶剂条件下PbSe禁带宽度的计算模型,说明采用的修正模型对溶剂的变化是不敏感的,与实验的结论是一致的.
关键词:  介电限域效应,硒化铅,禁带宽度
DOI:10.1088/1674-0068/24/02/162-166
分类号: