Tuning of p-n-p-Type Conduction in AgCuS through Cation Vacancy: Thermopower and Positron Annihilation Spectroscopy Investigations

Inorganic Chemistry
Moinak DuttaKanishka Biswas

Abstract

Understanding the complex phenomenon behind the structural transformations is a key requisite to developing important solid-state materials with better efficacy such as transistors, resistive switches, thermoelectrics, etc. AgCuS, a superionic semiconductor, exhibits temperature-dependent p-n-p-type conduction switching and a colossal jump in thermopower during an orthorhombic to hexagonal superionic transition. Tuning of p-n-p-type conduction switching in superionic compounds is fundamentally important to realize the correlation between electronic/phonon dispersion modulation with changes in the crystal structure and bonding, which might contribute to the design of better thermoelectric materials. Herein, we have created extrinsic Ag/Cu nonstoichiometry in AgCuS, which resulted in the vanishing of p-n-p-type conduction switching and improved its thermoelectric properties. We have performed the selective removal of cations and measured their temperature-dependent thermopower and Hall coefficient, which demonstrates only p-type conduction in the Ag1- xCuS and AgCu1- xS samples. The removal of Cu is much more efficient in arresting conduction switching, whereas in the case of Ag vacancy, p-n-p-type conduction switching vanishes a...Continue Reading

References

Nov 15, 2007·Angewandte Chemie·Qichun ZhangPingyun Feng
Jan 20, 2009·Nature Materials·Tom NilgesRichard Weihrich
Jan 24, 2009·Nature Materials·Jürgen Janek
Jun 24, 2010·Nature Chemistry·Shin-Ichi OhkoshiHiroko Tokoro
Nov 26, 2010·Nature Chemistry·Eugenio CoronadoPeter J Baker
Apr 5, 2011·Journal of Physics. Condensed Matter : an Institute of Physics Journal·A SarkarD Sanyal
Mar 13, 2012·Nature Materials·Huili LiuG Jeffrey Snyder
Oct 17, 2012·Journal of the American Chemical Society·Chong XiaoYi Xie
Dec 19, 2012·Inorganic Chemistry·D Santamaria-PerezM Jansen
Mar 21, 2013·Journal of the American Chemical Society·Lin PanNita Dragoe
Apr 23, 2013·Nature Materials·S IshiwataY Tokura
Aug 20, 2014·Journal of the American Chemical Society·Satya N GuinKanishka Biswas
Mar 31, 2015·Physical Chemistry Chemical Physics : PCCP·Satya N Guin, Kanishka Biswas

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