In Situ Solution-Processed Submicron Thick SiOx Cy /a-SiNx (O):H Composite Barrier Film for Polymer:Non-Fullerene Photovoltaics.
Small Methods
; 7(7): e2300224, 2023 Jul.
Article
in En
| MEDLINE
| ID: mdl-37029583
ABSTRACT
Aiming to improve the environmental stability of organic photovoltaics, a multilayered SiOx Cy /a-SiNx (O)H composite barrier film coated with a hydrophobic perfluoro copolymer stop layer for polymernon-fullerene solar cells is developed. The composite film is prepared by spin-coating of polysilicone and perhydropolysilazane (PHPS) following a densification process by vacuum ultraviolet irradiation in an inert atmosphere. The transformation of polysilicone and PHPS to SiOx Cy and a-SiNx (O)H is confirmed by Fourier transform infrared and energy-dispersive X-ray spectroscopy measurement. However, the as-prepared PHPS-derived silicon nitride (PDSN) can react with moisture in the ambient atmosphere, yielding microscale defects and a consequent poor barrier performance. Treating the incomplete PDSN with methanol vapor significantly densifies the film yielding low water vapor transmission rates (WVTRs)of 5.0 × 10-1 and 2.0 × 10-1 g m-2 d-1 for the one- and three-couple of SiOx Cy /a-SiNx (O)H (CON) composite films, respectively. By incorporating a thin hydrophobic perfluoro copolymer layer, the three-coupled methanol-treated CON film with a total thickness of 600 nm shows an extremely low WVTR of 8.7 × 10-4 g m-2 d-1 . No performance decay is measured for the PM6Y6 and PM6L8-BO cells after such an encapsulation process. These encapsulated polymer cells show good stability storaged at 25 °C/50% relative humidity, or under simulated extreme rainstorm tests.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Small Methods
Year:
2023
Type:
Article