Development of a metal homogenizer for concentrator monolithic multi-junction-cells

Araki, Kiyomichi; Leutz, Ralf; Kondo, Michio; Akisawa, Atushi; Kashiwagi, Takao; Yamaguchi, Masafumi

doi:10.1109/pvsc.2002.1190914

Cited by 10 publications

(4 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Section: Introductionmentioning

confidence: 99%

Super-Multi-Junction Solar Cell, Device Configuration with the Potential of More Than 50 % of the Annual Energy Conversion Efficiency (Non-Concentration)

Araki¹,

Ota²,

Saiki³

et al. 2019

Preprint

View full text Add to dashboard Cite

The highest efficiency solar cell won in the efficiency race does not always give the most excellent annual energy yield in the real world solar condition that the spectrum is ever-changing. The study of the radiative coupling of the concentrator solar cells implied that the efficiency could increase by the recycle of the radiative recombination generated by the surplus current in upper junction. Such configuration of the multi-junction cells is often called by a super-multi-junction cell. We expanded it to non-concentrating installation. It was shown that this super-multi-junction cell configuration was found robust and can keep almost the same to the maximum potential efficiency (50 % in realistic spectrum fluctuation) up to 10 junctions by a Monte Carlo method. The super-multi-junction cell is also robust of the bandgap engineering of each junction. Therefore, the future multi-junction may not be needed to tune the bandgap for matching the standard solar spectrum, as well as relying upon artificial technologies like ELO, wafer-bonding, mechanical-stacking, and reverse-growth, but merely uses up-right and lattice-matching growth technologies. Although we have two challenging techniques; one is the optical cap layer that may be the directional photon coupling layer in the application of the photonics technologies, and another is the high-quality epitaxial growth with almost 100 % of the radiative efficiency.

show abstract

Section: Introductionmentioning

confidence: 99%

Super-Multi-Junction Solar Cell, Device Configuration with the Potential of More Than 50 % of the Annual Energy Conversion Efficiency (Non-Concentration)

Araki¹,

Ota²,

Saiki³

et al. 2019

Preprint

View full text Add to dashboard Cite

show abstract

“…A secondary optic or homogeniser element improves this and is needed to relax the demand on the system's accuracy [6, 7]. Some secondary concentrator optics include the compound parabolic concentrator (CPC) [8], the dome lens [9], the ball lens [10] and various homogenising light funnel geometries [11–13]. These typically take on the shape of an inverted cone or pyramid but there are also elliptical and hyperbolic optics possible [8, 14, 15].…”

Section: Introductionmentioning

confidence: 99%

Conjugate refractive–reflective homogeniser in a 500× Cassegrain concentrator: design and limits

Shanks

Baig

Reddy

2016

IET Renewable Power Generation

View full text Add to dashboard Cite

“…For CPV applications, it was understood that the chromatic aberration of the concentrator optics enhanced the spectrum mismatching loss [44][45][46][47][48][49][50][51][52][53]. However, such loss coupled with the concentrator optics could be solved by the innovation of optics, including homogenizers and the secondary optical element (SOE) [54][55]. The remaining problems of the spectrum mismatching loss have been overcome by the adjustment of the absorption spectrum of each sub-cell, including overlapping the absorption spectrum and broadening the absorption band to the zone of massive fluctuation.Recently, a new configuration by enhancing the radiative coupling among the sub-cells is found useful for solving this inherent loss of the multi-junction cells.…”

mentioning

confidence: 99%

Super-Multi-Junction Solar Cell, Device Configuration with the Potential of More Than 50 % of the Annual Energy Conversion Efficiency (Non-Concentration)

Araki¹,

Ota²,

Saiki³

et al. 2019

Preprint

View full text Add to dashboard Cite

The highest efficiency solar cell won in the efficiency race does not always give the most excellent annual energy yield in the real world solar condition that the spectrum is ever-changing. The study of the radiative coupling of the concentrator solar cells implied that the efficiency could increase by the recycle of the radiative recombination generated by the surplus current in upper junction. Such configuration is called by a super-multi-junction cell. We expanded the model in the concentrator solar cell to non-concentrating installation. It was shown that this super-multi-junction cell configuration was found robust and can keep the maximum potential efficiency (50 % in realistic spectrum fluctuation) up to 10 junctions. The super-multi-junction cell is also robust in the bandgap engineering of each junction. Therefore, the future multi-junction may not be needed to tune the bandgap for matching the standard solar spectrum, as well as relying upon artificial technologies like ELO (Epitaxial lift-off), wafer-bonding, mechanical-stacking, and reverse-growth, but merely uses up-right and lattice-matching growth technologies. We have two challenging techniques; one is the optical cap layer that may be the directional photon coupling layer in the application of the photonics technologies, and another is the high-quality epitaxial growth with almost 100 % of the radiative efficiency.

show abstract

Development of a metal homogenizer for concentrator monolithic multi-junction-cells

Cited by 10 publications

References 5 publications

Super-Multi-Junction Solar Cell, Device Configuration with the Potential of More Than 50 % of the Annual Energy Conversion Efficiency (Non-Concentration)

Super-Multi-Junction Solar Cell, Device Configuration with the Potential of More Than 50 % of the Annual Energy Conversion Efficiency (Non-Concentration)

Conjugate refractive–reflective homogeniser in a 500× Cassegrain concentrator: design and limits

Super-Multi-Junction Solar Cell, Device Configuration with the Potential of More Than 50 % of the Annual Energy Conversion Efficiency (Non-Concentration)

Contact Info

Product

Resources

About