Performance characteristics of high-purity mid-wave and long-wave infrared type-II InAs/GaSb superlattice infrared photodiodes
Identifieur interne : 008651 ( Main/Repository ); précédent : 008650; suivant : 008652Performance characteristics of high-purity mid-wave and long-wave infrared type-II InAs/GaSb superlattice infrared photodiodes
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Abstract
The authors report on recent advances in the development of mid-, long-, and very long-wavelength infrared (MWIR, LWIR, and VLWIR) type-II InAs/GaSb superlattice infrared photodiodes. The residual carrier background of binary type-II InAs/GaSb superlattice photodiodes of cut-off wavelengths around 5 μm has been studied in the temperature range between 10 and 200 K. A four-point, capacitance-voltage technique on mid-wavelength and long-wavelength type-II InAs/GaSb superlattice infrared photodiodes reveal residual background concentrations around 5 x 1014 cm-3. Additionally, recent progress towards LWIR photodiodes for focal plane array imaging applications is presented. Single element detectors with a cut-off wavelength, λc,50%, of 10.2 μm demonstrated detectivities of approximately 1×1011 cmHz1/2W-1 and quantum efficiencies of 32% at the peak responsivity wavelength of around 7.9 μm. Furthermore, high-performance VLWIR single element photodiodes are discussed. The silicon dioxide passivation of VLWIR photodiodes is also presented, which resulted in an approximately 5 times increase of the sidewall resistivity. The latest developments in this material system lend further support for its use as a high-performance alternative for infrared optical systems compared to the current state-of-the-art imaging systems, especially those approaching the long-wavelength and very-long-wavelength infrared.
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<author><name sortKey="Hood, Andrew" uniqKey="Hood A">Andrew Hood</name>
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<author><name sortKey="Razeghi, Manijeh" uniqKey="Razeghi M">Manijeh Razeghi</name>
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<author><name sortKey="Nathan, Vaidya" uniqKey="Nathan V">Vaidya Nathan</name>
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<front><div type="abstract" xml:lang="en">The authors report on recent advances in the development of mid-, long-, and very long-wavelength infrared (MWIR, LWIR, and VLWIR) type-II InAs/GaSb superlattice infrared photodiodes. The residual carrier background of binary type-II InAs/GaSb superlattice photodiodes of cut-off wavelengths around 5 μm has been studied in the temperature range between 10 and 200 K. A four-point, capacitance-voltage technique on mid-wavelength and long-wavelength type-II InAs/GaSb superlattice infrared photodiodes reveal residual background concentrations around 5 x 10<sup>14</sup>
cm<sup>-3</sup>
. Additionally, recent progress towards LWIR photodiodes for focal plane array imaging applications is presented. Single element detectors with a cut-off wavelength, λ<sub>c,50%</sub>
, of 10.2 μm demonstrated detectivities of approximately 1×10<sup>11</sup>
cmHz<sup>1/2</sup>
W<sup>-1</sup>
and quantum efficiencies of 32% at the peak responsivity wavelength of around 7.9 μm. Furthermore, high-performance VLWIR single element photodiodes are discussed. The silicon dioxide passivation of VLWIR photodiodes is also presented, which resulted in an approximately 5 times increase of the sidewall resistivity. The latest developments in this material system lend further support for its use as a high-performance alternative for infrared optical systems compared to the current state-of-the-art imaging systems, especially those approaching the long-wavelength and very-long-wavelength infrared.</div>
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cm<sup>-3</sup>
. Additionally, recent progress towards LWIR photodiodes for focal plane array imaging applications is presented. Single element detectors with a cut-off wavelength, λ<sub>c,50%</sub>
, of 10.2 μm demonstrated detectivities of approximately 1×10<sup>11</sup>
cmHz<sup>1/2</sup>
W<sup>-1</sup>
and quantum efficiencies of 32% at the peak responsivity wavelength of around 7.9 μm. Furthermore, high-performance VLWIR single element photodiodes are discussed. The silicon dioxide passivation of VLWIR photodiodes is also presented, which resulted in an approximately 5 times increase of the sidewall resistivity. The latest developments in this material system lend further support for its use as a high-performance alternative for infrared optical systems compared to the current state-of-the-art imaging systems, especially those approaching the long-wavelength and very-long-wavelength infrared.</s0>
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