Unraveling the antisolvent dripping delay effect on the Stranski-Krastanov growth of CH3 NH3 PbBr3 thin films: a facile route for preparing a textured morphology with improved optoelectronic properties

Physical Chemistry Chemical Physics : PCCP
Jitendra KumarMonojit Bag

Abstract

Inorganic-organic hybrid perovskite materials have been a topic of interest for the last few years due to their superior optoelectronic properties. However, the optical properties of perovskite materials are strongly dependent on the film morphology. A textured film morphology is expected to have higher light absorption as well as light out-coupling efficiency compared to a smooth film. There have been numerous methods for controlling and optimizing the film morphology to achieve high efficiency in solar cells and light emitting diodes. Here we have demonstrated that controlled anti-solvent treatment at low temperature can lead to Stranski-Krastanov growth in CH3NH3PbBr3 thin films with superior optical and electronic properties for light emitting diode applications. We have studied their photoluminescence properties at the micro- to nano-scale via fluorescence microscopy, hyper-spectral imaging and scanning near-field optical microscopy. We have demonstrated that the nanostructured micro-islands are highly emissive because of large quasi-Fermi level splitting (QFLS) due to the localization of free charges in the smaller crystals. We have shown that the photoluminescence as well as electroluminescence can be improved by at leas...Continue Reading

References

Aug 4, 2015·Scientific Reports·Carlo MottaStefano Sanvito
Sep 8, 2015·Physical Chemistry Chemical Physics : PCCP·Yuxi TianIvan G Scheblykin
Dec 15, 2015·Accounts of Chemical Research·Michael B Johnston, Laura M Herz
Jun 28, 2016·Physical Chemistry Chemical Physics : PCCP·Swee Sien LimTze Chien Sum
Nov 4, 2016·The Journal of Physical Chemistry Letters·Mohnish PandeyKristian S Thygesen
Feb 9, 2017·Physical Chemistry Chemical Physics : PCCP·Mengjin YangKai Zhu
Jul 19, 2019·The Journal of Physical Chemistry Letters·Ayala V CohenLeeor Kronik
Oct 22, 2019·Advanced Materials·Christian M WolffDieter Neher
May 7, 2020·Physical Chemistry Chemical Physics : PCCP·Priya Srivastava, Monojit Bag

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Citations

Mar 27, 2021·Nature Communications·Alexander D TaylorYana Vaynzof

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Methods Mentioned

BETA
scanning
atomic force microscopy
AFM
fluorescence microscopy
optical microscopy

Software Mentioned

SNOM

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