Disentangling the role of wave function overlap, exciton–exciton interaction, carrier confinement and shape in the properties of spherical quantum wells  

作　　者：Marco Califano 

机构地区：[1]Pollard Institute,School of Electronic and Electrical Engineering,University of Leeds,Leeds LS29JT,UK [2]Bragg Centre for Materials Research,University of Leeds,Leeds LS29JT,UK

出　　处：《Nano Research》2025年第2期949-957,共9页纳米研究(英文版)

摘　　要：There is a widespread conviction,fuelled by simple effective mass theoretical modelling,that the enhanced optical properties of quantum shells(i.e.,CdS/CdSe/CdS core/shell in a shell structures)derive from a combination of relaxed carrier confinement,decreased overlap between electron and hole wave functions,reduced Coulomb interaction between photoinduced charge carriers and exciton-exciton repulsion,achieved in these nanoscopic spherical quantum wells(SQWs)by shape engineering.Confirming the origins of such properties by means of a more sophisticated theoretical framework is however important to ensure that future efforts at further improvement do not pursue the wrong strategy.Using the atomistic semiempirical pseudopotential method,we show that most of the assumptions behind such effects are incorrect,and that the origins of the peculiar optical properties of quantum shells are to be found elsewhere.

关 键 词：semiconductor nanocrystals quantum shells optical properties electronic structure pseudopotential method 

分 类 号：O41[理学—理论物理]