Photonic-structured TiO2 for high-efficiency, flexible and stable Perovskite solar cells

Haque, Sirazul; Mendes, Manuel J.; Sánchez-Sobrado, Olalla; Águas, Hugo; Fortunato, Elvira; Martins, Rodrigo

doi:10.1016/j.nanoen.2019.02.023

Cited by 116 publications

(135 citation statements)

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“…The novel photonic-structured ZnO-based front contacts presented here are promising and can be straightforwardly applied in a wide range of thin-film photovoltaic technologies, for instance those based in perovskite materials as already predicted in recent modelling works. 13,14 5 Acknowledgments…”

Section: Discussionmentioning

confidence: 99%

“…9 CL is a particularly advantageous softlithography technique for application in PV, as it that can be adapted to precisely nano/micro-pattern any material with the dimensions appropriate for efficient light trapping, and implemented in any type of solar cell with different absorbers (e.g. based in perovskites 13,14 , CIGS 15 , etc). In a subsequent work the authors have shown that, when integrated on a-Si TFSCs, such TiO2-based LT structures fabricated by CL can lead to notorious increments (up to 21.5%) in the short-circuit current density (JSC) but to less pronounced enhancements (up to 13%) in the efficiencies, with respect to flat reference cells 16 .…”

Section: Introductionmentioning

confidence: 99%

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Photonic-structured TCO front contacts yielding optical and electrically enhanced thin-film solar cells

et al. 2020

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Wavelength-structured transparent conductive oxide (TCO) electrodes are highly promising to improve both the optical and electrical performance of photovoltaic (PV) devices, due to wave-optical light-trapping (LT) effects and higher TCO volume without increasing optical losses.Herein we present a complete study of the benefits of microstructured IZO contacts applied on amorphous-silicon (a-Si) thin film solar cells. The IZO LT structures were integrated by an innovative colloidal lithography process on the front contact of the cells, resulting in enhancements of 26.7% in photocurrent, with respect to planar reference cells, when using an ultra-thin (30 nm) flat IZO layer between the LT structures and the a-Si absorber. However, the best efficiency enhancement (23.1%) was attained with an optimized thickness of 190 nm for this layer, due to a more favorable combination of optical and electrical gains.In view of the application of this LT strategy in flexible PV devices operating under bending, the angular response of the cells was studied for 0-90º incidence angles. This showed that the LT enhancements are generally higher at oblique incidence, reaching 53.2% and 52%, respectively in photocurrent and efficiency, at ±70º angles with the optimized flat IZO thickness of 190 nm; and 52.2% in efficiency at ±40º with the ultra-thin thickness of 30 nm. These results are among the highest gains reported thus far for LTenhanced thin film solar cells.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photonic-structured TCO front contacts yielding optical and electrically enhanced thin-film solar cells

et al. 2020

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“…As a perovskite top cell is considered with a significant thickness (500 nm), the absorption of this layer needs little improvement, although thinner perovskite films could be considered when considering LT, as recently shown in literature. 23 As such, we seek to optimize the interlayer region for the benefit of the bottom cell, c-Si, and thus the photocurrent density of this layer is the chosen figure of merit. Table 1 lists the optimal interlayer parameters that yield the maximum Jph.…”

Section: All-thin-film Perovskite/c-si Four-mentioning

confidence: 99%

All-Thin-Film Perovskite/C–Si Four-Terminal Tandems: Interlayer and Intermediate Contacts Optimization

Chapa

Alexandre

Mendes

et al. 2019

ACS Appl. Energy Mater.

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Combined perovskite/crystalline-silicon 4-Terminal tandem solar cells promise >30% efficiencies. Here we propose all-thin-film double-junction architectures where high-bandgap perovskite top cells are coupled to ultra-thin c-Si bottom cells enhanced with light-trapping. A complete optoelectronic model of the devices was developed and applied to determine the optimal intermediate layers, which are paramount to maximize the cells' photocurrent. It was ascertained that, by replacing the transparent conductive oxides by grid-based metallic contacts in the intermediate positions, the parasitic absorption is lowered by 30%. Overall, a 29.2% efficiency is determined for ~2um thick tandems composed of the optimized interlayers and improved with Lambertian light-trapping.

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“…Nanostructured titania (TiO 2 ) films are chemically stable, nontoxic, low cost and have a controllable nanomorphology . Due to these advantages, they contribute to a wide range of applications, such as in the field of photocatalysis, gas sensing, lithium‐ion batteries, supercapacitors, and biomaterials .…”

Section: Introductionmentioning

confidence: 99%

Morphology Phase Diagram of Slot‐Die Printed TiO₂Films Based on Sol–Gel Synthesis

Song

Bießmann

et al. 2019

Adv Materials Inter

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to these advantages, they contribute to a wide range of applications, such as in the field of photocatalysis, [5] gas sensing, [6] lithium-ion batteries, [7] supercapacitors, [8] and biomaterials. [9] In addition, nanostructured TiO 2 , especially in its anatase polymorph, has attracted great attention in the field of photovoltaics due to its wide bandgap, high electron mobility, and long chargecarrier lifetime. [10][11][12][13] As electron transport layer in solid-state dye-sensitized solar cells and hybrid solar cells, nanostructured TiO 2 films with a high surface-to-volume area and interconnected network are desirable because they hold the potential to improve the generation of charge carriers and inhibit electron-hole recombination. [14,15] The combination of sol-gel chemistry with an amphiphilic block copolymer acting as a structure-directing template was proven to be a promising route for producing nanostructured TiO 2 films. [16][17][18][19][20] The obtained sol-gel solution can be directly deposited by various film fabrication techniques, such as spin coating, [21] solution casting, [22] doctor blading, [23] spray coating, [24] or inkjet printing. [25] To date, most attention of such kind of wet chemical TiO 2 film fabrication has only been paid to laboratory-scale Mesoporous titania films with tailored nanostructures are fabricated via slot-die printing, which is a simple and cost-effective thin-film deposition technique with the possibility of a large-scale manufacturing. Based on this technique, which is favorable in industry, TiO 2 films possess the similar advantage with polymer semiconducting devices like ease of large-scale production. The titania morphologies, including foam-like nanostructures, nanowire aggregates, collapsed vesicles and nanogranules, are achieved via a so-called block-copolymer-assisted sol-gel synthesis. By adjusting the weight fraction of reactants, the ternary morphology phase diagram of the printed titania films is probed after template removal. The surface and inner morphology evolutions are explored with scanning electron microscopy and grazing incidence small-angle X-ray scattering, respectively. Special focus is set on foam-like titania nanostructures as they are of especial interest for, e.g., solar cell applications. At a low weight fraction of the titania precursor titanium(IV)isopropoxide (TTIP), foam-like titania films are achieved, which exhibit a high uniformity and possess large pore sizes. The anatase phase of the highly crystalline titania films is verified with X-ray diffraction and transmission electron microscopy.

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Photonic-structured TiO2 for high-efficiency, flexible and stable Perovskite solar cells

Cited by 116 publications

References 68 publications

Photonic-structured TCO front contacts yielding optical and electrically enhanced thin-film solar cells

Photonic-structured TCO front contacts yielding optical and electrically enhanced thin-film solar cells

All-Thin-Film Perovskite/C–Si Four-Terminal Tandems: Interlayer and Intermediate Contacts Optimization

Morphology Phase Diagram of Slot‐Die Printed TiO₂Films Based on Sol–Gel Synthesis

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Photonic-structured TiO2 for high-efficiency, flexible and stable Perovskite solar cells

Cited by 116 publications

References 68 publications

Photonic-structured TCO front contacts yielding optical and electrically enhanced thin-film solar cells

Photonic-structured TCO front contacts yielding optical and electrically enhanced thin-film solar cells

All-Thin-Film Perovskite/C–Si Four-Terminal Tandems: Interlayer and Intermediate Contacts Optimization

Morphology Phase Diagram of Slot‐Die Printed TiO2Films Based on Sol–Gel Synthesis

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Morphology Phase Diagram of Slot‐Die Printed TiO₂Films Based on Sol–Gel Synthesis