The quantum-confined Stark effect in layered hybrid perovskites mediated by orientational polarizability of confined dipoles

G. Walters, M. Wei, Oleksandr Voznyy, R. Quintero-Bermudez, A. Kiani, Detlef-M. Smilgies, Rahim Munir, Aram Amassian, S. Hoogland, E. Sargent

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

The quantum-confined Stark effect (QCSE) is an established optical modulation mechanism, yet top-performing modulators harnessing it rely on costly fabrication processes. Here, we present large modulation amplitudes for solution-processed layered hybrid perovskites and a modulation mechanism related to the orientational polarizability of dipolar cations confined within these self-assembled quantum wells. We report an anomalous (blue-shifting) QCSE for layers that contain methylammonium cations, in contrast with cesium-containing layers that show normal (red-shifting) behavior. We attribute the blue-shifts to an extraordinary diminution in the exciton binding energy that arises from an augmented separation of the electron and hole wavefunctions caused by the orientational response of the dipolar cations. The absorption coefficient changes, realized by either the red- or blue-shifts, are the strongest among solution-processed materials at room temperature and are comparable to those exhibited in the highest-performing epitaxial compound semiconductor heterostructures.
Original languageEnglish (US)
JournalNature Communications
Volume9
Issue number1
DOIs
StatePublished - Oct 11 2018

Fingerprint

Dive into the research topics of 'The quantum-confined Stark effect in layered hybrid perovskites mediated by orientational polarizability of confined dipoles'. Together they form a unique fingerprint.

Cite this