Spectral Splitting Geometries for High Efficiency Multijunction Organic Solar Cells

Casademont‐Viñas, Miquel; Gibert‐Roca, Martí­; Liu, Quan; Vandewal, Koen; Goñi, Alejandro R.; Campoy‐Quiles, Mariano

doi:10.29363/nanoge.hopv.2022.029

Cited by 3 publications

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“…To carry out such measurements, we have developed a setup capable of generating custom light spectra that are homogeneous and can be dynamically modified with a high degree of accuracy ( Figure a). [ 40,48 ]…”

Section: Resultsmentioning

confidence: 99%

“…The full description of the setup will be published elsewhere, and details can be found in references. [ 40,48 ]…”

Section: Resultsmentioning

confidence: 99%

“…This work is focused on the study of the horizontal stack multi‐junction solar cell, whereas the wavelength dispersive element is discussed elsewhere. [ 40 ] It is worth mentioning, however, that such elements have been previously reported, with multiple solutions available such as the dispersive lens proposed by Thio et al., [ 41 ] or the holographic solution proposed by Vorndran et al. [ 42 ]…”

Section: Resultsmentioning

confidence: 99%

“…This work is focused on the study of the horizontal stack multi-junction solar cell, whereas the wavelength dispersive element is discussed elsewhere. [40] It is worth mentioning, however, that such elements have been previously reported, with multiple solutions available such as the dispersive lens proposed by Thio et al, [41] or the holographic solution proposed by Vorndran et al [42] The main advantage of the RAINBOW configuration lies on its ability to reduce both thermalization and absorption losses, while avoiding the limitations of vertical stack manufacturing, such as defect accumulation and optical transparency loss, [12,39] and the awkward form factor of other beam splitting geometries, [21,22] thanks to its planar lateral deposition configuration. While the RAINBOW geometry is not as simple as a single-junction device, in this novel configuration one can increase the number of subcells from 2 to N junctions without changing the form factor.…”

Section: Rainbow Conceptmentioning

confidence: 99%

“…The full description of the setup will be published elsewhere, and details can be found in references. [40,48] To validate the model we have chosen to perform SOLS RAIN-BOW measurements on the wide-narrow-gap cell combination, because of its high calculated IoBC, and its optimal dividing wavelength range that falls well within the SOLS spectral shaping capabilities. The individual SOLS characterization of the red and blue cell provides us with insights to assess the validity of the model assumptions.…”

Section: Model Validationmentioning

confidence: 99%

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RAINBOW Organic Solar Cells: Implementing Spectral Splitting in Lateral Multi‐Junction Architectures

et al. 2023

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While multi‐junction geometries have the potential to boost the efficiency of organic solar cells, the experimental gains yet obtained are still very modest. This work proposes an alternative spectral splitting device concept in which various individual semiconducting junctions with cascading bandgaps are laid side by side, thus the name RAINBOW. Each lateral sub‐cell receives a fraction of the spectrum that closely matches the main absorption band of the given semiconductor. Here, simulations are used to identify the important material and device properties of each RAINBOW sub‐cell. Using the resulting design rules, three systems are selected, with narrow, medium, and wide effective bandgaps, and their potential as sub‐cells in this geometry is experimentally investigated. With the aid of a custom‐built setup that generates spectrally spread sunlight on demand, the simulations are experimentally validated, showing that this geometry can lead to a reduction in thermalization losses and an improvement in light harvesting, which results in a relative improvement in efficiency of 46.6% with respect to the best sub‐cell. Finally, a working proof‐of‐concept monolithic device consisting of two sub‐cells deposited from solution on the same substrate is fabricated, thus demonstrating the feasibility and the potential of the RAINBOW solar cell concept.

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Section: Resultsmentioning

confidence: 99%

“…The full description of the setup will be published elsewhere, and details can be found in references. [ 40,48 ]…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Rainbow Conceptmentioning

confidence: 99%

Section: Model Validationmentioning

confidence: 99%

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RAINBOW Organic Solar Cells: Implementing Spectral Splitting in Lateral Multi‐Junction Architectures

et al. 2023

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Combinatorial screening of wide band-gap organic solar cell materials with open-circuit voltage between 1.1 and 1.4 V

Casademont-Viñas,

Capolat,

Quesada-Ramírez

et al. 2024

J. Mater. Chem. A

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RAINBOW Organic Solar Cells: Implementing Spectral Splitting in Lateral Multi‐Junction Architectures

Casademont-Viñas,

Gibert-Roca,

Liu

et al. 2023

Proceedings of the MATSUS Spring 2024 Conference

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While multi-junction geometries have the potential to boost the efficiency of organic solar cells, the experimental gains yet obtained are still very modest. This work proposes an alternative spectral splitting device concept in which various individual semiconducting junctions with cascading bandgaps are laid side by side, thus the name RAINBOW. Each lateral sub-cell receives a fraction of the spectrum that closely matches the main absorption band of the given semiconductor. Here, simulations are used to identify the important material and device properties of each RAINBOW sub-cell. Using the resulting design rules, three systems are selected, with narrow, medium, and wide effective bandgaps, and their potential as sub-cells in this geometry is experimentally investigated. With the aid of a custom-built setup that generates spectrally spread sunlight on demand, the simulations are experimentally validated, showing that this geometry can lead to a reduction in thermalization losses and an improvement in light harvesting, which results in a relative improvement in efficiency of 46.6% with respect to the best sub-cell. Finally, a working proof-of-concept monolithic device consisting of two sub-cells deposited from solution on the same substrate is fabricated, thus demonstrating the feasibility and the potential of the RAINBOW solar cell concept.

show abstract

Spectral Splitting Geometries for High Efficiency Multijunction Organic Solar Cells

Cited by 3 publications

References 0 publications

RAINBOW Organic Solar Cells: Implementing Spectral Splitting in Lateral Multi‐Junction Architectures

RAINBOW Organic Solar Cells: Implementing Spectral Splitting in Lateral Multi‐Junction Architectures

Combinatorial screening of wide band-gap organic solar cell materials with open-circuit voltage between 1.1 and 1.4 V

RAINBOW Organic Solar Cells: Implementing Spectral Splitting in Lateral Multi‐Junction Architectures

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