High-performance thermoelectric silver selenide thin films cation exchanged from a copper selenide template

Nan Chen, Michael R. Scimeca, Shlok J. Paul, Shihab B. Hafiz, Dong Kyun Ko, Ayaskanta Sahu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Ag2Se has potentially excellent thermoelectric (TE) performance as an n-type semiconductor. It has been considered a promising alternative to Bi-Te alloys and other commonly used yet toxic and/or expensive TE materials. To optimize the TE performance of Ag2Se, recent research has focused on fabricating nanosized Ag2Se. However, synthesizing Ag2Se nanoparticles involves energy-intensive and time-consuming techniques with poor yield of final product. In this work, we report a low-cost, solution-processed approach that enables the formation of Ag2Se thin films from Cu2-xSe template films via cation exchange at room temperature. Our simple two-step method involves fabricating Cu2-xSe thin films by the thiolamine dissolution of bulk Cu2Se, followed by soaking Cu2-xSe films in AgNO3 solution and annealing to form Ag2Se. We report a maximum power factor (PF) of 825 µWm-1K-2 for our best-performing Ag2Se thin-film. This high PF has been achieved via full solution processing without hot-pressing.

Original languageEnglish (US)
Title of host publication2019 AIChE Annual Meeting
PublisherAmerican Institute of Chemical Engineers
ISBN (Electronic)9780816911127
StatePublished - 2019
Event2019 AIChE Annual Meeting - Orlando, United States
Duration: Nov 10 2019Nov 15 2019

Publication series

NameAIChE Annual Meeting, Conference Proceedings
Volume2019-November

Conference

Conference2019 AIChE Annual Meeting
CountryUnited States
CityOrlando
Period11/10/1911/15/19

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Chemistry(all)

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