Dual Light Trapping and Water-Repellent Effects of a Flexible-Based Inverse Micro-Cone Array for Organic and Perovskite Solar Cells

Ginting, Riski Titian; Jeon, Eun-Bi; Kim, Jung-Mu; Jin, Won‐Yong; Kang, Jae‐Wook

doi:10.1021/acsami.8b08669

Cited by 33 publications

(27 citation statements)

References 31 publications

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“…In other words, a maximum absorption is obtained when the adequate balance between minimizing reflectivity at the air/h‐CPP interface and matching the indexes of the substrate and cell structure is reached. Provided the h‐CPP structure exhibits a 97% randomization capacity, we may conclude that any other kind of regular or periodic interface structuration would yield, at best, the same enhancement achieved by the h‐CPP. Rather than a different kind of interface structuration, a further enhancement of the light absorption percentage would require either a better back mirror to reduce parasite absorption or a thinner active layer as shown in Figure S3 in the Supporting Information.…”

Section: Theoretical Modelmentioning

confidence: 96%

Ergodic Light Propagation in a Half‐Cylinder Photonic Plate for Optimal Absorption in Perovskite Solar Cells

Martínez‐Denegri

Colodrero

Liu

et al. 2019

Advanced Optical Materials

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In an optical medium slab, a randomization of the interfaces will lead to an ergodic light propagation, implying a kind of light trapping that sets an upper limit for a broadband absorption enhancement factor. However, in thin film solar cells where such light trapping is most needed, it is not straightforward how the implementation of a surface randomization should be done. In addition, such randomization may also severely limit the electronic device performance. Here, a cylindrical periodic corrugation, which is named half‐cylinder photonic plate, is introduced at the light entering interface which leads to an ergodic light propagation. Advantage of such ergodicity is taken to enhance light absorption in a perovskite cell, physically separated by a planar glass substrate from such half‐cylinder photonic plate. Theoretically and experimentally it is demonstrated that the enhancement light absorption factor measured is close to the maximum possible for light trapping schemes using one interface periodic corrugations. This upper limit results from the ergodic light propagation that is achieved with a half‐cylinder photonic plate made from an optical transparent material with a low refractive index that minimizes light rejection by reflectivity.

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Section: Theoretical Modelmentioning

confidence: 96%

Ergodic Light Propagation in a Half‐Cylinder Photonic Plate for Optimal Absorption in Perovskite Solar Cells

Martínez‐Denegri

Colodrero

Liu

et al. 2019

Advanced Optical Materials

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“…Inverted pyramidal shapes with dimensions in the order of visible light wavelength were prepared using soft elastomeric stamp technique and integrated into organic solar cell as an ARC . Random and patterned V‐grooves with dimensions much larger than the wavelength were also employed to enhance the photovoltaic performance of thin organic solar cells . These wavelength‐scale structured haze films are made using a large‐scale compatible route for future printable PVs.…”

Section: Light Trapping Schemesmentioning

confidence: 98%

“…Compared with a flat device (PCE = 7.12%, J sc = 15.6 mA cm −2 ), improved PCE of 8.41% is achieved in a haze film, Figure a. Similar to microspheres, these microcones can act as an extreme water‐repellent design to add up self‐cleaning property to their trapping functionality, as shown in Figure b . The efficient light trapping has been also demonstrated in the dimensions orders of magnitude larger than the wavelength.…”

Section: Light Trapping Schemesmentioning

confidence: 99%

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Semiconductor Thin Film Based Metasurfaces and Metamaterials for Photovoltaic and Photoelectrochemical Water Splitting Applications

Ghobadi

Özbay

2019

Advanced Optical Materials

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throughput and large-scale compatibility. The photoactive material is generally composed of single or multiple semiconductor layers responsible for harvesting solar energy. This harvested solar irradiation can be used to generate electricity using photovoltaic (PV) devices, or it can be converted to chemical energy in the form of hydrogen which is the case for photoelectrochemical water splitting (PEC-WS). In both PV and PEC-WS applications, the ultimate goal is to establish an efficient photon capturing and electron collecting scheme to generate a huge number of photocarriers (including electron-hole pairs) with rational carrier dynamics (efficient charge generation, separation, and collection). This means that the device should be optically thick enough to generate high carrier's density and electrically thin enough to collect photogenerated carrier before they recombine. When light impinges a semiconductor surface, a part of the light is reflected back due to the mismatch between the air and the semiconductor layer refractive index. The rest will propagate within the bulk until it is fully absorbed by the semiconductor slab. The optical penetration depth (LPD) is defined as the depth at which the incident power falls to 1/e (≈37%) of its input value. This parameter differs from one semiconductor to another and it depends on the extinction coefficient (κ) of the In both photovoltaic (PV) and photoelectrochemical water splitting (PEC-WS) solar conversion devices, the ultimate aim is to design highly efficient, low cost, and large-scale compatible cells. To achieve this goal, the main step is the efficient coupling of light into active layer. This can be obtained in bulkysemiconductor-based designs where the active layer thickness is larger than light penetration depth. However, most low-bandgap semiconductors have a carrier diffusion length much smaller than the light penetration depth. Thus, photogenerated electron-hole pairs will recombine within the semiconductor bulk. Therefore, an efficient design should fully harvest light in dimensions in the order of the carriers' diffusion length to maximize their collection probability. For this aim, in recent years, many studies based on metasurfaces and metamaterials were conducted to obtain broadband and near-unity light absorption in subwavelength ultrathin semiconductor thicknesses. This review summarizes these strategies in five main categories: light trapping based on i) strong interference in planar multilayer cavities, ii) metal nanounits, iii) dielectric units, iv) designed semiconductor units, and v) trapping scaffolds. The review highlights recent studies in which an ultrathin active layer has been coupled to the above-mentioned trapping schemes to maximize the cell optical performance.

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“…Fan et al reported a polydimethyl siloxane (PDMS) nanocone array antireflection film for flexible perovskite solar cells with dual functions of light scattering and hydrophobic properties obtained by utilizing anodized aluminum as the rigid mold. Surface‐textured antireflection layers, patterned by etched silicon, hard plastic molds, or natural templates, have also been investigated for improved light‐harvesting capabilities. However, it is necessary to develop a facile fabrication method that is compatible with large‐scale perovskite solar cells and avoid the use of laborious and expensive procedures.…”

Section: Introductionmentioning

confidence: 99%

Nanoimprinted Grating‐Embedded Perovskite Solar Cells with Improved Light Management

Deng

Liu

Wang

et al. 2019

Adv Funct Materials

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Organic-inorganic halide perovskite solar cells are one of the most efficient photovoltaic devices, and their power conversion efficiency (PCE) continues to grow rapidly due to the optimization of device architecture and functional materials. The involved optical design has an important impact on performance by affecting the light harvesting capability. Here, demonstrated is a simple and effective strategy to boost device performance from the perspective of light management. A diffraction grating pattern into the TiO 2 scaffold and antireflection layer is simultaneously introduced to construct a double grating design for perovskite solar cells. The grating pattern obtained using a commercial compact disk as the hard mold can modulate light transport by enhancing the light transmittance and, thus, light absorption in perovskite solar cells. The grating pattern-induced light trapping can significantly increase the short-circuit current density and PCE by 4.8% and 7.9%, respectively, on average. The present work develops a feasible method by tailoring the morphology-related optical property to further improve the performance of perovskite solar cells. The double grating design can also generate structural color and can provide an alternative solution for fabricating colorful solar cells.

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Dual Light Trapping and Water-Repellent Effects of a Flexible-Based Inverse Micro-Cone Array for Organic and Perovskite Solar Cells

Cited by 33 publications

References 31 publications

Ergodic Light Propagation in a Half‐Cylinder Photonic Plate for Optimal Absorption in Perovskite Solar Cells

Ergodic Light Propagation in a Half‐Cylinder Photonic Plate for Optimal Absorption in Perovskite Solar Cells

Semiconductor Thin Film Based Metasurfaces and Metamaterials for Photovoltaic and Photoelectrochemical Water Splitting Applications

Nanoimprinted Grating‐Embedded Perovskite Solar Cells with Improved Light Management

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