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Spatial–temporal spectroscopy characterizations and electronic structure of methylammonium perovskites

Published online by Cambridge University Press:  09 July 2018

Zhaoyu Liu ,
K. C. Bhamu ,
Liang Luo ,
Satvik Shah ,
Joong-Mok Park ,
Di Cheng ,
Men Long ,
Rana Biswas Open the ORCID record for Rana Biswas [Opens in a new window] ,
F. Fungara  and
Ruth Shinar
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Zhaoyu Liu
Affiliation:
Division of Materials Science and Engineering, Ames Laboratory, Ames, IA 50011, USA Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
K. C. Bhamu
Affiliation:
CSIR-National Chemical Laboratory, Pune 411008, Maharashtra, India
Liang Luo
Affiliation:
Division of Materials Science and Engineering, Ames Laboratory, Ames, IA 50011, USA Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
Satvik Shah
Affiliation:
Department of Electrical and Computer Engineering and Microelectronics Research Center, Iowa State University, Ames, IA 50011, USA
Joong-Mok Park
Affiliation:
Division of Materials Science and Engineering, Ames Laboratory, Ames, IA 50011, USA Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
Di Cheng
Affiliation:
Division of Materials Science and Engineering, Ames Laboratory, Ames, IA 50011, USA Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
Men Long
Affiliation:
Division of Chemical and Biological Sciences, Ames Laboratory, Ames, IA 50011, USA Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA
Rana Biswas*
Affiliation:
Division of Materials Science and Engineering, Ames Laboratory, Ames, IA 50011, USA Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
F. Fungara
Affiliation:
Division of Materials Science and Engineering, Ames Laboratory, Ames, IA 50011, USA Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
Ruth Shinar
Affiliation:
Department of Electrical and Computer Engineering and Microelectronics Research Center, Iowa State University, Ames, IA 50011, USA
Joseph Shinar
Affiliation:
Division of Materials Science and Engineering, Ames Laboratory, Ames, IA 50011, USA Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
Javier Vela
Affiliation:
Division of Chemical and Biological Sciences, Ames Laboratory, Ames, IA 50011, USA Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA
Jigang Wang*
Affiliation:
Division of Materials Science and Engineering, Ames Laboratory, Ames, IA 50011, USA Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
*
Address all correspondence to Rana Biswas, Jigang Wang at biswasr@iastate.edu, jwang@ameslab.gov
Address all correspondence to Rana Biswas, Jigang Wang at biswasr@iastate.edu, jwang@ameslab.gov
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Abstract

Using time-resolved laser-scanning confocal microscopy and ultrafast optical pump/THz probe spectroscopy, we measure photoluminescence (PL) and THz-conductivity in perovskite micro-crystals and films. PL quenching and lifetime variations occur from local heterogeneity. Ultrafast THz-spectra measure sharp quantum transitions from excitonic Rydberg states, providing weakly bound excitons with a binding energy of ~13.5 meV at low temperatures. Ab-initio electronic structure calculations give a direct band gap of 1.64 eV, a dielectric constant of ~18, heavy electrons, and light holes, resulting in weakly bound excitons, consistent with the binding energies from the experiment. The complementary spectroscopy and simulations reveal fundamental insights into perovskite light-matter interactions.

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Type
Research Letters
Information
MRS Communications , Volume 8 , Issue 3 , September 2018 , pp. 961 - 969
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Copyright
Copyright © Materials Research Society 2018 

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Footnotes

*

These authors contributed equally to this work.

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