Abstract
Layered transition metal dichalcogenides (TMDCs) intercalated with alkali metals exhibit mixed metallic and semiconducting phases with variable fractions. Thermoelectric properties of such mixed-phase structure are of great interest because of the potential energy filtering effect, wherein interfacial energy barriers strongly scatter cold carriers rather than hot carriers, leading to enhanced Seebeck coefficient ( S). Here, we study the thermoelectric properties of mixed-phase Li xMoS2 as a function of its phase composition tuned by in situ thermally driven deintercalation. We find that the sign of Seebeck coefficient changes from positive to negative during initial reduction of the 1T/1T' phase fraction, indicating crossover from p- to n-type carrier conduction. These anomalous changes in Seebeck coefficient, which cannot be simply explained by the effect of deintercalation-induced reduction in carrier density, can be attributed to the hybrid electronic property of the mixed-phase Li xMoS2. Our work shows that careful phase engineering is a promising route toward achieving thermoelectric performance in TMDCs.
References
Aug 15, 1991·Physical Review. B, Condensed Matter· Jiménez Sandoval SJ C Irwin
Apr 29, 2009·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Joachim Sonntag
Jul 18, 2012·ACS Nano·Goki EdaManish Chhowalla
Nov 12, 2013·The Journal of Chemical Physics·Ting HuJinming Dong
Apr 15, 2014·Journal of the American Chemical Society·Lifen WangXuedong Bai
Apr 22, 2014·Nature Nanotechnology·Yung-Chang LinKazu Suenaga
Jul 2, 2014·Nature Communications·Karel-Alexander N DuerlooEvan J Reed
Sep 1, 2014·Nature Materials·Rajesh KapperaManish Chhowalla
May 15, 2015·Advanced Materials·Joonki SuhJunqiao Wu
Jul 3, 2015·Nano Letters·Yinsheng GuoLouis E Brus
Feb 18, 2016·Journal of the American Chemical Society·Mukkannan AzhagurajanKingo Itaya
Oct 22, 2016·Nature Communications·Gaohua ZhuDavid G Cahill
Mar 2, 2017·Advanced Materials·Simone BertolazziPaolo Samorì
Aug 6, 2017·Scientific Reports·Qingmei SuBingshe Xu
Oct 12, 2017·Nature·Ying WangXiang Zhang
May 2, 2018·ACS Nano·Sherman Jun Rong TanKian Ping Loh
May 26, 2018·Nature Communications·Xiahan SangRaymond R Unocic
Citations
May 27, 2020·Chemical Society Reviews·Maria S Sokolikova, Cecilia Mattevi
Feb 19, 2021·Nanotechnology·Feng XiongEric Pop
Aug 17, 2021·Chemical Society Reviews·Xinmao YinAndrew T S Wee
Oct 18, 2020·Journal of Colloid and Interface Science·R AbinayaM Shimomura