High efficiency phototransducers based on a novel vertical epitaxial heterostructure architecture (VEHSA) with thin p/n junctions

York, M. C. A.; Fafard, S.

doi:10.1088/1361-6463/aa60a6

Cited by 27 publications

(26 citation statements)

References 48 publications

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“…Parameters are tabulated in detail in Ref. [38], and these are generally consistent with other authors. Carrier lifetimes are sensitive to the quality of the crystal growth, and values obtained from the literature will not necessarily be well matched to a specific device, requiring some degree of calibration of the actual models.…”

Section: Modelssupporting

confidence: 77%

“…PT60), discussed in Ref. [38]. A tentative PT100 device would contain individual subcells as thin as 10nm (noting that this value is sensitive to the wavelength chosen, and in turn should be treated as an estimate) considered to be pushing the limits of viability, though such a device is interesting in its own right due to individual junctions effectively becoming quantum wells.…”

Section: Overview Of Vehsa Monochromatic Cellsmentioning

confidence: 99%

“…High conversion efficiencies for GaAs LPCs have been reported in the literature . However, the Vertical Epitaxial HeteroStructure Architechture (VEHSA) technology [30][31][32][33][34][35][36][37][38] has presented a major breakthrough in the field, with reported conversion efficiencies just under 70% (c.f. a previous reporting of 53.4% in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…The working principle here is that splitting the photocurrent over many junctions reduces I R 2 losses and loads on the tunnel junction, allowing for the possibility of operation under high solar concentration (with the goal being in excess of 1000 suns [45]). There is an added benefit of using a vertical arrangement of thin junctions since thin layers achieve a greater Fermi level splitting [46], which on a per-junction level offers a marginal boost in V oc when compared to a planar arrangement of bulk cells (potentially 92 mV per junction [38]).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Challenges and strategies for implementing the vertical epitaxial heterostructure architechture (VEHSA) design for concentrated photovoltaic applications

York

Mailhot

Boucherif

et al. 2018

Solar Energy Materials and Solar Cells

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Monochromatic conversion efficiencies in excess of 60% have been achieved with Vertical Epitaxial HeteroStructure Architechture laser power converters (with anywhere from 5 to 20+ n/p junctions stacked vertically). We are presently investigating the applicability of this design to solar cells, whereby the individual junctions of a multi-junction cell are replaced with a current matched stack of subcells. If viable, such a design offers the potential for efficiency gains via reduced I R 2 losses and elevated V oc. Moreover, splitting the shortcircuit current over additional junctions opens up the possibility of operation under concentration ratios otherwise considered impractical for conventional cells.

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Section: Modelssupporting

confidence: 77%

Section: Overview Of Vehsa Monochromatic Cellsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Challenges and strategies for implementing the vertical epitaxial heterostructure architechture (VEHSA) design for concentrated photovoltaic applications

York

Mailhot

Boucherif

et al. 2018

Solar Energy Materials and Solar Cells

Self Cite

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“…За последние годы достигнут значительный прогресс в разработке эффективных фотоэлектрических преобразователей мощного лазерного излучения, работающих в фотовольтаическом режиме, без приложения внешнего обратного напряжения [1][2][3]. Высокая эффективность преобразователей монохроматического излучения достижима при оптимальном согласовании ширины запрещенной зоны полупроводникового материала с энергией падающих фотонов.…”

Section: поступило в редакцию 24 июля 2018 гunclassified

Влияние механизмов токопрохождения на эффективность фотодиодов Al-=SUB=-x-=/SUB=-Ga-=SUB=-1-x-=/SUB=-As/GaAs

Калиновский¹,

Контрош²,

Климко³

et al. 2018

Письма В Журнал Технической Физики

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Photovoltaic characteristics of heterostructure Al_ x Ga_1 – x As/GaAs p – i – n photodiodes fabricated by molecular-beam epitaxy have been studied. Efficiencies of 50% were reached in conversion of monochromatic light in the photovoltaic mode at power density of up to 200 W/cm^2 at a wavelength λ = 830 nm. A relationship was demonstrated between the “saturation currents” for the diffusion-related charge-transport mechanism (Shockley) in p – i – n photodiodes, calculated from dark current–voltage characteristics, and the experimental values of efficiency. As the “saturation current” of the diffusion-related charge-transport mechanism increases by an order of magnitude, a relative decrease in the efficiency from the maximum value by more than 10% is observed under excitation by constant or pulsed monochromatic light.

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Integrated series/parallel connection for photovoltaic laser power converters with optimized current matching

Wagner

Reichmuth

Philipps

et al. 2020

Progress in Photovoltaics

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In this paper, we present a stepped architecture optimized for current matching in high‐voltage laser power converter photovoltaic (PV) cells. The integrated series/parallel connection in stepped PV cells combines the advantages of well‐known multijunction and multisegment approaches with respect to current matching, whereas their specific drawbacks are circumvented. The superior misalignment tolerance of stepped PV cells in comparison with multisegment cells is shown by simulations of the maximum acceptable misalignment (MAM) for a range of devices with various output voltages. We present the first realization of stepped PV cells with two stacked GaAs‐based pn‐junctions. Thereby, the unique properties of the lateral current flow in the bottom cell and the assessment of the optical absorption in the subcells are discussed. Moreover, the effects of segmentation and number of stacked junctions on the I‐V characteristics are investigated. Finally, the behavior towards misalignment of a laser spot is studied for stepped and multisegment PV cells. An optimal current matching for misalignment‐prone power‐by‐light systems is found with a six‐segment stepped PV cell.

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High efficiency phototransducers based on a novel vertical epitaxial heterostructure architecture (VEHSA) with thin p/n junctions

Cited by 27 publications

References 48 publications

Challenges and strategies for implementing the vertical epitaxial heterostructure architechture (VEHSA) design for concentrated photovoltaic applications

Challenges and strategies for implementing the vertical epitaxial heterostructure architechture (VEHSA) design for concentrated photovoltaic applications

Влияние механизмов токопрохождения на эффективность фотодиодов Al-=SUB=-x-=/SUB=-Ga-=SUB=-1-x-=/SUB=-As/GaAs

Integrated series/parallel connection for photovoltaic laser power converters with optimized current matching

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