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The Molybdenum Oxide Interface Limits the High-Temperature Operational Stability of Unencapsulated Perovskite Solar Cells by Tracy H. Schloemer; James A. Raiford; Timothy S. Gehan; Taylor Moot; Sanjini Nanayakkara; Steven P. Harvey; Rosemary C. Bramante; Sean Dunfield; Amy E. Louks; Annalise E. Maughan; Lyle Bliss; Michael D. McGehee; Maikel F. A. M. van Hest; Matthew O. Reese; Stacey F. Bent; Joseph J. Berry; Joseph M. Luther; Alan Sellinger is a Engineering article available to read on EtoBox.

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We report on the improved operational stability of unencapsulated perovskite solar cells (PSCs) aged in ambient atmosphere at elevated temperatures (70 C) for >1000 hours under constant illumination and bias at 30-50% relative humidity. We identify a previously unseen interfacial degradation mechanism concerning the use of an interlayer, MoO x , which was originally added to increase operational stability. Specifically, the hole-transport layer/MoO x interface buckles under illumination at 70 C, which leads to delamination and rapid losses in shortcircuit current density corresponding to an average t 80 of ~55 hours. By judicious evaluation of various holetransport layers, interlayers, and contacts, we find that replacing the MoO x with a VO x interlayer, regardless of the other components in the solar cell, alleviates this buckling issue due to its higher activation barrier towards crystallization, leading to significant gains in PSC operational stability. Unencapsulated devices aged in ambient atmosphere with a VO x interlayer retain 71% of initial PCE on average after 1100 hours of constant illumination and bias at 70 C (t 80 ~645 hours). Currently, this is the highest temper

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Author

Tracy H. Schloemer; James A. Raiford; Timothy S. Gehan; Taylor Moot; Sanjini Nanayakkara; Steven P. Harvey; Rosemary C. Bramante; Sean Dunfield; Amy E. Louks; Annalise E. Maughan; Lyle Bliss; Michael D. McGehee; Maikel F. A. M. van Hest; Matthew O. Reese; Stacey F. Bent; Joseph J. Berry; Joseph M. Luther; Alan Sellinger

Publisher

American Chemical Society (ACS)

Published

2020

Language

EN

Field

Engineering (Physical Sciences)