Cu2Se Nanoparticles with Tunable Electronic Properties Due to a Controlled Solid-State Phase Transition Driven by Copper Oxidation and Cationic Conduction
Citations Over TimeTop 10% of 2010 papers
Abstract
Stoichiometric copper(I) selenide nanoparticles have been synthesized using the hot injection method. The effects of air exposure on the surface composition, crystal structure, and electronic properties were monitored using X-ray photoelectron spectroscopy, X-ray diffraction, and conductivity measurements. The current-voltage response changes from semiconducting to ohmic, and within a week a 3000-fold increase in conductivity is observed under ambient conditions. The enhanced electronic properties can be explained by the oxidation of Cu(+) and Se(2-) on the nanoparticle surface, ultimately leading to a solid-state conversion of the core from monoclinic Cu(2)Se to cubic Cu(1.8)Se. This behavior is a result of the facile solid-state ionic conductivity of cationic Cu within the crystal and the high susceptibility of the nanoparticle surface to oxidation. This regulated transformation is appealing as one could envision using layers of Cu(2)Se nanoparticles as both semiconducting and conducting domains in optoelectronic devices simply by tuning the electronic properties for each layer through controlled oxidation.
Related Papers
- → Axial thermal expansion of ZrO2and HfO2in the range room temperature to 1400°C(1969)212 cited
- → Synthesis of Monoclinic Potassium Niobate Nanowires That Are Stable at Room Temperature(2012)69 cited
- → Structural and vibrational properties of phase-pure monoclinic NdLuO3 interlanthanides synthesized from nanostructured precursors(2016)5 cited
- → On the polymorphism of orthotelluric acid, H6TeO6(1968)10 cited
- → Investigation of Monoclinic Content on Clinically Retrieved Zirconia Heads(2005)2 cited