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Issue 3, 2021
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Tuning halide perovskite energy levels

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Abstract

The ability to control the energy levels in semiconductors is compelling for optoelectronic applications. In this study, we managed to tune the work function (WF) of halide perovskite semiconductors using self-assembled monolayers of small molecules to induce stable dipoles at the surface. The direction and intensity of the surface dipoles rely on specific molecule-to-surface interactions. Electron acceptor or donor molecules result in the positive or negative WF shifts up to several hundreds of meV. Our approach provides a versatile tool to control the WF of halide perovskite and adjust the energy level alignment at the interface with charge transport materials in perovskite-based optoelectronics. The impact on perovskite solar cells is reported and discussed in detail with the support of modelling.

Graphical abstract: Tuning halide perovskite energy levels

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Supplementary files

Article information


Submitted
13 Jul 2020
Accepted
15 Dec 2020
First published
16 Dec 2020

This article is Open Access

Energy Environ. Sci., 2021,14, 1429-1438
Article type
Paper

Tuning halide perovskite energy levels

L. Canil, T. Cramer, B. Fraboni, D. Ricciarelli, D. Meggiolaro, A. Singh, M. Liu, M. Rusu, C. M. Wolff, N. Phung, Q. Wang, D. Neher, T. Unold, P. Vivo, A. Gagliardi, F. De Angelis and A. Abate, Energy Environ. Sci., 2021, 14, 1429
DOI: 10.1039/D0EE02216K

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    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
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    [Original citation] - Published by The Royal Society of Chemistry.

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