Photochemical approach to high-barrier films for the encapsulation of flexible laminary electronic devices

Flexible Transparent Barrier Applications of Oxide Thin Films Prepared by Photochemical Conversion at Low Temperature and Ambient Pressure

“…This way, a sealing effect and a mechanical decoupling can operate as a combined advantage in multilayer stacks. WVTR values ≈ 10 −4 g m −2 d −1 can be obtained, and encapsulated CIGS-based thin-film solar cells were found to be stable in industrial climate testing (damp-heat exposure, thermo-cycles, UV exposure, and wetting) usually accepted as verification for a 20 years lifetime (Meyer et al, 2010;Morlier et al, 2013;Prager et al, 2014).…”

“…Photochemical preparation of inorganic thin films is the only non-vacuum method, in which formation of OH-groups can be avoided already while preparing the film. This leads to thin films with high density compared to other low-temperature processes (Table 1) (Prager et al, 2014;With et al, 2019a). Single layers of photochemically prepared silicon oxide thin films on PET films result in OTR and WVTR values of < 10 −2 cm 3 m −2 d −1 bar −1 (Channa et al, 2019) and 0.2 g m −2 d −1 (40 • C, 90% r.h.; Morlier et al, 2013).…”

“…Single layers of photochemically prepared silicon oxide thin films on PET films result in OTR and WVTR values of < 10 −2 cm 3 m −2 d −1 bar −1 (Channa et al, 2019) and 0.2 g m −2 d −1 (40 • C, 90% r.h.; Morlier et al, 2013). Knowledge about the photoconversion mechanism and kinetic data was an inevitable prerequisite for a successful transfer of the process to the pilot-scale (200 mm wide web) (Prager et al, 2014). The gas barrier quality thereby compares to results obtained with single layers of conventional vapor deposition processes (da Silva Sobrinho et al, 1999, 2000Czeremuszkin et al, 2001;Wuu et al, 2004;Bieder et al, 2005;Wolf et al, 2007).…”

“…Densities and refractive indices of PHPS-layers treated with varying temperatures or VUV-irradiation regimes(Prager et al, 2014).…”

Dense, uniform, smooth SiO2/TiO2hard coatings derived from a single precursor source of tetra-n-butyl titanate modified perhydropolysilazane

“…By exposing as-deposited PHPS coatings to high temperatures, moistening atmospheres, aqueous ammonia vapor, hydrogen peroxide solutions, or deep vacuum ultraviolet (DUV) irradiation at room temperature, SiO 2 coatings can be easily prepared that exhibit good adhesion to different substrates, and excellent thermal and mechanical stability, as well as high optical quality. [15][16][17][18][19][20][21][22][23] In addition, the Si-H and N-H groups in PHPS are highly reactive toward hydroxyl, alkoxyl, and epoxy groups, and halogen ions, which provides the possibility to modify PHPS with other reactive compounds. 24,25 Based on this, novel types of siliconbased multicomponent ceramics or organic-silica nanocomposites endowed with new properties have been developed.…”