Surface quasi periodic and random structures based on nanomotor lithography for light trapping

Sorkhabi, Sh. Golghasemi; Ahmadi-Kandjani, Sohrab; Cousseau, F.; Loumaigne, Matthieu; Zielinska, S.; Ortyl, Ewelina; Barille, Régis

doi:10.1063/1.4991480

Cited by 9 publications

(10 citation statements)

References 26 publications

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“…Having highlighted that SRG can come in almost all shapes and sizes, we continue hereafter by making a list of the wide variety of polymeric backbones that have been used over the years to create them. The most used polymers are based on polyacrylates, ,− especially the commercially available poly(disperse red 1 methacrylate) (pDR1m) (Figure a). pDR1m has the advantage of bearing a push–pull azobenzene derivative, with absorption spectra partially overlapped for the trans and cis isomers.…”

Section: Motion From Photochromic Molecular Switchesmentioning

confidence: 99%

“…Zettsu et al doped an azopolyacrylate film with poly(3-dodecylthiophene) . Azopolyurethanes were used for the inscription of SRG as well; ,,− for instance, Rochon and coworkers synthesized a polyurethane where the azobenzene derivative was in the hard segment (Figure g) . A few examples are available with poly(aryl ether): − Kim and coworkers prepared one with a perfluorocyclobutane moiety because these materials are stable towards temperature and mechanical forces, transparent, and easily synthesized and processed (Figure h) …”

Section: Motion From Photochromic Molecular Switchesmentioning

confidence: 99%

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Design of Collective Motions from Synthetic Molecular Switches, Rotors, and Motors

et al. 2019

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Precise control over molecular movement is of fundamental and practical importance in physics, biology, and chemistry. At nanoscale, the peculiar functioning principles and the synthesis of individual molecular actuators and machines has been the subject of intense investigations and debates over the past 60 years. In this review, we focus on the design of collective motions that are achieved by integrating, in space and time, several or many of these individual mechanical units together. In particular, we provide an in-depth look at the intermolecular couplings used to physically connect a number of artificial mechanically active molecular units such as photochromic molecular switches, nanomachines based on mechanical bonds, molecular rotors, and light-powered rotary motors. We highlight the various functioning principles that can lead to their collective motion at various length scales. We also emphasize how their synchronized, or desynchronized, mechanical behavior can lead to emerging functional properties and to their implementation into new active devices and materials.

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Section: Motion From Photochromic Molecular Switchesmentioning

confidence: 99%

Section: Motion From Photochromic Molecular Switchesmentioning

confidence: 99%

Design of Collective Motions from Synthetic Molecular Switches, Rotors, and Motors

et al. 2019

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“…Crystal packing views of 1 and mc 2 Zn w ; crystal, collection, and refinement data; relevant bond lengths and angles; thermogravimetric curves; FT-IR and UV− visible spectra of molecules and azomaterials; chemical structure of azp; refractive index dispersion curves and DSC diagrams of azomaterials; plot of theoretical diffraction efficiency for an ideal SRG; experimental setup scheme for SRG inscription and holographic structuration; and 1 H and 13 C NMR spectra of compounds (PDF)…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…All of the reagents were commercially available and used without further purification. 1 H and 13 C NMR spectra were recorded on Varian Inova 500 (500 MHz) and Bruker Ascend 400 (400 MHz) spectrometers. DSC diagrams were recorded on a METTLER TOLEDO DSC3+ calorimeter.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Efficient High-Refractive-Index Azobenzene Dendrimers Based on a Hierarchical Supramolecular Approach

Fusco

Oscurato²,

Salvatore

et al. 2023

Chem. Mater.

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Real-time manipulation of light in a diffractive optical element made with an azomaterial, through the lightinduced reconfiguration of its surface based on mass transport, is an ambitious goal that may enable new applications and technologies. The speed and the control over photopatterning/ reconfiguration of such devices are critically dependent on the photoresponsiveness of the material to the structuring light pattern and on the required extent of mass transport. In this regard, the higher the refractive index (RI) of the optical medium, the lower the total thickness and inscription time can be. In this work, we explore a flexible design of photopatternable azomaterials based on hierarchically ordered supramolecular interactions, used to construct dendrimer-like structures by mixing specially designed sulfur-rich, high-refractive-index photoactive and photopassive components in solution. We demonstrate that thioglycolic-type carboxylic acid groups can be selectively used as part of a supramolecular synthon based on hydrogen bonding or readily converted to carboxylate and participate in a Zn(II)−carboxylate interaction to modify the structure of the material and fine-tune the quality and efficiency of photoinduced mass transport. Compared with a conventional azopolymer, we demonstrate that it is possible to fabricate high-quality, thinner flat diffractive optical elements to reach the desired diffraction efficiency by increasing the RI of the material, achieved by maximizing the content of high molar refraction groups in the chemical structure of the monomers.

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“…To overcome the previously introduced limitations of OSCs, optical in‐coupling is one of the most straightforward approaches, and was introduced in the field of solar cells decades ago. For achieving excellent optical in‐coupling into Si solar cells, various structures, for instance, randomly nanoporous morphology, nanocones, quasi‐periodic‐structures, and nano‐ and microwires, have been implemented, and over a PCE of 22.1% was achieved by using so‐called black silicon . By applying these structures, we can increase the light path length in a limited absorption layer expecting enhancement of current generation and PCE.…”

Section: Optical In‐couplingmentioning

confidence: 99%

Optical In‐Coupling in Organic Solar Cells

2018

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thus offering an environmentally friendly approach. Furthermore, the use of simple low-temperature processing techniques makes it a potentially low-cost technology. However, efficiency and stability are so far lacking, hampering the full exploitation of the potential this technology has in these new applications. After the demonstration of the first reasonably performing organic solar cell by Tang [1] achieving approximately 1% efficiency, much effort has been put into improving these values. Nowadays, efficiencies well beyond 10%, and even over 13% have been reached, [2,3] however, with hard-to-synthesize polymers that so far have not shown sufficient stability for practical applications.Closer to commercial exploitation, solar cells based on oligomers (also termed "small molecules") and the material class used by Tang et al. [1] are investigated and introduced in their pioneering papers. [4][5][6][7][8][9][10][11][12][13][14][15] This material class can be either deposited by vacuum evaporation or solution processing. [16][17][18][19][20][21] The advantage of vacuum evaporation is that very pure layers without solvent residuals are produced, which is favorable for a higher stability of the cells. Also, they allow several cells to be very easily integrated into stacked multijunction devices. [22] With multijunction cells, Heliatek has reached an efficiency of 13.2% using proprietary materials that allow long lifetimes and can be readily manufactured. [23] Single-junction devices with similar published materials achieve above 8% efficiency [24] and above 10% in single-junction and tandem devices, respectively. [25] While these values are much improved as compared to the pioneering work of Tang, there is still a large gap to be closed to reach efficiencies comparable to silicon solar cells and other inorganic PV technologies.Here, first we will address limitations of organic solar cells, such as short exciton diffusion length, voltage, and transport problems. After that, various approaches to solve these challenges will be introduced. These include the bulk heterojunction, multijunction devices, and periodically patterned structures on substrates or active layers. Among these approaches, we focus on optical in-coupling, which allows more photons to be funneled into the thin organic active layers, yielding higher efficiencies. Limitations of Organic Solar CellsAlthough organic solar cells have huge potential and acceptable power conversion efficiencies (PCEs), they still have limitations caused by a short exciton diffusion length, charge transport, and low open-circuit voltage (V oc ). In this section, we briefly summarize why OSCs lack in efficiency, and optical in-coupling is required to improve the performance.Organic photovoltaics have many unique properties, such as flexibility, transparency, and low weight, which allows novel applications to be addressed. A remaining challenge is to increase the power conversion efficiencies into the range that is offered by conventional inorganic photovoltaics. Due to the li...

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Surface quasi periodic and random structures based on nanomotor lithography for light trapping

Abstract: Emerging photoluminescence from bilayer large-area 2D MoS 2 films grown by pulsed laser deposition on different substrates

Cited by 9 publications

References 26 publications

Design of Collective Motions from Synthetic Molecular Switches, Rotors, and Motors

Design of Collective Motions from Synthetic Molecular Switches, Rotors, and Motors

Efficient High-Refractive-Index Azobenzene Dendrimers Based on a Hierarchical Supramolecular Approach

Optical In‐Coupling in Organic Solar Cells

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