Ligand-Controlled Colloidal Synthesis and Electronic Structure Characterization of Cubic Iron Pyrite (FeS2) Nanocrystals

Autor:	Ruimin Qiao, David K. Britt, Alessandra Lanzara, Chia-Chi Tuan, Wanli Yang, A. Paul Alivisatos, Sebastien D. Lounis, J. Matthew Lucas
Rok vydání:	2013
Předmět:	Materials science Chalcogenide Band gap General Chemical Engineering Oxide Nucleation Mineralogy Iron sulfide General Chemistry engineering.material chemistry.chemical_compound chemistry Chemical engineering Nanocrystal Materials Chemistry engineering Direct and indirect band gaps Pyrite
Zdroj:	Chemistry of Materials. 25:1615-1620
ISSN:	1520-5002 0897-4756
DOI:	10.1021/cm304152b
Popis:	Iron pyrite (FeS2) is a promising photovoltaic absorber because of its Earth abundance, high optical extinction, and infrared band gap (Eg = 0.95 eV), but its use has been hindered because of the difficulty of phase pure synthesis. Pyrite phase purity is a paramount concern, as other phases of iron sulfide have undesirable electronic properties. Here we report the synthesis of phase pure iron pyrite nanocrystals with cubic morphology and a mean dimension of 80 nm. Control over the nanocrystal shape was achieved using an unusual ligand, 1-hexadecanesulfonate. The particles were characterized via synchrotron X-ray spectroscopy, indicating an indirect band gap of 1.00 ± 0.11 eV and a valence bandwidth of nearly 1 eV. Transmission electron microscopy from early reaction stages suggests a nucleation and growth mechanism similar to solution precipitation syntheses typical of metal oxide nanocrystals, rather than the diffusion-limited growth process typical of hot-injection metal chalcogenide nanocrystal syntheses.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4a2da4dcb7ab0ef24bbffd01b733bd59 https://doi.org/10.1021/cm304152b Zobrazit plný text záznamu