Small-Sized PbSe/PbS Core/Shell Colloidal Quantum Dots

Autor:	Nathan Grumbach, Anna Rubin-Brusilovski, Aldona Sashchiuk, Georgy I. Maikov, Efrat Lifshitz, Olga Solomeshch, Diana Yanover, Richard Capek, Roman Vaxenburg
Rok vydání:	2012
Předmět:	Materials science business.industry General Chemical Engineering Exciton Exchange interaction General Chemistry Molecular physics Core shell symbols.namesake Absorption edge Stokes shift Materials Chemistry symbols Optoelectronics Quantum efficiency Colloidal quantum dots Anisotropy business
Zdroj:	Chemistry of Materials. 24:4417-4423
ISSN:	1520-5002 0897-4756
DOI:	10.1021/cm302793k
Popis:	The work focuses on the synthesis of small-sized PbSe/PbS core/shell colloidal quantum dots with the core diameter of 2–2.5 nm and the shell thickness of 0.5–1.0 nm. The PbSe/PbS core/shell CQDs are chemically stable under time-limited air exposure and have emission quantum efficiency of 60% at room temperature. The PbSe/PbS core/shell CQDs have a tunable absorption edge around 1 μm, large exciton emission Stokes shift (∼150 meV), and small exchange interaction (∼1.5 meV). Theoretical calculations associate the mentioned parameters to the small-size regime as well as to a lift of band-edge degeneracy due to slight shape anisotropy. The specific parameters are of special interest in photovoltaic applications.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::990742b30652dcc395a9db251ca2e1a5 https://doi.org/10.1021/cm302793k Zobrazit plný text záznamu