Assessment of protective coatings on flexible CIGS modules for satellites

Banik, Udayan; Reininghaus, Nies; Seefeldt, Patric; Sznajder, Maciej; Gehrke, Kai; Vehse, Martin; Spietz, Peter; Sproewitz, Tom; Agert, Carsten

doi:10.1109/espc.2019.8932031

Cited by 1 publication

(2 citation statements)

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“…In this paper, we demonstrate for the first time a spectrally selective planar polymer emitter derived from polysilazane which was used in combination with a highly reflective 230 nm thick silver layer on an aluminum substrate to create a PDRC structure. Polysilazanes are silicon-based precursor polymers with alternating silicon and nitrogen atoms in its backbone and have been an area of intense research since the 1960s. , Substantial efforts were made to understand the optical properties of PSZ coatings. − Recently we identified and demonstrated the high emissivity, optical transparency, flexibility, and protective properties against mechanical abrasion of silicon oxycarbonitride (SiCNO) emitter coating derived from PSZ on thin-film solar cells for space applications. , PSZ-derived coatings show outstanding mechanical sturdiness, hydrophobicity, and chemical stability and have strong adhesive properties to most substrates even as cross-linked polymers. − These desirable properties of the PSZ polymer coating make it an appealing material to be used as an emitter for PDRC applications. The thin polymer emitter layer, fabricated from a polysilazane (PSZ) precursor, is easy to apply and has molecular vibrations that overlap with the 8–13 μm atmospheric transmission window exceedingly well.…”

Section: Introductionmentioning

confidence: 99%

“…37−41 Recently we identified and demonstrated the high emissivity, optical transparency, flexibility, and protective properties against mechanical abrasion of silicon oxycarbonitride (SiCNO) emitter coating derived from PSZ on thin-film solar cells for space applications. 37,42 PSZ-derived coatings show outstanding mechanical sturdiness, hydrophobicity, and chemical stability and have strong adhesive properties to most substrates even as cross-linked polymers. 43−45 These desirable properties of the PSZ polymer coating make it an appealing material to be used as an emitter for PDRC applications.…”

Section: ■ Introductionmentioning

confidence: 99%

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Efficient Thin Polymer Coating as a Selective Thermal Emitter for Passive Daytime Radiative Cooling

Banik¹,

Agrawal²,

Meddeb³

et al. 2021

ACS Appl. Mater. Interfaces

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Radiative cooling to subambient temperatures can be efficiently achieved through spectrally selective emission, which until now has only been realized by using complex nanoengineered structures. Here, a simple dip-coated planar polymer emitter derived from polysilazane, which exhibits strong selective emissivity in the atmospheric transparency window of 8–13 μm, is demonstrated. The 5 μm thin silicon oxycarbonitride coating has an emissivity of 0.86 in this spectral range because of alignment of the frequencies of bond vibrations arising from the polymer. Furthermore, atmospheric heat absorption is suppressed due to its low emissivity outside the atmospheric transparency window. The reported structure with the highly transparent polymer and underlying silver mirror reflects 97% of the incoming solar irradiation. A temperature reduction of 6.8 °C below ambient temperature was achieved by the structure under direct sunlight, yielding a cooling power of 93.7 W m–2. The structural simplicity, durability, easy applicability, and high selectivity make polysilazane a unique emitter for efficient prospective passive daytime radiative cooling structures.

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