Mechanical and optical degradation of flexible optical solar reflectors during simulated low earth orbit thermal cycling

Pütz, Barbara; Wurster, Stefan; Edwards, Thomas Edward James; Völker, Bernhard; Milassin, Gabor; Többens, Daniel M.; Semprimoschnig, Christopher; Cordill, Megan J.

doi:10.1016/j.actaastro.2020.05.032

Cited by 21 publications

(12 citation statements)

References 43 publications

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“…We first examine Al films, which show extreme adhesion on PI without the need of an additional adhesion promotion layer. The Al/PI system exhibits elevated mechanical properties and survives hundreds of thermal and strain cycles. , Focusing the e-beam on flat Al/PI films induces fine patterning (see Empa logo, Figure a). Optical confocal measurements confirm the height difference between the exposed and unexposed areas (Figure b).…”

Section: Resultsmentioning

confidence: 99%

Resist-Free E-beam Lithography for Patterning Nanoscale Thick Films on Flexible Substrates

Xomalis

Hain

Groetsch

et al. 2023

ACS Appl. Nano Mater.

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Resist-based lithographic tools, such as electron beam (e-beam) and photolithography, drive today’s state-of-the-art nanoscale fabrication. However, the multistep nature of these processes, expensive resists, and multiple other consumables limit their potential for cost-effective nanotechnology. Here, we report a one-step, resist-free, and scalable methodology for directly structuring thin metallic films on flexible polymeric substrates via e-beam patterning. Controlling e-beam dose results in nanostructures as small as 5 nm in height with a sub-micrometer lateral resolution. We structure nanoscale thick films (100 nm) of Al, TiN, and Au on standard Kapton tape to highlight the universal use of our nanopatterning methodology. Further, we utilize direct e-beam writing to create various high-resolution biomimetic surfaces directly onto ceramic thin films. In addition, we assemble architectured mechanical metamaterials comprising crack “traps”, which confine cracks and prevent overall material/device failure. Such a resist-free lithographic tool can reduce fabrication cost dramatically and may be used for different applications varying from biomimetic and architectured metamaterials to strain-resilient flexible electronics and wearable devices.

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Section: Resultsmentioning

confidence: 99%

Resist-Free E-beam Lithography for Patterning Nanoscale Thick Films on Flexible Substrates

Xomalis

Hain

Groetsch

et al. 2023

ACS Appl. Nano Mater.

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show abstract

“…What has been demonstrated with in-situ XRD, AFM, CLSM, and resistance measurements is brittle interlayers (D/B) and top layers (B/D) cause the ductile films to fail much sooner than if the brittle layer was not present. This behavior has implications not only for flexible electronics and sensors, but also for nanoscale multilayers [ 60 , 61 , 129 ] and thin films used in space applications [ 65 , 130 , 131 ].…”

Section: Materials Influencesmentioning

confidence: 99%

Materials Engineering for Flexible Metallic Thin Film Applications

2022

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More and more flexible, bendable, and stretchable sensors and displays are becoming a reality. While complex engineering and fabrication methods exist to manufacture flexible thin film systems, materials engineering through advanced metallic thin film deposition methods can also be utilized to create robust and long-lasting flexible devices. In this review, materials engineering concepts as well as electro-mechanical testing aspects will be discussed for metallic films. Through the use of residual stress, film thickness, or microstructure tailoring, all controlled by the film deposition parameters, long-lasting flexible film systems in terms of increased fracture or deformation strains, electrical or mechanical reliability, can be generated. These topics, as well as concrete examples, will be discussed. One objective of this work is to provide a toolbox with sustainable and scalable methods to create robust metal thin films for flexible, bendable, and stretchable applications.

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“…During his career, he dedicated a lot of effort to increase the understanding of the effect of the space environment on materials in general with a strong focus on thermo-optical properties [19]. Most of the materials used for thermal control were investigated: Polyimide [20], thin-polymer-film materials for potential use as solar sails [21], metal-polymerbased film [22][23][24].…”

Section: Space Environmentmentioning

confidence: 99%

Materials’ physics and chemistry for space application: in memoriam of Christopher Semprimoschnig

et al. 2021

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Mechanical and optical degradation of flexible optical solar reflectors during simulated low earth orbit thermal cycling

Cited by 21 publications

References 43 publications

Resist-Free E-beam Lithography for Patterning Nanoscale Thick Films on Flexible Substrates

Resist-Free E-beam Lithography for Patterning Nanoscale Thick Films on Flexible Substrates

Materials Engineering for Flexible Metallic Thin Film Applications

Materials’ physics and chemistry for space application: in memoriam of Christopher Semprimoschnig

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