Journal Article

FZJ-2021-05679

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Physical Passivation of Grain Boundaries and Defects in Perovskite Solar Cells by an Isolating Thin Polymer

Ochoa-Martinez, E. ; Ochoa, M. ; Ortuso, R. D. ; Ferdowsi, P. ; Carron, R. ; Tiwari, A. N. ; Steiner, U. ; Saliba, M. (Corresponding author)FZJ*

2021
American Chemical Society Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/30273  doi:10.1021/acsenergylett.1c01187

Abstract: Passivation and interlayer engineering are important approaches to increase the efficiency and stability of perovskite solar cells. Thin insulating dielectric films at the interface between the perovskite and the charge carrier transport layers have been suggested to passivate surface defects. Here, we analyze the effect of depositing poly(methyl methacrylate) (PMMA) from a very low-concentration solution. Spatial- and time-resolved photoluminescence and atomic force microscopy analyses of samples with diverse morphologies demonstrate the preferential deposition of PMMA in topographic depressions of the perovskite layer, such as grain and domain boundaries. This treatment results in an increase in the fill factor of more than 4% and an absolute efficiency boost exceeding 1%, with a maximum efficiency of 20.4%. Based on these results, we propose a physical isolation mechanism rather than a chemical passivation of perovskite defects, which explains not only the data of this study but also most results found in earlier works.

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Contributing Institute(s):

1. Photovoltaik (IEK-5)

Research Program(s):

1. 1212 - Materials and Interfaces (POF4-121) (POF4-121)

Appears in the scientific report 2021

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 15 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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