Papers

2021

Stabilizing Highly Dispersed Halo Sites in Thermally Restructured Palladium Core@Shell Nanoparticles for Improved Catalyst Activity and Durability

Alexander J. Hill, Adarsh Bhat, Zachary J. Berquist, Galen B. Fisher, Andrej Lenert*, and Johannes W. Schwank*, ACS Applied Nano Materials, 2021

Identifies the criteria needed to form and stabilize highly dispersed catalytic sites, known as halo sites, in core@shell structures.

Tunable Atomic Layer Deposition into Ultra-High-Aspect-Ratio (>60000:1) Aerogel Monoliths Enabled by Transport Modeling

Andrew J. Gayle, Zachary J. Berquist, Yuxin Chen, Alexander J. Hill, Jacob Y. Hoffman, Ashley R. Bielinski, Andrej Lenert*, and Neil P. Dasgupta*, Chemistry of Materials, 2021

Demonstrates tunable control of the ALD infiltration depth into an aerogel monolith and provides a predictive model that enables process design and optimization.

2020

Air bridge

Near-Perfect Photon Utilization in an Air-Bridge Thermophotovoltaic Cell

Dejiu Fan*, Tobias Burger*, Sean McSherry, Byungjun Lee, Andrej Lenert*, Stephen R. Forrest*, Nature, 2020

Demonstrates incorporation of an air cavity into a thin-film InGaAs cell enabling ~99% reflectance and record-high TPV power conversion efficiency (32%). This work has been highlighted by Chemical & Engineering News and PV magazine.

Plasmon-Enhanced Greenhouse Selectivity for High-Temperature Solar Thermal Energy Conversion

Plasmon-Enhanced Greenhouse Selectivity for High-Temperature Solar Thermal Energy Conversion

Zachary J. Berquist, Kevin K. Turaczy, Andrej Lenert, ACS Nano, 2020

Demonstrates plasmonic suppression of reradiation losses in a solar-transparent insulator for use in next-generation solar thermal receivers.

Selectively Enhancing Solar Scattering for Direct Radiative Cooling through Control of Polymer Nanofiber Morphology

Selectively Enhancing Solar Scattering for Direct Radiative Cooling through Control of Polymer Nanofiber Morphology

Hannah Kim, Sean McSherry, Brendon Brown,  Andrej Lenert, ACS Applied Materials & Interfaces, 2020

Investigates the scattering and transmission properties of electrospun polyacrylonitrile (PAN) nanofibers with varying morphologies for passive radiative cooling. 

Present Efficiencies and Future Opportunities in Thermophotovoltaics

Present Efficiencies and Future Opportunities in Thermophotovoltaics

Tobias Burger, Caroline Sempere, Bosun Roy Layinde, Andrej Lenert, Joule, 2020

Analyzes the features and limitations of leading TPV approaches. See our Project TPV page for more details.

Extending the thermal near field through compensation in hyperbolic waveguides

Extending the thermal near field through compensation in hyperbolic waveguides

Sean McSherry, Andrej Lenert. Physical Review Applied, 2020

Investigates the use of a solid-state waveguide that is interposed between a hot and cold object to extend the separation distance at which near-field electromagnetic channels enhance heat transfer.

Thermophotovoltaic Energy Conversion: Materials and Device Engineering

Thermophotovoltaic Energy Conversion: Materials and Device Engineering

Tobias Burger, Caroline Sempere and Andrej Lenert, Nanoscale Energy Transport, 2020.

Reviews the development of thermophotovoltaic energy conversion and advancements in materials and fabrication of thermophotovoltaic devices.

Thermally Induced Restructuring of Pd@ CeO2 and Pd@ SiO2 Nanoparticles as a Strategy for Enhancing Low-Temperature Catalytic Activity

Alexander J Hill, Chang Yup Seo, Xiaoyin Chen, Adarsh Bhat, Galen B Fisher, Andrej Lenert, Johannes W Schwank, ACS Catalysis, 2020.

Investigates the formation and chemistry of active halo sites within the shell of a core@shell catalyst

2019

 

Design of thermophotovoltaics for tolerance of parasitic absorption

Design of thermophotovoltaics for tolerance of parasitic absorption

V. K. Raman, T. Burger, and A. Lenert. Optics Express, 2019.

Suggests a way to minimize the gap between lab and prototype efficiencies of TPV systems by making them more tolerant of parasitic absorption.

Journal of Photonics for Energy

 

Thermal photonics in energy

A. Lenert, Y. Zheng, S. Shen. Journal of Photonics for Energy, 2019.

Introduces the special issue and highlights recent developments in the field.

Effects of narrowband transport on near-field and far-field thermophotonic conversion

 

Effects of narrowband transport on near-field and far-field thermophotonic conversion

S. McSherry, T. Burger, and A. Lenert.  Journal of Photonics for Energy, 2019.

Looks at how near-field electroluminescence enhances the energy flux in solid-state heat engines and which heat engines benefit from near-monochromatic emission. 

2018

Thin-film architectures with high spectral selectivity for thermophotovoltaic cells

Thin-film architectures with high spectral selectivity for thermophotovoltaic cells

T. Burger, D. Fan, K. Lee, S.R. Forrest, A. Lenert. ACS Photonics, 2018.

Proposes strategies for enhancing the spectral selectivity of thin-film III-V thermophotovoltaic cells and evaluates their impact on efficiency. In collaboration with Stephen Forrest’s group.

Optical and thermal filtering nanoporous materials for sub-ambient radiative cooling

 

Optical and thermal filtering nanoporous materials for sub-ambient radiative cooling

H. Kim, A. Lenert. Journal of Optics, 2018.

Proposes a new approach for radiative cooling to low temperatures using infrared-transparent nanoporous materials, and develops a model for evaluating various structures and material compositions. *special issue on new materials for nanophotonics

Radiative thermal runaway due to negative differential thermal emission across a solid-solid phase transition

 

Optically transparent thermally insulating silica aerogels for solar thermal insulation

A.A. Gunay, H. Kim, N. Nagarajan, M. Lopez, R. Kantharaj, A. Alsaati, A. Marconnet, A. Lenert, N. Miljkovic.  ACS Applied Materials and Interfaces, 10 (15), p. 12603–12611, 2018.

Looks at the effects of hydrophobicity of transparent aerogels on solar thermal energy conversion.

Optically transparent thermally insulating silica aerogels for solar thermal insulation

 

Effects of narrowband transport on near-field and far-field thermophotonic conversion

S. McSherry, T. Burger, and A. Lenert.  Journal of Photonics for Energy, 2019.

Looks at how near-field electroluminescence enhances the energy flux in solid-state heat engines and which heat engines benefit from near-monochromatic emission. 

Earlier


 

Spectral splitting optimization for high-efficiency solar photovoltaic and thermal power generation.

 

Spectral splitting optimization for high-efficiency solar photovoltaic and thermal power generation.

D.M. Bierman, A. Lenert, E.N. Wang. Applied Physics Letters, 109 (24), 243904, 2016.

Temperature dependence of thermopower in molecular junctions.

 

Temperature dependence of thermopower in molecular junctions.

Y. Kim, A. Lenert, E. Meyhofer, P. Reddy.  Applied Physics Letters, 109, p. 033102, 2016. 
*Highlighted by APL: Editor’s Pick

Enhanced photovoltaic energy conversion using thermally-based spectral shaping

 

Enhanced photovoltaic energy conversion using thermally-based spectral shaping

D.M. Bierman, A. Lenert, W.R. Chan, B. Bhatia, I. Celanović, M. Soljačić, E.N. Wang.  Nature Energy, 1(6), p. 16068, 2016.
*Selected by MIT Tech Review: 10 Breakthrough Technologies of 2017The Biggest Clean Energy Advances in 2016