Development of silicone-encapsulated CPV module based on LED package technology

Yamada, Noboru; Ijiro, Toshikazu; Goto, Wataru; Okamoto, Kazuya; Dobashi, Kazuo; Shiobara, Toshio

doi:10.1109/pvsc.2013.6744197

Cited by 11 publications

(6 citation statements)

References 1 publication

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“…1d, with the exception of the solar cells that were rigid (i.e., the GaInP/GaInAs/Ge triplejunction cells), the prototype module consisted of stretchable materials, namely, the thermoplastic polyurethane (TPU) sheet with the screen-printed electrode pattern and the silicone lens array. The triple-junction cells were encapsulated by the stretchable silicone lens, and the structure of the modules was basically the same as those of light-emitting diode (LED) packages, to which large-scale mounting technologies can be applied 41 . The lens-encapsulating design is advantageous because it reduces the number of lens-air interfaces penetrated by sunlight, implying a lower Fresnel reflection loss at the interfaces between dissimilar materials.…”

Section: Resultsmentioning

confidence: 99%

Stretchable micro-scale concentrator photovoltaic module with 15.4% efficiency for three-dimensional curved surfaces

et al. 2021

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Stretchable photovoltaics are emerging power sources for collapsible electronics, biomedical devices, and buildings and vehicles with curved surfaces. Development of stretchable photovoltaics are crucial to achieve rapid growth of the future photovoltaic market. However, owing to their rigidity, existing thin-film solar cells based predominantly on silicon, compound semiconductors, and perovskites are difficult to apply to 3D curved surfaces, which are potential real-world candidates. Herein, we present a stretchable micro-scale concentrator photovoltaic module with a geometrical concentration ratio of 3.5×. When perfectly fitted on a 3D curved surface with a sharp curvature, the prototype module achieves an outdoor power conversion efficiency of 15.4% and the daily generated electricity yield improves to a maximum of 190% relative to a non-concentration stretchable photovoltaic module. Thus, this module design enables high areal coverage on 3D curved surfaces, while generating a higher electricity yield in a limited installation area.

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Section: Resultsmentioning

confidence: 99%

Stretchable micro-scale concentrator photovoltaic module with 15.4% efficiency for three-dimensional curved surfaces

et al. 2021

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“…Hence, light attenuation (absorption loss) when the light travels in the lens medium can be reduced. The cell temperature can also be reduced for the same geometric concentration ratio, mainly because of rapid lateral heat dissipation from small cells . In addition, the amount of lens material used in the miniature hybrid module can be reduced.…”

Section: Fabrication and Experimentsmentioning

confidence: 99%

“…Other types of hybrid module designs that do not use conventional Fresnel lenses (with the lens aperture, i.e. the aperture size of a single lens that varies from several centimeters to several tens of centimeters) but rather miniaturized lenses and micro‐scale solar cells selected to improve optical and thermal performance and reduce material consumption have been studied . The results of ray‐tracing analyses show that for a constant geometric concentration ratio to the primary cell, the optical efficiency of the hybrid module increases as the module's lens and cell become smaller, mainly because light absorption loss in the lens material decreases as the thickness and volume of the lens decrease.…”

Section: Introductionmentioning

confidence: 99%

Maximization of conversion efficiency based on global normal irradiance using hybrid concentrator photovoltaic architecture

Yamada

Hirai

2016

Progress in Photovoltaics

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Maximization of module conversion efficiency based on global normal irradiance (GNI) rather than direct normal irradiance (DNI) was experimentally demonstrated using a hybrid concentrator photovoltaic (CPV) architecture in which a low-cost solar cell (a bifacial crystalline silicon cell) was integrated with a high-efficiency concentrator solar cell (III-V triple-junction cell) to harvest diffuse sunlight. The results of outdoor experiments showed that the low-cost cell enhanced the generated power by factors of 1.39 and 1.63 for high-DNI and midrange-DNI conditions, respectively, and that the resultant GNI-based module efficiencies were 32.7% and 25.6%, respectively.

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“…The miniaturization of CPV cells and modules also offers the opportunity to use simplified assembly processes that can be borrowed from LED manufacturing for example, as heat distribution on the carriers is more homogeneous with smaller cells 6 . The module miniaturization also benefits to optical elements: an increase of more than 5% in absolute optical efficiency is expected for low‐cost optics when reducing cell size from 1 mm to 100 μm on a side 7 . Finally, reducing the cell surface decreases the total current, mitigating resistive losses that scale with the square of the current 8,9 .…”

Section: Introductionmentioning

confidence: 99%

Miniaturization of InGaP/InGaAs/Ge solar cells for micro‐concentrator photovoltaics

Albert

Jaouad

Hamon

et al. 2021

Progress in Photovoltaics

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Micro‐concentrator photovoltaic (CPV), incorporating micro‐scale solar cells within concentrator photovoltaic modules, promises an inexpensive and highly efficient technology that can mitigate the drawbacks that impede standard CPV, such as resistive power losses. In this paper, we fabricate micro‐scale multijunction solar cells designed for micro‐CPV applications. A generic process flow, including plasma etching steps, was developed for the fabrication of complete InGaP/InGaAs/Ge microcells with rectangular, circular, and hexagonal active areas down to 0.089 mm2 (0.068‐mm2 mesa). Large cells (>1 mm2) demonstrate good electrical performance under one sun AM1.5D illumination, but a degradation in the open‐circuit voltage (VOC) is observed on the smallest cells. This effect is attributed to perimeter recombination for which a passivation effect by the antireflective coating partially recovers the VOC. The VOC penalty for small cells is also reduced under high‐intensity illumination, from 3.8% under sun to 1.0% at 974 suns. High intensity illumination yields an efficiency of 33.8% under 584 suns for a 0.25‐mm2 and microcells are expected to show higher efficiency than standard cells under very high concentration.

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Development of silicone-encapsulated CPV module based on LED package technology

Cited by 11 publications

References 1 publication

Stretchable micro-scale concentrator photovoltaic module with 15.4% efficiency for three-dimensional curved surfaces

Stretchable micro-scale concentrator photovoltaic module with 15.4% efficiency for three-dimensional curved surfaces

Maximization of conversion efficiency based on global normal irradiance using hybrid concentrator photovoltaic architecture

Miniaturization of InGaP/InGaAs/Ge solar cells for micro‐concentrator photovoltaics

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