Overcoming Nanoscale Inhomogeneities in Thin-Film Perovskites via Exceptional Post-annealing Grain Growth for Enhanced Photodetection.
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Authors
Du, Tian
Frohna, Kyle
Mohan, Lokeshwari
Min, Ganghong
Xu, Weidong
Yuan, Haozhen
Ratnasingham, Sinclair R
Castro, Fernando A
Wood, Sebastian
Publication Date
2022-02-09Journal Title
Nano Lett
ISSN
1530-6984
Publisher
American Chemical Society (ACS)
Type
Article
This Version
AM
Metadata
Show full item recordCitation
Du, T., Richheimer, F., Frohna, K., Gasparini, N., Mohan, L., Min, G., Xu, W., et al. (2022). Overcoming Nanoscale Inhomogeneities in Thin-Film Perovskites via Exceptional Post-annealing Grain Growth for Enhanced Photodetection.. Nano Lett https://doi.org/10.1021/acs.nanolett.1c03839
Abstract
Antisolvent-assisted spin coating has been widely used for fabricating metal halide perovskite films with smooth and compact morphology. However, localized nanoscale inhomogeneities exist in these films owing to rapid crystallization, undermining their overall optoelectronic performance. Here, we show that by relaxing the requirement for film smoothness, outstanding film quality can be obtained simply through a post-annealing grain growth process without passivation agents. The morphological changes, driven by a vaporized methylammonium chloride (MACl)-dimethylformamide (DMF) solution, lead to comprehensive defect elimination. Our nanoscale characterization visualizes the local defective clusters in the as-deposited film and their elimination following treatment, which couples with the observation of emissive grain boundaries and excellent inter- and intragrain optoelectronic uniformity in the polycrystalline film. Overcoming these performance-limiting inhomogeneities results in the enhancement of the photoresponse to low-light (<0.1 mW cm-2) illumination by up to 40-fold, yielding high-performance photodiodes with superior low-light detection.
Sponsorship
The authors thank the EPSRC Plastic Electronics CDT (EP/
L016702/1) for financial support and provision of equipment
resources. J.B. and T.D. acknowledge the QMUL-EPSRC
Impact Accelerator Account for financial support. T.D.
gratefully acknowledges the Stephen and Anna Hui Scholar-
ship (Imperial College London) for financially supporting his
doctoral studies. F.R., F.A.C., and S.W. acknowledge funding
from the European Union’s Horizon 2020 research and
Innovation programme under the Marie Skłodowska-Curie
grant agreement number 721874 (SPM2.0) and from the UK
National Measurement System via the Department for
Business, Energy and Industrial Strategy. K.F. acknowledges
a George and Lilian Schiff Studentship, Winton Studentship,
the Engineering and Physical Sciences Research Council
(EPSRC) studentship, Cambridge Trust Scholarship, and
Robert Gardiner Scholarship. S.D.S. acknowledges the Royal
Society and Tata Group (UF150033). The work has received
funding from the European Research Council under the
European Union’s Horizon 2020 research and Innovation
programme (HYPERION, grant agreement no. 756962). S.D.S. acknowledges EPSRC (EP/R023980/1) for funding.
Funder references
Royal Society (UF150033)
European Research Council (756962)
Engineering and Physical Sciences Research Council (EP/R023980/1)
EPSRC (2127077)
Identifiers
External DOI: https://doi.org/10.1021/acs.nanolett.1c03839
This record's URL: https://www.repository.cam.ac.uk/handle/1810/332760
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