title: Decoupling the effects of confinement and passivation on semiconductor quantum dots.
abstract: Semiconductor (SC) quantum dots (QDs) have recently been fabricated by both chemical and plasma techniques for specific absorption and emission of light. Their optical properties are governed by the size of the QD and the chemistry of any passivation at their surface. Here, we decouple the effects of confinement and passivation by utilising DC magnetron sputtering to fabricate SC QDs in a perfluorinated polyether oil. Very high band gaps are observed for fluorinated QDs with increasing levels of quantum confinement (from 4.2 to 4.6 eV for Si, and 2.5 to 3 eV for Ge), with a shift down to 3.4 eV for Si when oxygen is introduced to the passivation layer. In contrast, the fluorinated Si QDs display a constant UV photoluminescence (3.8 eV) irrespective of size. This ability to tune the size and passivation independently opens a new opportunity to extending the use of simple semiconductor QDs.
authors.affiliation: Future Industries Institute, University of South Australia, Mawson Lakes, South Australia, 5095, Australia. roya.rudd@mymail.unisa.edu.eu colin.hall@unisa.edu.au Peter.J.Murphy@unisa.edu.au Eric.Charrault@unisa.edu.au Drew.Evans@unisa.edu.au.
authors.forename: Roya
authors.initials: R
authors.lastname: Rudd
authors.affiliation: Future Industries Institute, University of South Australia, Mawson Lakes, South Australia, 5095, Australia. roya.rudd@mymail.unisa.edu.eu colin.hall@unisa.edu.au Peter.J.Murphy@unisa.edu.au Eric.Charrault@unisa.edu.au Drew.Evans@unisa.edu.au.
authors.forename: Colin
authors.initials: C
authors.lastname: Hall
authors.affiliation: Future Industries Institute, University of South Australia, Mawson Lakes, South Australia, 5095, Australia. roya.rudd@mymail.unisa.edu.eu colin.hall@unisa.edu.au Peter.J.Murphy@unisa.edu.au Eric.Charrault@unisa.edu.au Drew.Evans@unisa.edu.au.
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Murphy
authors.affiliation: School of Physics, University of New South Wales, Sydney, NSW 2052, Australia. p.reece@unsw.edu.au.
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Reece
authors.affiliation: Future Industries Institute, University of South Australia, Mawson Lakes, South Australia, 5095, Australia. roya.rudd@mymail.unisa.edu.eu colin.hall@unisa.edu.au Peter.J.Murphy@unisa.edu.au Eric.Charrault@unisa.edu.au Drew.Evans@unisa.edu.au.
authors.forename: Eric
authors.initials: E
authors.lastname: Charrault
authors.affiliation: Future Industries Institute, University of South Australia, Mawson Lakes, South Australia, 5095, Australia. roya.rudd@mymail.unisa.edu.eu colin.hall@unisa.edu.au Peter.J.Murphy@unisa.edu.au Eric.Charrault@unisa.edu.au Drew.Evans@unisa.edu.au.
authors.forename: Drew
authors.initials: D
authors.lastname: Evans