Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Surface versus Bulk State Transitions in Inkjet-Printed All-Inorganic Perovskite Quantum Dot Films

Thilini K. Ekanayaka
,
Dylan Richmond
,
Mason McCormick
,
Shashank R. Shashank R. Nandyala
,
Halle C. Helfrich
,
Alexander Sinitskii
ORCID logo ,
Jon M. Pikal
ORCID logo ,
Carolina C. Ilie
,
Peter A. Dowben
,
Andrew J. Yost
* ORCID logo
Version 1 : Received: 28 October 2022 / Approved: 31 October 2022 / Online: 31 October 2022 (10:03:45 CET)

A peer-reviewed article of this Preprint also exists.

Ekanayaka, T.K.; Richmond, D.; McCormick, M.; Nandyala, S.R.; Helfrich, H.C.; Sinitskii, A.; Pikal, J.M.; Ilie, C.C.; Dowben, P.A.; Yost, A.J. Surface Versus Bulk State Transitions in Inkjet-Printed All-Inorganic Perovskite Quantum Dot Films. Nanomaterials 2022, 12, 3956. Ekanayaka, T.K.; Richmond, D.; McCormick, M.; Nandyala, S.R.; Helfrich, H.C.; Sinitskii, A.; Pikal, J.M.; Ilie, C.C.; Dowben, P.A.; Yost, A.J. Surface Versus Bulk State Transitions in Inkjet-Printed All-Inorganic Perovskite Quantum Dot Films. Nanomaterials 2022, 12, 3956.

Abstract

Anion exchange of the halides, Br and I, is demonstrated through the direct mixing of two pure perovskite quantum dot solutions, CsPbBr3 and CsPbI3, and is shown to be both facile and result in a completely alloyed single phase mixed halide perovskite. Anion exchange is also observed in an interlayer printing method utilizing the pure, unalloyed perovskite solutions and a commercial inkjet printer. The halide exchange was confirmed by optical absorption spectroscopy, photoluminescent spectroscopy, X-ray diffraction, and X-ray photoemission spectroscopy characterization, and indicates that alloying is thermodynamically favorable, while the formation of a clustered alloy is not favored. Additionally, a surface-to-bulk photoemission core level transition is observed for the Cs 4d photoemission feature which indicates the electronic structure of the surface is different from the bulk. Time resolved photoluminescence spectroscopy indicates the presence of multiple excitonic decay features which is argued to originate from states residing at surface and bulk environments.

Keywords

Inkjet-printed perovskites, surface termination, CsPbBr3, surface states, bulk states, trap states

Subject

Chemistry and Materials Science, Nanotechnology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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