Presentation Details
| Lead halide seeding via vacuum deposition enables the formation of compositionally diverse 2D/3D perovskite heterostructures Elizabeth M.Wall, Quinn C.Burlingame, Yueh-Lin Loo. Princeton University, Princeton, NJ, USA |
Abstract
The formation of 2D perovskite capping layers is notoriously difficult atop inorganic perovskites, such as CsPbI3, where strong interactions between Cs+ and [PbI6]4- octahedra inhibit cation exchange between bulk Cs+ and the cationic ligands in most 2D-forming organic halide salts. This significantly limits the surface passivation options available to inorganic perovskite solar cells, restricting their performance and stability. To address this challenge, we show that evaporating a PbX2 seed layer atop CsPbI3, where X is a halide, and subsequently depositing a solution of organoammonium halide salt can form a wide range of stoichiometric 2D perovskite overlayers while avoiding the need for solvent orthogonality associated with depositing PbX2 via solution processing. These 2D layers include alkylammonium and aryl ammonium-based Ruddlesden-Popper 2D perovskites and alkylammonium Dion-Jacobson 2D perovskites comprising I, Br, Cl, and mixed halides. We also show that this method is broadly applicable atop other 3D perovskites, including formamidinium lead iodide and CsPbBr0.5Cl2.5. Access to these previously unachievable 2D/3D perovskite combinations can potentially improve energetic band alignment, interface structural stability, and perovskite solar cell performance and stability.
No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.
No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.