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Research Publication Search Results (87)
Venkatasubramanian, R. (2013)
Carrier concentration modulation by hot pressing pressure in n-type nanostructured Bi(Se)Te alloy
Applied Physics Letters, 103 (14):Article No. 144106.
Venkatasubramanian, R. (2013)
Origin of coherent phonons in Bi2Te3 excited by ultrafast laser pulses
Physical Review B, Condensed Matter and Materials Physics, 88 (6):064307.
Venkatasubramanian, R. (2013)
Controlled improvement in specific contact resistivity for thermoelectric materials by ion implantation
Applied Physics Letters, 103 (4):043902.
Venkatasubramanian, R. (2013)
Atomic scale structure and chemistry of Bi2Te3/GaAs interfaces grown by metallorganic van der Waals epitaxy
Applied Physics Letters, 102 (8):081601.
Venkatasubramanian, R. (2012)
Topological insulator Bi2Te3 films synthesized by metal organic chemical vapor deposition
Applied Physics Letters, 101 (16):162104-1-162104-4.
Venkatasubramanian, R. (2012)
Thin-film superlattice thermoelectric devices for energy harvesting and thermal management
In Thermoelectrics and its Energy Harvesting: Modules, Systems, and Applications in Thermoelectrics (pp. 21-1-21-18). Boca Raton, FL: CRC Press.
Venkatasubramanian, R. (2012)
Metallorganic chemical vapor deposition of InAs/GaSb superlattices on GaAs substrates using a two-step InAs buffer layer
Thin Solid Films, 520 (6):2170-2172.
Venkatasubramanian, R. (2011)
Thin film thermoelectric devices for hot-spot thermal management in microprocessors and other electronics
U.S. Patent No. 7,997,087. Washington, DC: U.S. Patent and Trademark Office.
Venkatasubramanian, R. (2011)
Preparation of clean Bi2Te3 and Sb2Te3 thin films to determine alignment at valence band maxima
Journal of Vacuum Science & Technology A, 29 (3):Art. No. 031403.
Venkatasubramanian, R. (Ed.) (2011).
Energy Harvesting - Recent Advances in Materials, Devices and Applications: MRS Symposium Proceedings, Volume1325, 2011 MRS Spring Meeting.
Cambridge University Press.
Venkatasubramanian, R. (2011)
Analysis of Ce- and Yb-Doped TAGS-85 Materials with Enhanced Thermoelectric Figure of Merit
Advanced Functional Materials, 21 (3):441-447.
Venkatasubramanian, R. (2010)
Trans-thermoelectric device
U.S. Patent No. 7,838,760. Washington, DC: U.S. Patent and Trademark Office.
Venkatasubramanian, R. (2010)
Acoustic phonon scattering in Bi2Te3/Sb2Te3 superlattices
Applied Physics Letters, 97 (8):Article Number: 083103.
Venkatasubramanian, R. (2010)
DC-DC converter for low voltage power source
U.S. Patent No. 7,706,152. Washington, DC: U.S. Patent and Trademark Office.
Venkatasubramanian, R. (2010)
Thin-film superlattice thermoelectric materials and device technologies for energy harvesting applications: Presented at the Energy Harvesting and Storage: Materials, Devices, and Applications conference, Orlando, FL. April 5,,
Proceedings of SPIE, 7683 :76830W.
Venkatasubramanian, R. (2010)
Si/Ge nanodot superlattices for Si-based photovoltaics: Concord, NC. March 18,,
Proceedings of the IEEE SouthestCon 2010 (SoutheastCon), :404-407.
Venkatasubramanian, R. (2010)
Methods of forming thermoelectric devices using islands of thermoelectric material and related structures
U.S. Patent No. 7,679,203. Washington, DC: U.S. Patent and Trademark Office.
Venkatasubramanian, R. (2010)
Applied physics: Nanothermal trumpets
Nature, 463 (7281):619-619.
Venkatasubramanian, R. (2010)
Analysis of SiGe/Si quantum dot superlattices grown by low-pressure chemical vapor deposition for thin solar cells
Thin Solid Films, 518 (6, Suppl. 1):S76-S79.
Venkatasubramanian, R. (2009)
Thermoelectric generators for solar conversion and related systems and methods
U.S. Patent No. 7,638,705. Washington, DC: U.S. Patent and Trademark Office.
Venkatasubramanian, R. (2009)
Three-stage thin-Film superlattice thermoelectric multistage microcoolers with a delta T (max) of 102 K
Journal of Electronic Materials, 38 (7):1510-1515.
Venkatasubramanian, R. (2009)
Development of low dark current SiGe-detector arrays for visible-NIR imaging sensor: Presented at Infrared Technology and Applications XXXV Conference, Orlando, FL, April 13, 2009.,
Proceedings of SPIE, 7298 (72983D).
Venkatasubramanian, R. (2009)
Thin film thermoelectric devices for hot-spot thermal management in microprocessors and other electronics
U.S. Patent No. 7,523,617. Washington, DC: U.S. Patent and Trademark Office.
Venkatasubramanian, R. (2009)
On-chip cooling by superlattice-based thin-film thermoelectrics
Nature Nanotechnology, 4 (4):235-238.
Venkatasubramanian, R. (2009)
Round-robin measurements of two candidate materials for a Seebeck coefficient Standard Reference Material
Applied Physics A: Materials Science & Processing , 94 (2):231-234.
Venkatasubramanian, R. (2009)
Statistical analysis of a round-robin measurement survey of two candidate materials for a Seebeck coefficient standard reference material
Journal of Research of the National Institute of Standards and Technology, 114 (1):37-55.
Venkatasubramanian, R. (2008)
Thermal challenges in next-generation electronic systems
IEEE Transactions on Components and Packaging Technologies, 31 (4):801-815.
Venkatasubramanian, R. (2008)
Reduction in coherent phonon lifetime in Bi2Te3/Sb2Te3 superlattices
Applied Physics Letters, 93 (11):113114.
Venkatasubramanian, R. (2008)
Development of wafer-scale cooling/heating thermoelectric arrays using thin-film superlattice devices: Proceedings ICT '02. Twenty-First International Conference on Thermoelectrics, 25-29 Aug 2002.
Venkatasubramanian, R. (2008)
Effects of high figure of merit Bi2Te3 based superlattices on thermoelectric power generation: ASME 2008 2nd International Conference on Energy Sustainability collocated with the Heat Transfer, Fluids Engineering, and 3rd Energy Nanotechnology Conferences (ES2008) August 10–14, 2008 , Jacksonville, FL. Paper no. ES2008-54062.
Venkatasubramanian, R. (2008)
Phonon-blocking, electron-transmitting low-dimensional structures
U.S. Patent No. 7,342,169. Washington, DC: U.S. Patent and Trademark Office.
Venkatasubramanian, R. (2008)
Effect of nanodot areal density and period on thermal conductivity in SiGe/Si nanodot superlattices
Applied Physics Letters, 92 (5):053112.
Venkatasubramanian, R. (2008)
Ultrafast dynamics of photoexcited coherent phonon in Bi2Te3 thin films
Applied Physics Letters, 92 (1):011108.
Venkatasubramanian, R. (2007)
Energy harvesting for electronics with thermoelectric devices using nanoscale materials: International Electron Devices Meeting, 2007. IEDM 2007. IEEE International, Washington, DC.
Venkatasubramanian, R. (2007)
Spontaneous emission enhanced heat transport method and structures for cooling, sensing, and power generation
U.S. Patent No. 7,282,798. Washington, DC: U.S. Patent and Trademark Office.
Venkatasubramanian, R. (2007)
Thermoelectric devices utilizing double-sided Peltier junctions and methods of making the devices
U.S. Patent No. 723,735. Washington, DC: U.S. Patent and Trademark Office.
Venkatasubramanian, R. (2007)
High-speed nano-optical photodetector for free space communication,
Proceedings of SPIE, 6556 (65560H).
Venkatasubramanian, R. (2007)
Assessment of micro-components for energy harvesting from thermal gradients, light, and mechanical vibrations: Proceedings of 2007 GOMACTech-07, Government Microcircuit Applications and Critical Technology Conference, Lake Buena Vista, FL.
Venkatasubramanian, R. (2007)
Si/Ge superlattice structures for thermoelectric power generation: 2007 APS March Meeting, Denver, CO, March 6, 2007. Abstract: H43.00008,
Bulletin of the American Physical Society, 52 (1).
Venkatasubramanian, R. (2007)
Thermal conductivity minima in superlattices and localization-like phenomena: 2007 APS March Meeting, Denver, CO, March 6, 2007. Abstract H43.00007,
Bulletin of the American Physical Society, 52 (1).
Venkatasubramanian, R. (2007)
Thin-film thermoelectric cooling and heating devices for DNA genomic and proteomic chips, thermo-optical switching circuits, and IR tags
U.S. Patent No. 7,164,077. Washington, DC: U.S. Patent and Trademark Office.
Venkatasubramanian, R. (2006)
Microscale thermoelectric devices for energy harvesting and thermal management
Presented at PowerMEMS 2006: The 6th International Workshop on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, Nov. 29 - Dec. 1, 2006, Berkeley, CA, 2006.
Venkatasubramanian, R. (2006)
Microscale thermoelectric devices for energy harvesting and thermal management: The Sixth International Workshop on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, Nov. 29 - Dec. 1, 2006, Berkeley, U.S.A.,
Proceedings of PowerMEMS 2006, :1-4.
Venkatasubramanian, R. (2006)
Large external Delta T and cooling power densities in thin-film Bi2Te3-superlattice thermoelectric cooling devices
Applied Physics Letters, 89 (12):122117.
Venkatasubramanian, R. (2006)
Aspects of thin-film superlattice thermoelectric materials, devices, and applications
MRS Bulletin, 31 :211-217.
Venkatasubramanian, R. (2005)
Superlattice thermoelectrics for thermal management of electronics and optoelectronics: Proceedings of the InterPack 2005, ASME InterPack Conference, San Francisco, CA.
Venkatasubramanian, R. (2005)
Enhanced thermoelectric performance in PbTe-based superlattice structures from reduction of lattice thermal conductivity
Applied Physics Letters, 87 (023105).
Venkatasubramanian, R. (2005)
Nanostructured superlattice thin-film thermoelectric devices
In Nanotechnology and the Environment: Applications and Implications, ACS Symposium Series No. 890 . : American Chemical Society.
Venkatasubramanian, R. (2005)
Superlattice thin-film thermoelectric material and device technologies
In Thermoelectrics Handbook: Macro to Nano . Boca Raton, FL: CRC Press.
Venkatasubramanian, R. (2004)
Cascade cryogenic thermoelectric cooler for cryogenic and room temperature applications
U.S. Patent No. 6,722,140. Washington, DC: U.S. Patent and Trademark Office.
Venkatasubramanian, R. (2004)
Nanoscale materials for thermoelectrics, thermo-photonics and hybrid energy systems - Toward green energy solutions
Abstracts of Papers of the American Chemical Society, 227 :U1240-U1241.
Venkatasubramanian, R. (2003)
Cascade cryogenic thermoelectric cooler for cryogenic and room temperature applications
U.S. Patent No. 6,662,570. Washington, DC: U.S. Patent and Trademark Office.
Venkatasubramanian, R. (2003)
Cascade cryogenic thermoelectric cooler for cryogenic and room temperature applications
U.S. Patent No. 6,505,468. Washington, DC: U.S. Patent and Trademark Office.
Venkatasubramanian, R. (2003)
Thin-film superlattice thermoelectric devices
Abstracts of Papers of the American Chemical Society, 225 :U987-U987.
Venkatasubramanian, R. (2001)
Thin-film thermoelectric device and fabrication method of same
U.S. Patent No. 6,300,150. Washington, DC: U.S. Patent and Trademark Office.
Venkatasubramanian, R. (2001)
Thin-film thermoelectric devices with high room-temperature figures of merit
Nature, 413 (6856):597-602.
Venkatasubramanian, R. (2001)
In-situ monitoring of the growth of Bi2Te3 and Sb2Te3 films and Bi2Te3-Sb2Te3 superlattice using spectroscopic ellipsometry
Journal of Electronic Materials, 30 (11):1376-1381.
Venkatasubramanian, R. (2001)
Phonon blocking electron transmitting superlattice structures as advanced thin film thermoelectric materials
In Recent Trends In Thermoelectric Materials Research III: Semiconductors and Semimetals, Volume 71 (pp. 175-201). San Diego, CA: Academic Press.
Venkatasubramanian, R. (2001)
Thermal characterization of Bi2Te3/Sb2Te3 superlattices
Journal of Applied Physics, 90 (2):763-767.
Venkatasubramanian, R. (2000)
Low temperature chemical vapor deposition and etching apparatus and method
U.S. Patent No. 6,071,351. Washington, DC: U.S. Patent and Trademark Office.
Venkatasubramanian, R. (2000)
Lattice thermal conductivity reduction and phonon localizationlike behavior in superlattice structures
Physical Review B, Condensed Matter and Materials Physics, 61 (4):3091-3097.
Venkatasubramanian, R. (1999)
Low-temperature organometallic epitaxy and its application to superlattice structures in thermoelectrics
Applied Physics Letters, 75 (8):1104-1106.
Venkatasubramanian, R. (1999)
Optical constants of Bi2Te3 and Sb2Te3 measured using spectroscopic ellipsometry
Journal of Electronic Materials, 28 (10):1111-1114.
Venkatasubramanian, R. (1997)
20% (AM1.5) efficiency GaAs solar cells on sub-mm grain-size poly-Ge and its transition to low-cost substrates: Twenty Sixth IEEE Photovoltaic Specialists Conference, Anaheim, CA, 29 September - 03 October 1997.
Venkatasubramanian, R. (1997)
MOCVD of Bi2Te3, Sb2Te3 and their superlattice structures for thin-film thermoelectric applications
Journal of Crystal Growth, 170 (1-4):817-821.
Venkatasubramanian, R. (1997)
Thermal conductivity of Si-Ge superlattices
Applied Physics Letters, 70 (22):2957-2959.
Venkatasubramanian, R. (1996)
18.2% (AM1.5) Efficient GaAs Solar Cell on Optical Grade Polycrystalline Ge Substrate: 25th IEEE Photovoltaic Specialists Conference.
Venkatasubramanian, R. (1996)
Experimental Evidence of High Power Factors and Low Thermal Conductivity in Bi2Te3/Sb2Te3 Superlattice Thin-Films: 15th International Conference on Thermoelectrics.
Venkatasubramanian, R. (1996)
MOCVD of Bi2Te3, Sb2Te3 and Their Superlattice Structures for Thin-Film Thermoelectric Application
Journal of Crystal Growth, :5487.
Venkatasubramanian, R. (1994)
Close-packed cell arrays for dish concentrators: IEEE First World Conference on Photovoltaic Energy Conversion, conference record of the Twenty Fourth IEEE Photovoltaic Specialists Conference - 1994 : Waikoloa, Hawaii, December 5-9, 1994..
Venkatasubramanian, R. (1994)
GaAs and Al0.2Ga0.8As solar cells with an indirect-bandgap Al0.8Ga0.2As emitter-heterojunction cells: IEEE First World Conference on Photovoltaic Energy Conversion, conference record of the Twenty Fourth IEEE Photovoltaic Specialists Conference - 1994 : Waikoloa, Hawaii, December 5-9, 1994.
Venkatasubramanian, R. (1994)
Optoelectronic properties of eutectic-metal-bonded (EMB) GaAs-AlGaAs structures on Si substrates
Solid-State Electronics, 37 (11):1809-1815.
Venkatasubramanian, R. (1994)
High-efficiency tandem solar cells on single- and poly-crystalline substrates
Solar Energy Materials and Solar Cells, 35 :9-24.
Venkatasubramanian, R. (1993)
Development of high-efficiency Al0.2Ga0.8As solar cells and interconnect schemes for Al0.2Ga0.8As/Si mechanically-stacked cascade cells: Twenty Third IEEE Photovoltaic Specialists Conference--1993, Louisville, KY, May 10-14, 1993.
Venkatasubramanian, R. (1992)
Properties and use of cycled grown OMVPE GaAs:Zn, GaAs:Se, and GaAs:Si layers for high-conductance GaAs tunnel junctions
Journal of Electronic Materials, 21 (9):893-899.
Venkatasubramanian, R. (1992)
High-quality eutectic-metal-bonded AlGaAs-GaAs thin films on Si substrates
Applied Physics Letters, 60 (7):886-888.
Venkatasubramanian, R. (1992)
Photoluminescence of porous silicon buried underneath epitaxial GaP
Applied Physics Letters, 60 (7):889-891.
Venkatasubramanian, R. (1991)
Physical basis and characteristics of light emission from quantizedplanar Ge structures: International Electron Devices Meeting, 1991. IEDM '91, Washington, DC, Technical Digest.
Venkatasubramanian, R. (1991)
Selective plasma etching of Ge substrates for thin freestanding GaAs-AlGaAs heterostructures
Applied Physics Letters, 59 (17):2153-2155.
Venkatasubramanian, R. (1991)
Visible light emission from quantized planar Ge structures
Applied Physics Letters, 59 (13):1603-1605.
Venkatasubramanian, R. (1991)
Ideal electronic properties of a p-Ge/p-Al0.85Ga0.15As interface
Applied Physics Letters, 59 (3):318-320.
Venkatasubramanian, R. (1991)
Heteroepitaxy and characterization of Ge-rich SiGe alloys on GaAs
Journal of Applied Physics, 69 (12):8164-8167.
Venkatasubramanian, R. (1991)
Optimization of the heteroepitaxy of Ge on GaAs for minority-carrier lifetime
Journal of Crystal Growth, 112 (1):7-13.
Venkatasubramanian, R. (1991)
High quality GaAs on Si using Si0.04Ge0.96/Ge buffer layers
Journal of Crystal Growth, 107 (1-4):489-493.
Venkatasubramanian, R. (1990)
Radiative recombination in surface-free n+/n?/n+GaAs homostructures
Applied Physics Letters, 57 (15):1572-1574.
Venkatasubramanian, R. (1990)
Photoexcited carrier lifetimes and spatial transport in surface-free GaAs homostructures
Journal of Vacuum Science & Technology B, 8 (4):787-792.
Venkatasubramanian, R. (1990)
Measurement of AlGaAs/AlGaAs interface recombination velocities using time-resolved photoluminescence
Applied Physics Letters, 56 (19):1850-1852.