Thin Film Encapsulation of Organic Solar Cells by Direct Deposition of Polysilazanes from Solution

Channa IA, Distler A, Zaiser M, Brabec C, Egelhaaf HJ (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Advanced Energy Materials Wiley

Book Volume: 9

Journal Issue: 26

DOI: 10.1002/aenm.201900598

Abstract

Organic electronic devices (OEDs), e.g., organic solar cells, degrade quickly in the presence of ambient gases, such as water vapor and oxygen. Thus, in order to extend the lifetime of flexible OEDs, they have to be protected by encapsulation. A solution-based encapsulation method is developed, which allows the direct deposition of the diffusion barrier on top of OEDs, thus avoiding lamination of barrier films. The method is based on the deposition of a perhydropolysilazane (PHPS) ink and its subsequent conversion into a silica layer by deep UV irradiation. The resulting barrier films show water vapor transmission rates (WVTRs) of <10(-2) g m(-2) d(-1) (40 degrees C/85% relative humidity (RH)) and oxygen transmission rates (OTRs) of <10(-2) cm(3) m(-2) d(-1) bar(-1) at ambient conditions. Flexibility of the resulting barrier films is improved by coating a barrier stack of several thin PHPS layers alternating with organic polymer interlayers. These stacks show an increase of WVTR values by less than 10% after 3000 bending cycles. Direct coating of the PHPS films on top of organic solar cells enhances the device lifetime in damp heat conditions from a few hours to beyond 300 h.

Authors with CRIS profile

Iftikhar Ahmed Channa Institute Materials for Electronics and Energy Technology (i-MEET) Andreas Distler Institute Materials for Electronics and Energy Technology (i-MEET) Michael Zaiser Lehrstuhl für Werkstoffsimulation Christoph Brabec Institute Materials for Electronics and Energy Technology (i-MEET) Hans-Joachim Egelhaaf Institute Materials for Electronics and Energy Technology (i-MEET)

Involved external institutions

Bayerisches Zentrum für Angewandte Energieforschung e.V. (ZAE Bayern) DE Germany (DE)

How to cite

APA:

Channa, I.A., Distler, A., Zaiser, M., Brabec, C., & Egelhaaf, H.-J. (2019). Thin Film Encapsulation of Organic Solar Cells by Direct Deposition of Polysilazanes from Solution. Advanced Energy Materials, 9(26). https://dx.doi.org/10.1002/aenm.201900598

MLA:

Channa, Iftikhar Ahmed, et al. "Thin Film Encapsulation of Organic Solar Cells by Direct Deposition of Polysilazanes from Solution." Advanced Energy Materials 9.26 (2019).

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