Effect of symmetry breaking on the optical absorption of semiconductor nanoparticles

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	Effect of symmetry breaking on the optical absorption of semiconductor nanoparticles
	Gali, A ; Kaxiras, E ; Zimanyi, GT ; Meng, S
刊名	PHYSICAL REVIEW B
	2011
卷号	84 期号:3
关键词	MULTIPLE EXCITON GENERATION PBSE QUANTUM DOTS EFFICIENCY CARRIER MULTIPLICATION CDSE NANOCRYSTALS ELECTRONIC-STRUCTURE COLLOIDAL PBSE RODS CONFINEMENT FILMS
ISSN号	1098-0121
通讯作者	Gali, A: Hungarian Acad Sci, Res Inst Solid State Phys & Opt, POB 49, H-1525 Budapest, Hungary.
中文摘要	The shape of semiconductor nanoparticles (NPs) can have an important influence on their optical absorption spectra with enhanced absorption resulting from breaking their symmetries. To illustrate this effect, we present broad energy optical excitation spectra of similar to 2 nm Si and PbSe nanoparticles, obtained from extensive time-dependent density functional theory calculations. We considered both highly symmetric spherical shapes and low-symmetry rodlike and disklike shapes. The low-symmetry shapes exhibit an increase in absorption at low and relatively high energies compared to the absorption of spherical NPs of similar volume, independent of their chemical compositions and surface structures. Our results elucidate the mechanism of enhanced multiexciton generation in semiconductor NPs, which is important in the quest to improve their photovoltaic applications.
收录类别	SCI
资助信息	Hungarian OTKA [K-67886]; Hungarian Academy of Sciences; NHDP [TAMOP-4.2.1/B-09/1/KMR-2010-0002]; CAS and NSFC [11074287]; NSF-SOLAR [1035468]
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/36579]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Gali, A,Kaxiras, E,Zimanyi, GT,et al. Effect of symmetry breaking on the optical absorption of semiconductor nanoparticles[J]. PHYSICAL REVIEW B,2011,84(3).
APA	Gali, A,Kaxiras, E,Zimanyi, GT,&Meng, S.(2011).Effect of symmetry breaking on the optical absorption of semiconductor nanoparticles.PHYSICAL REVIEW B,84(3).
MLA	Gali, A,et al."Effect of symmetry breaking on the optical absorption of semiconductor nanoparticles".PHYSICAL REVIEW B 84.3(2011).