Evidence of Tailoring the Interfacial Chemical Composition in Normal Structure Hybrid Organohalide Perovskites by a Self-Assembled Monolayer

Will J, Hou Y, Scheiner S, Pinkert U, Hermes IM, Weber SA, Hirsch A, Halik M, Brabec C, Unruh T (2018)

Publication Language: English

Publication Type: Journal article, Original article

Publication year: 2018

Journal

ACS Applied Materials and Interfaces American Chemical Society

Book Volume: 10

Pages Range: 5511-5518

Journal Issue: 6

URI: https://pubs.acs.org/doi/abs/10.1021/acsami.7b15904

DOI: 10.1021/acsami.7b15904

Abstract

Current-voltage hysteresis is a major issue for normal architecture organo-halide perovskite
solar cells. In this manuscript we reveal a several Å thick Methylammonium Iodide (MAI) rich
interface between the perovskite and the metal oxide. Surface functionalization via selfassembled
monolayers (SAMs) allowed us to control the composition of the interface
monolayer from Pb poor to Pb rich, which in parallel suppresses hysteresis in perovskite
solar cells. The bulk of the perovskite films is not affected by the interface engineering and
remains highly crystalline in surface normal direction over the whole film thickness. The subnm
structural modifications of the buried interface were revealed by x-ray reflectivity (XRR),
which is most sensitive to monitor changes in the mass density of only several Å thin
interfacial layers as a function of substrate functionalization. From Kelvin probe force
microscopy (KPFM) on a solar cell cross section study, we further demonstrate local
variations of the potential on different electron transporting layers (ETLs) within a solar cell.
Based on these findings we present a unifying model explaining hysteresis in perovskite solar
cells, giving for the first time insight into one crucial aspect of hysteresis and paving the way
for new strategies in the fields of perovskite based opto-electronic devices.

Authors with CRIS profile

Johannes Will Lehrstuhl für Kristallographie und Strukturphysik Yi Hou Institute Materials for Electronics and Energy Technology (i-MEET) Simon Scheiner Professur für Werkstoffwissenschaften (Polymerwerkstoffe) Ute Pinkert Lehrstuhl für Organische Chemie II Andreas Hirsch Lehrstuhl für Organische Chemie II Marcus Halik Professur für Werkstoffwissenschaften (Polymerwerkstoffe) Christoph Brabec Institute Materials for Electronics and Energy Technology (i-MEET) Tobias Unruh Professur für Nanomaterialcharakterisierung (Streumethoden)

Additional Organisation(s)

Graduiertenkolleg 1896/2 In situ Mikroskopie mit Elektronen, Röntgenstrahlen und Rastersonden Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)

Involved external institutions

Max-Planck-Institut für Polymerforschung (MPI-P) / Max Planck Institute for Polymer Research DE Germany (DE)

How to cite

APA:

Will, J., Hou, Y., Scheiner, S., Pinkert, U., Hermes, I.M., Weber, S.A.,... Unruh, T. (2018). Evidence of Tailoring the Interfacial Chemical Composition in Normal Structure Hybrid Organohalide Perovskites by a Self-Assembled Monolayer. ACS Applied Materials and Interfaces, 10(6), 5511-5518. https://dx.doi.org/10.1021/acsami.7b15904

MLA:

Will, Johannes, et al. "Evidence of Tailoring the Interfacial Chemical Composition in Normal Structure Hybrid Organohalide Perovskites by a Self-Assembled Monolayer." ACS Applied Materials and Interfaces 10.6 (2018): 5511-5518.

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