Light trapping for a-Si:H/µc-Si:H tandem solar cells using direct pulsed laser interference texturing

Ring, Sven; Neubert, S.; Schultz, Christof; Schmidt, S.; Ruske, F.; Stannowski, Bernd; Fink, F.; Schlatmann, Rutger

doi:10.1002/pssr.201409404

Cited by 14 publications

(13 citation statements)

References 31 publications

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“…At least in the case of the randomly textured cell, where the open‐circuit voltage remained equal, recombination parameters cannot have deteriorated. On another note, organic and a‐Si:H/μc‐Si:H tandem solar cells have been prepared on DLIP processed substrates, showing photocurrents and efficiencies enhanced by 9–21% . Since the values of FF and V OC remained nearly unchanged compared to reference devices, we can, on the one hand, discard a noteworthy decrease of shunt resistance in the structured solar cells, and on the other hand, suggest that the patterning on the TCO does not modify significantly the surface recombination velocity of the active layers.…”

Section: Optical Simulationsmentioning

confidence: 87%

Combining Thickness Reduction and Light Trapping for Potential Efficiency Improvements in Perovskite Solar Cells

Soldera

Taretto

2018

Physica Status Solidi (a)

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In this contribution it is shown that the efficiency of perovskite solar cells based on CH 3 NH 3 PbI 3 can be increased further by combining thickness reduction of the perovskite layer and light trapping. A physical model for the current/voltage curve of pin solar cells is used to reveal the beneficial impact of thinning on cell efficiency. If interface recombination is kept at moderate levels, the model shows that there is a potential efficiency increase above 20% relative (þ3% absolute) when thickness is reduced from 500 to 200 nm, provided total light absorption is maintained. A rigorous optical model is employed to calculate light absorption on typical state-of-the-art layer stacks patterned with sinusoidal grooves on ITO coated glass. The results suggest that solar light absorption in a flat, 500 nm thick film, can be matched by a 200 nm thick perovskite layer on a sinusoidal texture, while using 300 nm leads to several sinusoidal parameter combinations delivering the same light absorption. Since the structuring step must be compatible with low cost processing, it is shown that direct laser interference patterning (DLIP) is capable of delivering þ3% absolute efficiency increase, while offering a typical photovoltaic module cost reduction of 10%.

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Section: Optical Simulationsmentioning

confidence: 87%

Combining Thickness Reduction and Light Trapping for Potential Efficiency Improvements in Perovskite Solar Cells

Soldera

Taretto

2018

Physica Status Solidi (a)

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“…A periodic surface texture can efficiently be fabricated by a pulsed laser interference technique [36]. In addition to the capability of high J sc of micro-crystalline solar cells, the periodic surface texture when applied to μc-Si tandem solar cell showed J sc of 11.2 mA/cm 2 [36].…”

Section: Micrometer Size Surface Texture For Light Trapping In Thin Film Solar Cellmentioning

confidence: 99%

Present Status of Thin Film Solar Cells Using Textured Surfaces: A Brief Review

Park¹,

Iftiquar²,

Le³

et al. 2016

Transactions on Electrical and Electronic Materials

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This is a brief review on light trapping in Si based thin film solar cells with textured surfaces and transparent conducting oxide front electrodes. The light trapping scheme appears to be essential in improving device efficiency over 10%. As light absorption in a thin film solar cells is not sufficient, light trapping becomes necessary to be effectively implemented with a textured surface. Surface texturing helps in the light trapping, and thereby raises short circuit current density and its efficiency. Such a scheme can be adapted to single junction as well as tandem solar cell, amorphous or micro-crystalline devices. A tandem cell is expected to have superior performance in comparison to a single junction cell and random surface textures appears to be preferable to a periodic structures.

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“…Moreover, DLIP is a single‐step process that does not require masks or solvents, and therefore it is suitable for industrial manufacturing. This method has been successfully employed for the functionalization of surfaces, for instance, by controlled wettability, by improved electrical conductivity, by tailored tribological properties, by optimized light management in optoelectronic devices, by an increased biocompatibility of implants, or by controlling the direction of cellular growth . In particular, structural coloration using this method was already achieved on metallic as well as polymer substrates …”

Section: Introductionmentioning

confidence: 99%

How to Tailor Structural Colors for Extended Visibility and White Light Generation Employing Direct Laser Interference Patterning

Storm

Alamri

Soldera

et al. 2019

Macro Chemistry & Physics

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The appearance of a surface can be controlled by creating periodic microstructures designed to diffract light and produce structural colors. Nevertheless, since structural coloration is based on diffraction, the produced colors have a strong dependence on the viewing angle and absence of coloration takes place while tilting the samples. In this work direct laser interference patterning is used to firstly provide transparent polymer sheets a structural coloration with a high‐range observation angle, and secondly to demonstrate the combination of structural colors, producing a white coloring effect. The employed approaches are based on the fabrication of micro‐gratings with multiple periods in the same structured area and on the engineering of the diffraction orders of the diffraction spectrum. The patterned surfaces are characterized by confocal microscopy and angular spectrometry in reflection mode. The morphological characterization shows homogeneous surface patterns, while the spectral results demonstrate that combining four spatial periods on a single patterned surface, a white appearance is obtained over an angular observation range higher than 30°. The experimental results are supported by theoretical predictions by means of generalized formulas based on the diffraction of light.

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Light trapping for a-Si:H/µc-Si:H tandem solar cells using direct pulsed laser interference texturing

Cited by 14 publications

References 31 publications

Combining Thickness Reduction and Light Trapping for Potential Efficiency Improvements in Perovskite Solar Cells

Combining Thickness Reduction and Light Trapping for Potential Efficiency Improvements in Perovskite Solar Cells

Present Status of Thin Film Solar Cells Using Textured Surfaces: A Brief Review

How to Tailor Structural Colors for Extended Visibility and White Light Generation Employing Direct Laser Interference Patterning

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