Effect of Ligand Structure on the Optical and Electronic Properties of Nanocrystalline PbSe Films

被引：17

作者：

Smith, Anthony R. ^{[1
]}

Yoon, Woojun ^{[1
]}

Heuer, William B. ^{[2
]}

Baril, Sophie I. M. ^{[3
]}

Boercker, Janice E. ^{[1
]}

Tischler, Joseph G. ^{[1
]}

Foos, Edward E. ^{[1
]}

机构：

[1] USN, Res Lab, Washington, DC 20375 USA

[2] USN Acad, Dept Chem, Annapolis, MD 21402 USA

[3] George Washington Univ, Sch Engn & Appl Sci, Washington, DC 20052 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2012年 / 116卷 / 10期

关键词：

MULTIPLE EXCITON GENERATION; QUANTUM DOTS; SURFACE; ACIDS; ASSEMBLIES; MOLECULES; CHEMISTRY; MECHANISM; EMISSION; SOLIDS;

D O I：

10.1021/jp2111023

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Films of nanocrystalline PbSe were fabricated with a set of structurally varied short-chain dicarboxylic acids. Oxidation rates were studied via NIR spectroscopy to determine the effect of the structure of the diacid ligands on film stability under ambient conditions. Ligands favoring a non-bridging bonding mode were found to provide the best protection against oxidation, while among ligands expected to bridge between adjacent nanocrystals in the films, those with shorter chain lengths conferred better oxidative stability. Electronic coupling was observed as a red shift in the optical data of the ground excitonic peak of the PbSe films and found to be strongly influenced by the structure of the ligand. Transport measurements were made in air using thin-film transistors that were treated with a thin Al2O3 coating via remote plasma ALD. Films prepared using fumaric, maleic, and oxalic acids yielded mobility numbers of 2.5 x 10(-5), 3.7 x 10(-5), and 1.6 x 10(-3) cm(2)/V.s, respectively. Results suggest that the internanocrystal distance is the major contributor to electron mobility through the nanocrystalline films, while the electronic coupling is heavily influenced by multiple factors related to the structure of the surface ligands in addition to the internanocrystal distance.

引用

页码：6031 / 6037

页数：7

共 34 条

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