Broadband and wide-angle light absorption of organic solar cells based on multiple-depths metal grating

Liu, Xin; Wang, Dan; Yang, Yibiao; Chen, Zhihui; Fei, Hongming; Cao, Binzhao; Zhang, Mingda; Cui, Yanxia; Hao, Yuying; Jian, Aoqun

doi:10.1364/oe.27.00a596

Cited by 17 publications

(12 citation statements)

References 57 publications

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“…Moreover we have found a general response pattern that can serve as a guide to optimize 3T homo-tandem cells. Recently, a similar spectral response has been induced by multiple-depths metal grating [21]. 3T cells have the advantage that they do not require short-circuit current matching, which is a strong constraint in series, or 2T, tandem cells [22,23].…”

Section: Introductionmentioning

confidence: 99%

Photonic effect of a central ultrathin metal film on the performance of series and parallel homo-tandem solar cells

Godefroid

Kozyreff

2020

Solar Energy Materials and Solar Cells

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We compare the performances of single cells, parallel and series homo-tandem solar cells by focusing on the effect of a central ultra thin metal film acting as an interconnecting layer in the series case or as an electrode in the parallel case. Cells with this metal film are found to outperform classic solar cells thanks to better interference management. Moreover, we find that photonic optimization from an absorption point of view can be accompanied by a reduction of the total amount of active material. We show that the best types of cell strongly depends on the maximum allowed active material thickness to ensure good carrier collection. We also compare ITO and a recently devised ITO-free alternative, the Two-Resonance Tapping Cavity, as transparent electrode and we show how this choice influences

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Section: Introductionmentioning

confidence: 99%

Photonic effect of a central ultrathin metal film on the performance of series and parallel homo-tandem solar cells

Godefroid

Kozyreff

2020

Solar Energy Materials and Solar Cells

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“…Currently, the next challenge is to find new ways to improve OSC efficiency and overcome the absorption barrier [ 27 ]. Many recent studies have tested the integration of gratings into OSC structures [ 28 , 29 , 30 , 31 ]. One of the common solutions is an ARC in the form of a grating layer [ 28 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, other mechanisms related to the integration of gratings into OSCs can improve OSC efficiency [ 27 , 32 ]. An example of such mechanisms is surface plasmon polariton (SPP) excitation by phase matching [ 29 , 30 , 33 ], which is based on confining the EM field on top of the grating ridges, within the grating grooves, or both, and thus improving the light trapping in the photo-active layer. It is important to highlight that integrating gratings into OSCs can also provide a broader absorption spectrum and improve angular performance [ 29 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Optical Confinement Enriching the Power Conversion Efficiency of Integrated 3D Grating Organic Solar Cell

et al. 2022

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In this paper, we examine the impact of three-dimensional grating layers embedded at selected locations in an organic solar cell structure to obtain enhanced efficiency. The design, simulations, and optimizations were carried out using an in-house tool based on the rigorous coupled-wave analysis (RCWA) method developed on the MATLAB R2019a platform. An optimal organic solar cell structure design with a top grating layer exhibited an increase of 7.47% in the short-circuit current density compared to an organic solar cell structure with a smooth top layer. The power conversion efficiency (PCE) increase was mainly due to increased light confinement in the thin absorbing layer. Adding an embedded grating layer in the absorption layer resulted in a significant increase in the absorptance spectral bandwidth, where the short-circuit current density increased by 10.88%. In addition, the grating cells yielded a substantial improvement in the cell’s conical absorptance since the existence of a surface plasmon polariton (SPP) in the back metal gratings increases the confinement properties. Further, the effect of a pyramid-shaped embedded grating array was a slight improvement in the PCE compared to the rectangular-shaped grating arrays. We showed that a pyramid-grating can act as a nano black-body layer, increasing the absorption for a wide range of azimuthal and polar incident angles.

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“…[27,28,30] To improve some of these parameters, nanostructured lighttrapping techniques can be utilized to maximize sunlight absorption, and possibly also the carrier extraction efficiency, leading to overall higher PCE. [31] Several approaches have been adopted in the laboratory to increase the sunlight absorption compared to conventional planar devices, [32] such as antireflection coatings, [33][34][35][36] Moth eye patterning, [37][38][39] light scattering films either on the front or back electrode for light management, [40,41] periodic nanostructured gratings (NGs), [42][43][44][45][46][47][48] and also metal nanoparticles. [49][50][51][52][53][54] Antireflection coatings are transparent coatings that are placed on top of solar cells to reduce light reflection, and thereby improving light absorption and PCE.…”

Section: Introductionmentioning

confidence: 99%

Efficiency‐Enhanced Scalable Organic Photovoltaics Using Roll‐to‐Roll Nanoimprint Lithography

Yakoob

Lamminaho

Petersons³

et al. 2021

ChemSusChem

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Light-trapping nanostructures have for decades been researched as a route to enhance the performance of organic solar cells (OSCs). Whereas the power conversion efficiencies (PCEs) of OSCs have reached above 18 %, industrially compatible devices made by scalable processing in air, using only nontoxic solvents and materials, have shown significantly lower performance values. Although light-trapping nanostructures may improve this, the methods for integrating the nanostructures are typically not compatible with industrial scale up. In this work, scalable, industrially compatible, nonfullerenebased OSCs are developed with integrated light-trapping nanostructures at the back electrodes in the devices. The OSCs are made by using scalable roll-to-roll (R2R) and sheet-to-sheet (S2S) processes and the nanostructures are made by using rollto-plate (R2P) nanoimprint lithography. A fully scalable solution is thereby developed for industrially compatible nanostructured OSCs. The nanostructured devices show enhancements in PCE up to 25 % compared to reference cells, owing to an enhancement in the short-circuit current density (15 %) by enhanced absorption, and improved charge carrier extraction leading to an enhancement in the fill factor (7 %). Optical modeling is utilized to verify the optical effect of the nanostructures. The best devices attain a PCE of 6.5 %, which is the highest reported efficiency for air-processed slot-die coated ITO-free flexible PBDB-T : ITIC devices, here using nontoxic solvents.

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Broadband and wide-angle light absorption of organic solar cells based on multiple-depths metal grating

Cited by 17 publications

References 57 publications

Photonic effect of a central ultrathin metal film on the performance of series and parallel homo-tandem solar cells

Photonic effect of a central ultrathin metal film on the performance of series and parallel homo-tandem solar cells

Enhanced Optical Confinement Enriching the Power Conversion Efficiency of Integrated 3D Grating Organic Solar Cell

Efficiency‐Enhanced Scalable Organic Photovoltaics Using Roll‐to‐Roll Nanoimprint Lithography

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