Matthew C Beard

Summary

Affiliation: National Renewable Energy Laboratory
Country: USA

Publications

  1. ncbi request reprint Multiple exciton generation in colloidal silicon nanocrystals
    Matthew C Beard
    National Renewable Energy Laboratory, Golden, Colorado 80401, USA matt_
    Nano Lett 7:2506-12. 2007
  2. doi request reprint Structural, optical, and electrical properties of self-assembled films of PbSe nanocrystals treated with 1,2-ethanedithiol
    Joseph M Luther
    National Renewable Energy Laboratory, Golden, Colorado 80401, USA
    ACS Nano 2:271-80. 2008
  3. ncbi request reprint Multiple exciton generation in films of electronically coupled PbSe quantum dots
    Joseph M Luther
    Chemical and Biosciences Center, National Renewable Energy Laboratory, Golden, Colorado 80401, USA
    Nano Lett 7:1779-84. 2007
  4. doi request reprint Transparent conductive single-walled carbon nanotube networks with precisely tunable ratios of semiconducting and metallic nanotubes
    Jeffrey L Blackburn
    National Renewable Energy Laboratory, Golden, Colorado 80401, USA
    ACS Nano 2:1266-74. 2008
  5. doi request reprint The subtle chemistry of colloidal, quantum-confined semiconductor nanostructures
    Barbara K Hughes
    Chemical and Material Sciences, National Renewable Energy Laboratory, Golden, Colorado 80401, USA
    ACS Nano 6:4573-9. 2012
  6. ncbi request reprint Time-resolved photoconductivity of PbSe nanocrystal arrays
    James E Murphy
    Chemical and Biosciences Center, National Renewable Energy Laboratory, Golden, Colorado, 80401, USA
    J Phys Chem B 110:25455-61. 2006
  7. doi request reprint Coherent exciton delocalization in strongly coupled quantum dot arrays
    Ryan W Crisp
    National Renewable Energy Laboratory, 15013 Denver West Pkwy, Golden, Colorado 80401, United States
    Nano Lett 13:4862-9. 2013
  8. ncbi request reprint PbTe colloidal nanocrystals: synthesis, characterization, and multiple exciton generation
    James E Murphy
    Center for Basic Sciences, National Renewable Energy Laboratory, Golden, Colorado 80401, USA
    J Am Chem Soc 128:3241-7. 2006
  9. doi request reprint Revisiting the Valence and Conduction Band Size Dependence of PbS Quantum Dot Thin Films
    Elisa M Miller
    Chemical and Materials Sciences Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
    ACS Nano 10:3302-11. 2016
  10. ncbi request reprint Synthesis and spectroscopy of PbSe fused quantum-dot dimers
    Barbara K Hughes
    National Renewable Energy Laboratory, Chemical and Material Sciences Center, Golden, Colorado 80401, United States
    J Am Chem Soc 136:4670-9. 2014

Collaborators

  • Joseph M Luther
  • Randy J Ellingson
  • Justin C Johnson
  • Ye Yang
  • Pingrong Yu
  • Jeffrey L Blackburn
  • Qing Song
  • Victor I Klimov
  • Dmitri V Talapin
  • Sohee Jeong
  • Zhen Li
  • Teresa M Barnes
  • Danielle K Smith
  • Arthur J Nozik
  • Jianbo Gao
  • Ryan W Crisp
  • Elisa M Miller
  • Jianbing Zhang
  • Nathan R Neale
  • Barbara K Hughes
  • Octavi E Semonin
  • Ashley R Marshall
  • Daniel M Kroupa
  • James E Murphy
  • Benjamin G Lee
  • Lance M Wheeler
  • Matthew R Bergren
  • Peter K B Palomaki
  • Sungwoo Kim
  • Jao van de Lagemaat
  • D M Sagar
  • Craig L Perkins
  • Aaron G Midgett
  • Hsiang Yu Chen
  • Mark C Hanna
  • Sukgeun Choi
  • Matt Law
  • Gregory F Pach
  • Ryan M France
  • J Matthew Kurley
  • Sanjini U Nanayakkara
  • Matthew O Reese
  • Bradley A Macleod
  • Margit Zacharias
  • Alex Zunger
  • Thomas E Furtak
  • Asa W Nichols
  • Stephan Lany
  • Paul Stradins
  • Nicholas C Anderson
  • Daniel Hiller
  • Philip Schulz
  • Boris D Chernomordik
  • Antoine Kahn
  • Jun Wei Luo
  • Joanna M Atkin
  • Markus B Raschke
  • Andrew Shabaev
  • Carena P Church
  • Daniel Kroupa
  • Alexander L Efros
  • Steven C Erwin
  • Joel N Schrauben
  • John T Stewart
  • Lazaro A Padilha
  • S Phillip Ahrenkiel
  • Olga I Micic
  • Andrew G Norman

Detail Information

Publications35

  1. ncbi request reprint Multiple exciton generation in colloidal silicon nanocrystals
    Matthew C Beard
    National Renewable Energy Laboratory, Golden, Colorado 80401, USA matt_
    Nano Lett 7:2506-12. 2007
    ....
  2. doi request reprint Structural, optical, and electrical properties of self-assembled films of PbSe nanocrystals treated with 1,2-ethanedithiol
    Joseph M Luther
    National Renewable Energy Laboratory, Golden, Colorado 80401, USA
    ACS Nano 2:271-80. 2008
    ..The LbL process described here is a general strategy for producing uniform, conductive nanocrystal films for applications in optoelectronics and solar energy conversion...
  3. ncbi request reprint Multiple exciton generation in films of electronically coupled PbSe quantum dots
    Joseph M Luther
    Chemical and Biosciences Center, National Renewable Energy Laboratory, Golden, Colorado 80401, USA
    Nano Lett 7:1779-84. 2007
    ..We compare the absorption cross sections of our samples to that of bulk PbSe. We find that both the biexciton lifetime and the absorption cross section increase in films relative to isolated QDs in solution...
  4. doi request reprint Transparent conductive single-walled carbon nanotube networks with precisely tunable ratios of semiconducting and metallic nanotubes
    Jeffrey L Blackburn
    National Renewable Energy Laboratory, Golden, Colorado 80401, USA
    ACS Nano 2:1266-74. 2008
    ..As a result, redox-doped semiconductor-enriched films are more conductive than either intrinsic or redox-doped metal-enriched films...
  5. doi request reprint The subtle chemistry of colloidal, quantum-confined semiconductor nanostructures
    Barbara K Hughes
    Chemical and Material Sciences, National Renewable Energy Laboratory, Golden, Colorado 80401, USA
    ACS Nano 6:4573-9. 2012
    ..In this Perspective, we discuss current efforts toward better understanding how the reactivity of the reagents can be used to produce unique and complex nanostructures...
  6. ncbi request reprint Time-resolved photoconductivity of PbSe nanocrystal arrays
    James E Murphy
    Chemical and Biosciences Center, National Renewable Energy Laboratory, Golden, Colorado, 80401, USA
    J Phys Chem B 110:25455-61. 2006
    ..In addition, the arrays were treated with NaOH. We find that the treatments affect both the degree of electronic coupling and the carrier dynamics...
  7. doi request reprint Coherent exciton delocalization in strongly coupled quantum dot arrays
    Ryan W Crisp
    National Renewable Energy Laboratory, 15013 Denver West Pkwy, Golden, Colorado 80401, United States
    Nano Lett 13:4862-9. 2013
    ..By comparing the CPTG decays with those of isolated QDs, we find that excitons coherently delocalize to form excited states more than 200% larger than the QD diameter. ..
  8. ncbi request reprint PbTe colloidal nanocrystals: synthesis, characterization, and multiple exciton generation
    James E Murphy
    Center for Basic Sciences, National Renewable Energy Laboratory, Golden, Colorado 80401, USA
    J Am Chem Soc 128:3241-7. 2006
    ..This is followed by a comparison of the differences in the electronic band structure and optical properties of these lead salts...
  9. doi request reprint Revisiting the Valence and Conduction Band Size Dependence of PbS Quantum Dot Thin Films
    Elisa M Miller
    Chemical and Materials Sciences Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
    ACS Nano 10:3302-11. 2016
    ..In addition, we use inverse photoelectron spectroscopy to measure the conduction band region, which has similar challenges in the analysis of PbS QD films due to a low density of states near the conduction band minimum. ..
  10. ncbi request reprint Synthesis and spectroscopy of PbSe fused quantum-dot dimers
    Barbara K Hughes
    National Renewable Energy Laboratory, Chemical and Material Sciences Center, Golden, Colorado 80401, United States
    J Am Chem Soc 136:4670-9. 2014
    ..We also demonstrate the possibility of fusing two QDs with different sizes into a heterostructure. ..
  11. doi request reprint n-Type transition metal oxide as a hole extraction layer in PbS quantum dot solar cells
    Jianbo Gao
    National Renewable Energy Laboratory, Golden, Colorado, United States
    Nano Lett 11:3263-6. 2011
    ..The carrier transport to the metal anode is likely enhanced through shallow gap states in the MoO(x) layer...
  12. doi request reprint Tuning the synthesis of ternary lead chalcogenide quantum dots by balancing precursor reactivity
    Danielle K Smith
    Center for Advanced Solar Photophysics, Chemical and Materials Sciences, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
    ACS Nano 5:183-90. 2011
    ..A more reactive anion precursor results in a lower Pb/anion ratio...
  13. doi request reprint Variations in the quantum efficiency of multiple exciton generation for a series of chemically treated PbSe nanocrystal films
    Matthew C Beard
    Basic Sciences Center, National Renewable Energy Laboratory, Golden, Colorado 80401, USA
    Nano Lett 9:836-45. 2009
    ....
  14. doi request reprint Comparing multiple exciton generation in quantum dots to impact ionization in bulk semiconductors: implications for enhancement of solar energy conversion
    Matthew C Beard
    Basic Sciences Center, National Renewable Energy Laboratory, Golden, Colorado 80401, USA
    Nano Lett 10:3019-27. 2010
    ..Finally, we discuss the research challenges associated with achieving the maximum benefit of MEG in solar energy conversion since we show the threshold and efficiency are mathematically related...
  15. doi request reprint Determining the internal quantum efficiency of PbSe nanocrystal solar cells with the aid of an optical model
    Matt Law
    National Renewable Energy Laboratory, Golden, Colorado 80401, USA
    Nano Lett 8:3904-10. 2008
    ..On the basis of the magnitudes and shapes of the IQE spectra, we conclude that the 1,2-ethanedithiol treated NC devices studied here do not produce appreciable MEG photocurrent...
  16. pmc Large polarization-dependent exciton optical Stark effect in lead iodide perovskites
    Ye Yang
    Chemistry and Nanoscience Center, National Renewable Energy Laboratory, Golden, Colorado 80401, USA
    Nat Commun 7:12613. 2016
    ..Such selective spin manipulation is an important prerequisite for spintronic applications. Our result implies that such hybrid semiconductors may have great potential for optoelectronic applications beyond photovoltaics. ..
  17. ncbi request reprint Peak external photocurrent quantum efficiency exceeding 100% via MEG in a quantum dot solar cell
    Octavi E Semonin
    National Renewable Energy Laboratory, Golden, CO 80401, USA
    Science 334:1530-3. 2011
    ....
  18. doi request reprint Air-Stable and Efficient PbSe Quantum-Dot Solar Cells Based upon ZnSe to PbSe Cation-Exchanged Quantum Dots
    Sungwoo Kim
    National Renewable Energy Laboratory, Golden, Colorado 80401, United States
    ACS Nano 9:8157-64. 2015
    ..The solar cell performance without encapsulation remains unchanged for over 50 days in ambient conditions; and after 50 days, the National Renewable Energy Laboratory certification team certified the device at 5.9%. ..
  19. doi request reprint Metal Halide Solid-State Surface Treatment for High Efficiency PbS and PbSe QD Solar Cells
    Ryan W Crisp
    1 National Renewable Energy Laboratory, Golden, CO 80401 USA 2 Department of Physics, Colorado School of Mines, Golden, CO 80401 USA
    Sci Rep 5:9945. 2015
    ..We demonstrate QD solar cells based on PbI2 with power conversion efficiencies above 7%. ..
  20. doi request reprint Size and composition dependent multiple exciton generation efficiency in PbS, PbSe, and PbS(x)Se(1-x) alloyed quantum dots
    Aaron G Midgett
    National Renewable Energy Laboratory, Golden, Colorado 80401, United States
    Nano Lett 13:3078-85. 2013
    ..Our results suggest that MEG increases with quantum confinement, and we discuss the interplay between a size-dependent MEG rate versus hot exciton cooling. ..
  21. ncbi request reprint Quantum Dot Size Dependent J-V Characteristics in Heterojunction ZnO/PbS Quantum Dot Solar Cells
    Jianbo Gao
    Chemical and Material Sciences Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
    Nano Lett 11:1002-8. 2011
    ..Finally, we present Kelvin probe measurements to determine the Fermi level of the QD layers and discuss band alignment, Fermi-level pinning, and the V(oc) within these devices...
  22. doi request reprint Photogenerated free carrier dynamics in metal and semiconductor single-walled carbon nanotube films
    Matthew C Beard
    National Renewable Energy Laboratory, Golden, Colorado 80401, USA
    Nano Lett 8:4238-42. 2008
    ..Free-carriers are generated by a linear exciton dissociation process that occurs within -1 ps and is independent of excitation wavelength or tube type...
  23. ncbi request reprint Absorption cross-section and related optical properties of colloidal InAs quantum dots
    Pingrong Yu
    Center for Basic Sciences, National Renewable Energy Laboratory, Golden, Colorado 80401, USA
    J Phys Chem B 109:7084-7. 2005
    ..The radiative lifetime of the first exciton calculated from the oscillator strength increases with dot size and ranges from 4 ns for the smallest dots to 14 ns for the largest ones...
  24. doi request reprint Comparison of Recombination Dynamics in CH3NH3PbBr3 and CH3NH3PbI3 Perovskite Films: Influence of Exciton Binding Energy
    Ye Yang
    Chemistry and Nanoscience Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
    J Phys Chem Lett 6:4688-92. 2015
    ..The increased Auger recombination rate, which is enhanced by Coulomb interactions, can be ascribed to the larger exciton binding energy, ∼40 meV, in CH3NH3PbBr3 compared with ∼13 meV in CH3NH3PbI3. ..
  25. doi request reprint Semiconductor interfacial carrier dynamics via photoinduced electric fields
    Ye Yang
    National Renewable Energy Laboratory, Chemistry and Nanoscience Center, Golden, CO, 80401, USA
    Science 350:1061-5. 2015
    ..Additionally, the charge recombination rate at the p-GaInP2/TiO2 interface is greatly reduced owing to its p-n nature, compared with the Schottky nature of the p-GaInP2/Pt interface. ..
  26. doi request reprint Quantum confined electron-phonon interaction in silicon nanocrystals
    D M Sagar
    Chemistry and Nanoscience Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
    Nano Lett 15:1511-6. 2015
    ..Our results have important implications for potentially controlling carrier energy relaxation channels in strongly confined Si nanocrystals. ..
  27. doi request reprint Charge generation in PbS quantum dot solar cells characterized by temperature-dependent steady-state photoluminescence
    Jianbo Gao
    Center for Advanced Solar Photophysics, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
    ACS Nano 8:12814-25. 2014
    ....
  28. doi request reprint PbSe quantum dot solar cells with more than 6% efficiency fabricated in ambient atmosphere
    Jianbing Zhang
    Center for Advanced Solar Photophysics, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
    Nano Lett 14:6010-5. 2014
    ..Using these QDs, we fabricate high-performance solar cells without any protection and demonstrate a power conversion efficiency exceeding 6%, which is a current record for PbSe QD solar cells. ..
  29. doi request reprint Third generation photovoltaics based on multiple exciton generation in quantum confined semiconductors
    Matthew C Beard
    National Renewable Energy Laboratory, Golden, Colorado 80401, United States
    Acc Chem Res 46:1252-60. 2013
    ..Further challenges include increasing the MEG efficiency and improving the QD device structure and operation...
  30. ncbi request reprint Highly efficient multiple exciton generation in colloidal PbSe and PbS quantum dots
    Randy J Ellingson
    Center for Basic Sciences, National Renewable Energy Laborarory, Golden, Colorado 80401, USA
    Nano Lett 5:865-71. 2005
    ..We present experimental and theoretical values of the size-dependent interband transition energies for PbSe QDs, and we also introduce a new model for MEG based on the coherent superposition of multiple excitonic states...
  31. doi request reprint Tandem Solar Cells from Solution-Processed CdTe and PbS Quantum Dots Using a ZnTe-ZnO Tunnel Junction
    Ryan W Crisp
    National Renewable Energy Laboratory, Golden, Colorado 80401, United States
    Nano Lett . 2017
    ..1 V with matched short circuit current density of 10 mA/cm2 in prototype devices...
  32. doi request reprint Size-Dependent Exciton Formation Dynamics in Colloidal Silicon Quantum Dots
    Matthew R Bergren
    National Renewable Energy Laboratory, Golden, Colorado 80401, United States
    ACS Nano 10:2316-23. 2016
    ..These results experimentally verify the modification of hot-carrier relaxation rates by quantum confinement in Si QDs, which likely plays a significant role in the high carrier multiplication efficiency observed in these nanomaterials. ..
  33. pmc Low surface recombination velocity in solution-grown CH3NH3PbBr3 perovskite single crystal
    Ye Yang
    National Renewable Energy Laboratory NREL, Golden, Colorado 80401, USA
    Nat Commun 6:7961. 2015
    ..Our result suggests that the planar grain size for the perovskite thin films should be larger than ∼30 μm to avoid the influence of surface recombination on the effective carrier lifetime. ..
  34. doi request reprint All-Inorganic Germanium Nanocrystal Films by Cationic Ligand Exchange
    Lance M Wheeler
    Chemistry and Nanoscience Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
    Nano Lett 16:1949-54. 2016
    ..This new ligand chemistry should accelerate progress in utilizing germanium and other group IV nanocrystals for optoelectronic applications. ..
  35. doi request reprint Quasi-Direct Optical Transitions in Silicon Nanocrystals with Intensity Exceeding the Bulk
    Benjamin G Lee
    National Renewable Energy Laboratory, Golden, Colorado 80401, United States
    Nano Lett 16:1583-9. 2016
    ..This observation and its theoretical understanding could lead to engineering of Si and other indirect band gap NC materials for optical and optoelectronic applications...