Document Detail

Synthesis, Characterization, and Variable Range Hopping Transport of Pyrite (FeS2) Nanorods, Nanobelts and Nanoplates.
MedLine Citation:
PMID:  23330940     Owner:  NLM     Status:  Publisher    
We report the growth, structural and electrical characterization of single-crystalline iron pyrite (FeS2) nanorods, nanobelts and nanoplates synthesized via sulfidation reaction with iron dichloride (FeCl2) and iron dibromide (FeBr2). The as-synthesized products were confirmed to be single-crystal phase pure cubic iron pyrite using powder X-ray diffraction, Raman spectroscopy, and transmission electron microscopy. An intermediate reaction temperature of 425 oC or a high sulfur vapor pressure under high temperatures were found to be critical for the formation of phase pure pyrite. Field effect transport measurements showed that these pyrite nanostructures appear to behave as a moderately p-doped semiconductors with an average resistivity of 2.19 ± 1.21 Ω cm, an improved hole mobility of 0.2 cm2 V-1 s-1 and a lower carrier concentrations on the order of 1018-1019 cm-3 compared with previous reported pyrite nanowires. Temperature dependent electrical transport measurements reveal Mott variable range hopping transport in the temperature range of 40-220 K and transport via thermal activation of carriers with an activation energy of 100 meV above room temperature (300-400 K). Most importantly, the transport properties of the pyrite nanodevices do not change if highly pure (99.999%) precursors are utilized, suggesting that the electrical transport is dominated by intrinsic defects in pyrite. These single-crystal pyrite nanostructures are nice platforms to further study the carrier conduction mechanisms, semiconductor defect physics, and surface properties in depth, towards improving the physical properties of pyrite for efficient solar energy conversion.
Miguel Cabán-Acevedo; Dong Liang; Kit S Chew; John P Degrave; Nicholas S Kaiser; Song Jin
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-21
Journal Detail:
Title:  ACS nano     Volume:  -     ISSN:  1936-086X     ISO Abbreviation:  ACS Nano     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101313589     Medline TA:  ACS Nano     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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