Journal article
Solution-Based Stoichiometric Control over Charge Transport in Nanocrystalline CdSe Devices
ACS nano, v 7(10), pp 8760-8770
22 Oct 2013
PMID: 24047327
Abstract
Using colloidal CdSe nanowire (NW) field-effect transistors (FETs), we demonstrated the dependence of carrier transport on surface stoichiometry by chemically manipulating the atomic composition of the NW surface. A mild, room-temperature, wet-chemical process was devised to introduce cadmium, selenium, or sulfur adatoms at the surface of the NWs in completed devices. Changes in surface composition were tested for by energy dispersive spectroscopy and Inductively coupled plasma-atomic emission spectroscopy and through the use of the vibrational reporter thiocyanate. We found that treatment with cadmium acetate enhances electron currents, while treatment with sodium selenide or sodium sulfide suppressed them. The efficacy of doping CdSe NWs through subsequent thermal diffusion of indium was highly dependent on the surface composition. While selenium-enriched CdSe NW FETs were characterized by little to no electron currents, when combined with indium, they yielded semimetallic devices. Sulfur-enriched, indium-doped devices also displayed dramatically enhanced electron currents, but to a lesser extent than selenium and formed FETs with desirable l(ON)/l(OFF) >10(6). The atomic specificity of the electronic behavior with different surface chalcogens suggested indium was bound to chalcogens at the NW surface, indicating commonalities with and implications for indium-containing CdSe nanoaystal films. Low temperature measurements of indium-doped CdSe NW FETs showed no evidence of impurity scattering, further supporting the existence of an indium-thalcogen interaction at the surface rather than in the core of the NW.
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Details
- Title
- Solution-Based Stoichiometric Control over Charge Transport in Nanocrystalline CdSe Devices
- Creators
- David K. Kim - University of PennsylvaniaAaron T. Fafarman - University of PennsylvaniaBenjamin T. Diroll - University of PennsylvaniaSilvia H. Chan - University of PennsylvaniaThomas R. Gordon - University of PennsylvaniaChristopher B. Murray - University of PennsylvaniaCherie R. Kagan - University of Pennsylvania
- Publication Details
- ACS nano, v 7(10), pp 8760-8770
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 11
- Grant note
- DMR-0805155; CBET-1236406 / NSF; National Science Foundation (NSF) DMR08-32802 / NSF Nano/Bio Interface Center at the University of Pennsylvania DE-SC0002158 / U.S. Department of Energy Office of Basic Energy Sciences, Division of Materials Science and Engineering; United States Department of Energy (DOE) Richard Perry University 1236406 / Div Of Chem, Bioeng, Env, & Transp Sys; National Science Foundation (NSF); NSF - Directorate for Engineering (ENG)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000326209100046
- Scopus ID
- 2-s2.0-84886995553
- Other Identifier
- 991020834712904721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Chemistry, Multidisciplinary
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology