Strain mediated bandgap reduction, light spectrum broadening, and carrier mobility enhancement of methylammonium lead/tin iodide perovskites

Jiao, Yalong and Ma, Fengxian and Wang, Hongxia and Bell, John and Du, Aijun (2017) Strain mediated bandgap reduction, light spectrum broadening, and carrier mobility enhancement of methylammonium lead/tin iodide perovskites. Particle and Particle Systems Characterization, 34 (4):1600288. ISSN 0934-0866


Abstract

Density functional theory calculations are performed to study the electronic and optical properties of methylammonium lead/tin iodide perovskites under hydrostatic strain. It is found that the bandgap is significantly reduced to only 80/14 meV in lead/tin iodide perovskites under a moderate −6%/−4% strain. Such bandgap narrowing consequently induces the redshift of light absorption spectrum of the perovskite material by extending the onset light absorption edge by 200 meV. Additionally, applying external strain is also found to lighten the electron effective mass for CH3NH3PbI3/CH3NH3SnI3, thus enhancing the carrier mobility which benefits the collection of photogenerated charge carriers.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Research and Innovation Division (12 Jul 2012 -)
Faculty/School / Institute/Centre: Current - Research and Innovation Division (12 Jul 2012 -)
Date Deposited: 11 Sep 2020 01:22
Last Modified: 24 Sep 2020 06:19
Uncontrolled Keywords: band structure; DFT calculations; light absorption; perovskites; strain
Fields of Research (2008): 09 Engineering > 0904 Chemical Engineering > 090499 Chemical Engineering not elsewhere classified
Identification Number or DOI: https://doi.org/10.1002/ppsc.201600288
URI: http://eprints.usq.edu.au/id/eprint/39366

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