Building a Six-Junction Inverted Metamorphic Concentrator Solar Cell

Geisz, John F.; Steiner, Myles A.; Jain, Nikhil; Schulte, Kevin L.; France, Ryan M.; McMahon, William E.; Perl, Emmett E.; Friedman, Daniel

doi:10.1109/jphotov.2017.2778567

Cited by 169 publications

(84 citation statements)

References 19 publications

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“…A second new result for Table is included as a multijunction cell “notable exception.” An efficiency of 39.2% was measured for a 0.25‐cm 2 six‐junction, two‐terminal, inverted metamorphic, monolithic Al 0.24 Ga 0.26 In 0.5 P/Al 0.26 Ga 0.74 As /Al 0.03 Ga 0.97 As / Ga 0.86 In 0.14 As/Ga 0.68 In 0.32 As/Ga 0.43 In 0.57 As cell fabricated by and measured at NREL . This is the highest efficiency ever measured for a one‐sun cell, although again cell area is too small to be considered as an outright record.…”

Section: New Resultsmentioning

confidence: 87%

Solar cell efficiency tables (version 54)

Green

Dunlop

Levi

et al. 2019

Progress in Photovoltaics

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Section: New Resultsmentioning

confidence: 87%

Solar cell efficiency tables (version 54)

Green

Dunlop

Levi

et al. 2019

Progress in Photovoltaics

1,272

408

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“…It is obvious that highly transparent top tunnel junction would give additional advance for the cell performance as increased current generation. It has been observed that minimizing the amount of GaAs in the top tunnel junction has resulted in excellent transparency . We estimate that the light absorption in the topmost tunnel junction consisting of 30 nm of GaAs could reduce the GaAs subjunction current by 0.6 mA/cm 2 .…”

Section: Resultsmentioning

confidence: 84%

Lattice‐matched four‐junction tandem solar cell including two dilute nitride bottom junctions

Aho

Isoaho

Hytönen

et al. 2018

Progress in Photovoltaics

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Monolithic four-junction solar cells incorporating two dilute nitride (GaInNAsSb) bottom junctions are reported. The dilute nitride junctions have band gaps of 0.9 and 1.2 eV, while the top junctions have band gaps of 1.4 and 1.9 eV. By using experimental-based parametrization, it was estimated that the four-junction solar cell could theoretically exhibit efficiency levels of 34.7% at one sun, 43.2% at 100 suns, and 46.4% at 1000 suns for AM1.5D illumination. The most challenging subcell in terms of fabrication is the GaInNAsSb bottom junction with 0.9 eV band gap. For this subcell, a background doping level down to 5 × 10 14 cm −3 and a high charge carrier lifetime up to 2 to 4 nanoseconds are reported, which reflects high values for current and voltage. An experimental AlGaAs/GaAs/GaInNAsSb/GaInNAsSb solar cell structure was fabricated by molecular beam epitaxy. At one-sun AM1.5D illumination, the experimental cell exhibited an efficiency of 25%, an average quantum efficiency of 91%, and an open circuit voltage, which is about 87% of the estimated potential.The cell exhibited maximum efficiency of 37% at 100-sun concentration.

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“…The multi-junction PV cells are formed by stacking multiple layers of solar cells with the range of the band gap energies, mostly direct C 2020, 6, 2; doi:10.3390/c6010002 www.mdpi.com/journal/carbon C 2020, 6, 2 2 of 13 band gap, resulting in higher PCE and absorption coefficient [11][12][13][14][15]. Currently, a six-junction (AlGaInP/AlGaAs/GaAs/GaInAs(3)) concentrator solar cell has the maximum power conversion efficiency of 47.1% at 143× suns illumination (1 sun power = 1 kW/m 2 ) [16,17]. Though multi-junction solar cell technology has been proven to be highly efficient compared to the conventional Si solar cells, thermal management of excess heat generated within the cell presents a major problem [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Non-Curing Thermal Interface Materials with Graphene Fillers for Thermal Management of Concentrated Photovoltaic Solar Cells

Mahadevan

Naghibi

Kargar

et al. 2019

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Temperature rise in multi-junction solar cells reduces their efficiency and shortens their lifetime. We report the results of the feasibility study of passive thermal management of concentrated multi-junction solar cells with the non-curing graphene-enhanced thermal interface materials. Using an inexpensive, scalable technique, graphene and few-layer graphene fillers were incorporated in the non-curing mineral oil matrix, with the filler concentration of up to 40 wt% and applied as the thermal interface material between the solar cell and the heat sink. The performance parameters of the solar cells were tested using an industry-standard solar simulator with concentrated light illumination at 70× and 200× suns. It was found that the non-curing graphene-enhanced thermal interface material substantially reduces the temperature rise in the solar cell and improves its open-circuit voltage. The decrease in the maximum temperature rise enhances the solar cell performance compared to that with the commercial non-cured thermal interface material. The obtained results are important for the development of the thermal management technologies for the next generation of photovoltaic solar cells.

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Building a Six-Junction Inverted Metamorphic Concentrator Solar Cell

Cited by 169 publications

References 19 publications

Solar cell efficiency tables (version 54)

Solar cell efficiency tables (version 54)

Lattice‐matched four‐junction tandem solar cell including two dilute nitride bottom junctions

Non-Curing Thermal Interface Materials with Graphene Fillers for Thermal Management of Concentrated Photovoltaic Solar Cells

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