Design of a Flexible Thin-Film Encapsulant with Sandwich Structures of Perhydropolysilazane Layers

• DOI: 10.1021/acsami.2c06699
• Publication Date: 2022-07-21T10:50:48Z
• Authors: Dajeong Kim; Gyeong G. Jeon; Jong H. Kim; Jincheol Kim; Nochang Park
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

Perovskite solar cells (PSCs) have attracted considerable attention due to their excellent photovoltaic properties, but stability issues prevented widespread application. PSCs must be protected by encapsulation extend lifetime. Here, we show that perhydropolysilazane (PHPS)-based multilayered improves the lifetime of PSCs. The were encapsulated converting PHPS into silica under vacuum ultraviolet (UV) irradiation. PHPS-based multilayer method achieved a sandwich structure PHPS/poly(ethylene terephthalate) (PET)/PHPS with water vapor transmission rate (WVTR) 0.92 × 10–3 gm–2 d–1 (at 37.8 °C and 100% relative humidity). We then performed reservoir test confirm moisture based on PHPS/PET/PHPS barrier films. cell remained stable even after 1000 h ambient-temperature operation. Finally, analyzed mechanical flexibility multibarrier through bending tests. exhibited high no large increase in WVTR bending.