Characterization of Multijunction Concentrator Solar Cells

Domínguez, César; García‐Linares, Pablo

doi:10.1007/978-3-319-15039-0_3

Cited by 6 publications

(2 citation statements)

References 60 publications

(77 reference statements)

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“…We can then conclude that the correction is not needed for the top component cell. However, the M bottom = 0.968 differs from unity by up to 3.2% and hence the X bottom measured by the pseudo‐isotype has to be corrected following Equation . This discrepancy is produced because in the bottom subcell spectral region (from 720 to 1200 nm) some important differences are observed between the simulator and the reference spectra, mainly because of Xe emission spikes and atmospheric light absorption produced by O 2 and H 2 O molecules.…”

Section: Resultsmentioning

confidence: 99%

Characterization of dual‐junction III‐V on Si tandem solar cells with 23.7% efficiency under low concentration

Veinberg‐Vidal

Vauche

Medjoubi

et al. 2019

Progress in Photovoltaics

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Monolithic two-terminal III-V on Si dual-junction solar cells, designed for low concentration applications, were fabricated by means of surface-activated direct wafer bonding. The III-V top cell is a heterojunction formed by an n-Ga 0.5 In 0.5 P emitter and a p-Al 0.2 Ga 0.8 As base. An efficiency of 21.1 ± 1.5% at one sun and 23.7 ± 1.7% at 10 suns is demonstrated, which to our knowledge is the best dual-junction twoterminal III-V on Si tandem cell efficiency reported to date under verified reference conditions. The I-V characterization of these 1-cm 2 tandem cells under concentration required the development of a new method using a single-source multiflash solar simulator and not perfectly matched component cells, also known as pseudoisotypes, formed by Si single-junction cells and optical filters. In addition, the spectrum of the pulsed solar simulator was measured using a high-speed CMOS spectrometer, allowing the calculation of the spectral mismatch correction factor. Merging these two techniques results in the hybrid corrected pseudo-isotype (HCPI) characterization method, which shows a fast and accurate performance with a simplified procedure based on a single-source solar simulator. Pseudo-isotypes are easily adaptable to new cell designs by simply using a different filter, hence allowing the characterization of new multijunction solar cell architectures.

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Section: Resultsmentioning

confidence: 99%

Characterization of dual‐junction III‐V on Si tandem solar cells with 23.7% efficiency under low concentration

Veinberg‐Vidal

Vauche

Medjoubi

et al. 2019

Progress in Photovoltaics

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“…The 1J structure is used for assessing the angle-dependent characteristics of the nanostructured coating, as with MJSC such characterization is challenging to do correctly and requires more developed instrumentation. 26,27 The actual broadband operation and suitability for MJSCs are then verified with the 4J SCs.…”

Section: Introductionmentioning

confidence: 99%

Optical Performance Assessment of Nanostructured Alumina Multilayer Antireflective Coatings Used in III–V Multijunction Solar Cells

Reuna

Hietalahti

Aho

et al. 2022

ACS Appl. Energy Mater.

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The optical performance of a multilayer antireflective coating incorporating lithography-free nanostructured alumina is assessed. To this end, the performance of single-junction GaInP solar cells and four-junction GaInP/GaAs/GaInNAsSb/GaInNAsSb multijunction solar cells incorporating the nanostructured alumina is compared against the performance of similar solar cells using conventional double-layer antireflective coating. External quantum efficiency measurements for GaInP solar cells with the nanostructured coating demonstrate angle-independent operation, showing only a marginal difference at 60° incident angle. The average reflectance of the nanostructured antireflective coating is ∼3 percentage points smaller than the reflectance of the double-layer antireflective coating within the operation bandwidth of the GaInP solar cell (280–710 nm), which is equivalent of ∼0.2 mA/cm 2 higher current density at AM1.5D (1000 W/m 2 ). When used in conjunction with the four-junction solar cell, the nanostructured coating provides ∼0.8 percentage points lower average reflectance over the operation bandwidth from 280 to 1380 nm. However, it is noted that only the reflectance of the bottom GaInNAsSb junction is improved in comparison to the planar coating. In this respect, since in such solar cells the bottom junction typically is limiting the operation, the nanostructured coating would enable increasing the current density ∼0.6 mA/cm 2 in comparison to the standard two-layer coating. The light-biased current–voltage measurements show that the fabrication process for the nanostructured coating does not induce notable recombination or loss mechanisms compared to the established deposition methods. Angle-dependent external quantum efficiency measurements incline that the nanostructured coating excels in oblique angles, and due to low reflectance at a 1000–1800 nm wavelength range, it is very promising for next-generation broadband multijunction solar cells with four or more junctions.

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A Three‐Terminal Hybrid Thermionic‐Photovoltaic Energy Converter

Bellucci

García‐Linares

Martı́

et al. 2022

Advanced Energy Materials

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Hybrid thermionic‐photovoltaics (TIPV) are solid‐state thermal‐to‐electric energy converters that rely on the non‐isothermal transport of photons and electrons through a vacuum gap. In contrast to pure thermionic converters, the absorption of photons in a photovoltaic anode produces an electrochemical potential that can be delivered as electricity, ultimately boosting the power generation capacity of the device. In this work, the proof of concept of a three‐terminal TIPV converter where thermionic and photogenerated currents are collected independently is reported. Thermionic electrons are injected in the conduction band of a semiconducting anode (n‐type InP), from where they are directly extracted. Photogenerated electrons are also extracted from the conduction band of the anode, but they are then reinjected in the valence band through an independent hole‐selective contact (p‐type InGaAs). By using a low workfunction engineered anode (BaFx/InP) and cathode (ScxOy/W) a maximum power generation capacity of 125.6 and 0.35 mW cm−2 for PV and thermionic sub‐devices, respectively, is demonstrated, operating at 1400 °C. This proof of concept paves the way for the development of efficient hybrid thermionic and photovoltaic converters for the direct conversion of heat into electricity, and subsequently contributes to finding an efficient alternative to thermoelectric generators.

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Characterization of Multijunction Concentrator Solar Cells

Cited by 6 publications

References 60 publications

Characterization of dual‐junction III‐V on Si tandem solar cells with 23.7% efficiency under low concentration

Characterization of dual‐junction III‐V on Si tandem solar cells with 23.7% efficiency under low concentration

Optical Performance Assessment of Nanostructured Alumina Multilayer Antireflective Coatings Used in III–V Multijunction Solar Cells

A Three‐Terminal Hybrid Thermionic‐Photovoltaic Energy Converter

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