Issue 3, 2021

Tuning halide perovskite energy levels


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

Supplementary files

Article information

Article type
13 Jul 2020
15 Dec 2020
First published
16 Dec 2020
This article is Open Access
Creative Commons BY license

Energy Environ. Sci., 2021,14, 1429-1438

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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