Abstract
In this paper, lead chalcogenide based thermoelectric nanolaminate structures were fabricated by alternately depositing PbTe and PbSe ALD layers on regular planar silicon wafers and on microporous silicon templates. Lead bis(2,2,6,6-tetramethyl-3,5-heptanedionato) (Pb(C11H19O2)2), plus (trimethylsilyl) telluride ((Me3Si)2Te) and (trimethylsilyl) selenide ((Me3Si)2Se) were used as the chemical ALD precursors for lead, tellurium and selenium, respectively. The Seebeck coefficient in horizontal direction (parallel direction to the surface) to the multiple layered PbTe/PbSe nanolaminate structures was measured by an MMR Seebeck system, and benchmarked against the Seebeck coefficient in the vertical direction to the sample surface. The results of the Seebeck measurements clearly indicate that the multiple layered PbTe/PbSe nanolaminate structures synthesized by ALD on microporous silicon templates exhibit significantly increased Seebeck coefficients in both horizontal and vertical directions, in stark contrast to the case when the same ALD thermoelectric nanolaminates are grown on regular planar bulk Si substrates.
Highlights
As a green renewable technology, thermoelectrics (TE) can play an important role in recovering energy from waste heat due to its potential in converting heat into electricity, and this effect could be applied in TE power generators or TE refrigerators
PbTe and PbSe films have been deposited by different techniques, such as pulsed laser deposition (PLD),[8] metal-organic chemical vapor deposition (MO-CVD),[9] magnetron sputtering,[10] molecular beam epitaxy (MBE)[11] and electrical-chemical atomic layer deposition (ALD).[12]
The crystal structure of the synthesized ALD films was analyzed by X-ray Diffraction (XRD)
Summary
As a green renewable technology, thermoelectrics (TE) can play an important role in recovering energy from waste heat due to its potential in converting heat into electricity, and this effect could be applied in TE power generators or TE refrigerators. Xin; Lin, Pengtao; Zhang, Kai; Baumgart, Helmut; Geist, Brian; and Kochergin, Vladimir, "Seebeck Coefficient Enhancement of ALD PbTe/PbSe Nanolaminate Structures Deposited Inside Porous Silicon Templates" (2016).
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