Engineering Temperature-Dependent Carrier Concentration in Bulk Composite Materials via Temperature-Dependent Fermi Level Offset

Si Hui, Wenpei Gao, Xu Lu, Anurag Panda, Trevor P. Bailey, Alexander A. Page, Stephen R. Forrest, Donald T. Morelli, Xiaoqing Pan, Kevin P. Pipe, Ctirad Uher

Research output: Research - peer-reviewArticle

Abstract

Precise control of carrier concentration in both bulk and thin-film materials is crucial for many solid-state devices, including photovoltaic cells, superconductors, and high mobility transistors. For applications that span a wide temperature range (thermoelectric power generation being a prime example) the optimal carrier concentration varies as a function of temperature. This work presents a modified modulation doping method to engineer the temperature dependence of the carrier concentration by incorporating a nanosize secondary phase that controls the temperature-dependent doping in the bulk matrix. This study demonstrates this technique by de-doping the heavily defect-doped degenerate semiconductor GeTe, thereby enhancing its average power factor by 100% at low temperatures, with no deterioration at high temperatures. This can be a general method to improve the average thermoelectric performance of many other materials.

LanguageEnglish (US)
JournalAdvanced Energy Materials
DOIs
StateAccepted/In press - 2017

Profile

Fermi level
Carrier concentration
Composite materials
Temperature
Doping (additives)
Solid state devices
Phase control
Photovoltaic cells
Thermoelectric power
Superconducting materials
Power generation
Deterioration
Transistors
Modulation
Semiconductor materials
Engineers
Thin films
Defects

Keywords

  • Composite materials
  • Modulation doping
  • Thermoelectric materials

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Engineering Temperature-Dependent Carrier Concentration in Bulk Composite Materials via Temperature-Dependent Fermi Level Offset. / Hui, Si; Gao, Wenpei; Lu, Xu; Panda, Anurag; Bailey, Trevor P.; Page, Alexander A.; Forrest, Stephen R.; Morelli, Donald T.; Pan, Xiaoqing; Pipe, Kevin P.; Uher, Ctirad.

In: Advanced Energy Materials, 2017.

Research output: Research - peer-reviewArticle

Hui, Si ; Gao, Wenpei ; Lu, Xu ; Panda, Anurag ; Bailey, Trevor P. ; Page, Alexander A. ; Forrest, Stephen R. ; Morelli, Donald T. ; Pan, Xiaoqing ; Pipe, Kevin P. ; Uher, Ctirad. / Engineering Temperature-Dependent Carrier Concentration in Bulk Composite Materials via Temperature-Dependent Fermi Level Offset. In: Advanced Energy Materials. 2017
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