December 1 - 6, 2024
Boston, Massachusetts
Symposium Supporters
2024 MRS Fall Meeting & Exhibit
EL04.18.35

Amidination of Ligands for Chemical and Field-Effect Passivation Stabilizes Perovskite Solar Cells

When and Where

Dec 5, 2024
8:00pm - 10:00pm
Hynes, Level 1, Hall A

Presenter(s)

Co-Author(s)

Yi Yang1,Bin Chen1,Mercouri Kanatzidis1,Edward Sargent1

Northwestern University1

Abstract

Yi Yang1,Bin Chen1,Mercouri Kanatzidis1,Edward Sargent1

Northwestern University1
Surface passivation has driven the rapid increase in the power conversion efficiency (PCE) of perovskite solar cells (PSCs). However, state-of-art surface passivation techniques rely on ammonium ligands that suffer deprotonation under light and thermal stress. We developed a library of amidinium ligands, of interest for their resonance-effect-enhanced N-H bonds that may resist deprotonation, to increase the thermal stability of passivation layers on perovskite surfaces. This strategy resulted in an over tenfold reduction in the ligand deprotonation equilibrium constant and a twofold increase in the maintenance of photoluminescence quantum yield after aging at 85°C under illumination in air. Implementing this approach, we achieved a certified quasi-steady-state PCE of 26.3% for inverted PSCs; and we report retention of ≥ 90% PCE after 1100 hours of continuous one-sun maximum power point operation at 85°C.

Keywords

surface chemistry

Symposium Organizers

Anita Ho-Baillie, The University of Sydney
Marina Leite, University of California, Davis
Nakita Noel, University of Oxford
Laura Schelhas, National Renewable Energy Laboratory

Symposium Support

Bronze
APL Materials

Session Chairs

Rebecca Belisle
Shaun Tan

In this Session