Alex Walker
Alex Walker
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A 19.9%-efficient ultrathin solar cell based on a 205-nm-thick GaAs absorber and a silver nanostructured back mirror
HL Chen, A Cattoni, R De Lépinau, AW Walker, O Höhn, D Lackner, ...
Nature Energy 4 (9), 761-767, 2019
Performance comparison of AlGaAs, GaAs and InGaP tunnel junctions for concentrated multijunction solar cells
JF Wheeldon, CE Valdivia, AW Walker, G Kolhatkar, A Jaouad, A Turala, ...
Progress in Photovoltaics: Research and Applications 19 (4), 442-452, 2011
Impact of photon recycling on GaAs solar cell designs
AW Walker, O Höhn, DN Micha, B Bläsi, AW Bett, F Dimroth
IEEE Journal of photovoltaics 5 (6), 1636-1645, 2015
Optimal laser wavelength for efficient laser power converter operation over temperature
O Höhn, AW Walker, AW Bett, H Helmers
Applied Physics Letters 108 (24), 2016
Nonradiative lifetime extraction using power-dependent relative photoluminescence of III-V semiconductor double-heterostructures
AW Walker, S Heckelmann, C Karcher, O Höhn, C Went, M Niemeyer, ...
Journal of Applied Physics 119 (15), 2016
Minority carrier diffusion length, lifetime and mobility in p-type GaAs and GaInAs
M Niemeyer, J Ohlmann, AW Walker, P Kleinschmidt, R Lang, ...
Journal of Applied Physics 122 (11), 2017
The effects of absorption and recombination on quantum dot multijunction solar cell efficiency
AW Walker, O Thériault, JF Wheeldon, K Hinzer
IEEE journal of photovoltaics 3 (3), 1118-1124, 2013
Tunnel-junction-limited multijunction solar cell performance over concentration
AW Walker, O Thériault, MM Wilkins, JF Wheeldon, K Hinzer
IEEE Journal of Selected Topics in Quantum Electronics 19 (5), 1-8, 2013
Enhanced efficiencies for high-concentration, multijunction PV systems by optimizing grid spacing under nonuniform illumination
P Sharma, AW Walker, JF Wheeldon, K Hinzer, H Schriemer
International Journal of Photoenergy 2014, 2014
Estimating cell temperature in a concentrating photovoltaic system
MD Yandt, JF Wheeldon, J Cook, R Beal, AW Walker, O Thériault, ...
AIP Conference Proceedings 1477 (1), 172-175, 2012
Impact of photon recycling and luminescence coupling on III–V single and dual junction photovoltaic devices
AW Walker, O Höhn, DN Micha, L Wagner, H Helmers, AW Bett, F Dimroth
Journal of Photonics for Energy 5 (1), 053087-053087, 2015
AlGaAs tunnel junction for high efficiency multi-junction solar cells: Simulation and measurement of temperature-dependent operation
JF Wheeldon, CE Valdivia, A Walker, G Kolhatkar, TJ Hall, K Hinzer, ...
2009 34th IEEE Photovoltaic Specialists Conference (PVSC), 000106-000111, 2009
Measurement of the non-radiative minority recombination lifetime and the effective radiative recombination coefficient in GaAs
M Niemeyer, P Kleinschmidt, AW Walker, LE Mundt, C Timm, R Lang, ...
AIP Advances 9 (4), 2019
The dependence of multijunction solar cell performance on the number of quantum dot layers
AW Walker, O Theriault, K Hinzer
IEEE Journal of Quantum Electronics 50 (3), 198-203, 2014
Temperature dependent external quantum efficiency simulations and experimental measurement of lattice matched quantum dot enhanced multi-junction solar cells
AW Walker, JF Wheeldon, O Thériault, MD Yandt, K Hinzer
2011 37th IEEE Photovoltaic Specialists Conference, 000564-000569, 2011
Efficiency Measurements and Simulations of GaInP/InGaAs/Ge Quantum Dot Enhanced Solar Cells at up to 1000‐Suns Under Flash and Continuous Concentration
JF Wheeldon, A Walker, CE Valdivia, S Chow, O Theriault, R Beal, ...
AIP Conference Proceedings 1407 (1), 220-223, 2011
Procedure to decouple reflectance and down-shifting effects in luminescent down-shifting enhanced photovoltaics
AM Gabr, AW Walker, MM Wilkins, R Kleiman, K Hinzer
Optics Express 25 (12), A530-A538, 2017
Heavy and light hole minority carrier transport properties in low-doped n-InGaAs lattice matched to InP
AW Walker, MW Denhoff
Applied Physics Letters 111 (16), 2017
4 junction dilute nitride solar cell optimization: comparing current matching approaches in detailed balance algorithms
G Arbez, A Walker, M Wilkins, JF Wheeldon, A Trojnar, R Li, K Hinzer, ...
2013 IEEE 39th Photovoltaic Specialists Conference (PVSC), 2073-2077, 2013
Radiation hardness of AlGaAs nip solar cells with higher bandgap intrinsic region
AW Walker, S Heckelmann, T Tibbits, D Lackner, AW Bett, F Dimroth
Solar Energy Materials and Solar Cells 168, 234-240, 2017
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