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- W4205134137 abstract "Abstract To reveal the causes of infrared absorption in the wavelength region between electronic and lattice absorptions, we measured the temperature dependence of the absorption coefficient of p -type low-resistivity ( $$sim 10^2~ Omega mathrm{cm}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mo>∼</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mn>2</mml:mn> </mml:msup> <mml:mspace /> <mml:mi>Ω</mml:mi> <mml:mi>cm</mml:mi> </mml:mrow> </mml:math> ) CdZnTe crystals. We measured the absorption coefficients of CdZnTe crystals in four wavelength bands ( $$lambda =6.45$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>λ</mml:mi> <mml:mo>=</mml:mo> <mml:mn>6.45</mml:mn> </mml:mrow> </mml:math> , 10.6, 11.6, 15.1 $$~mu $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mspace /> <mml:mi>μ</mml:mi> </mml:mrow> </mml:math> m) over the temperature range of $$T=8.6$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>T</mml:mi> <mml:mo>=</mml:mo> <mml:mn>8.6</mml:mn> </mml:mrow> </mml:math> -300 K with an originally developed system. The CdZnTe absorption coefficient was measured to be $$alpha =0.3$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>α</mml:mi> <mml:mo>=</mml:mo> <mml:mn>0.3</mml:mn> </mml:mrow> </mml:math> -0.5 $$mathrm{cm}^{-1}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msup> <mml:mrow> <mml:mi>cm</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math> at $$T=300$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>T</mml:mi> <mml:mo>=</mml:mo> <mml:mn>300</mml:mn> </mml:mrow> </mml:math> K and $$alpha =0.4$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>α</mml:mi> <mml:mo>=</mml:mo> <mml:mn>0.4</mml:mn> </mml:mrow> </mml:math> -0.9 $$mathrm{cm}^{-1}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msup> <mml:mrow> <mml:mi>cm</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math> at $$T=8.6$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>T</mml:mi> <mml:mo>=</mml:mo> <mml:mn>8.6</mml:mn> </mml:mrow> </mml:math> K in the investigated wavelength range. With an absorption model based on transitions of free holes and holes trapped at an acceptor level, we conclude that the absorption due to free holes at $$T=150$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>T</mml:mi> <mml:mo>=</mml:mo> <mml:mn>150</mml:mn> </mml:mrow> </mml:math> -300 K and that due to trapped-holes at $$T<50$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>T</mml:mi> <mml:mo><</mml:mo> <mml:mn>50</mml:mn> </mml:mrow> </mml:math> K are dominant absorption causes in CdZnTe. We also discuss a method to predict the CdZnTe absorption coefficient at cryogenic temperature based on the room-temperature resistivity." @default.
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- W4205134137 date "2022-01-03" @default.
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- W4205134137 title "Infrared Absorption and Its Sources of CdZnTe at Cryogenic Temperature" @default.
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- W4205134137 doi "https://doi.org/10.1007/s11664-021-09361-1" @default.
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