Switching between spectral broadening and narrowing of the exciton absorption band of a CH3NH3PbI3film on altering the polarity of an applied electric field

Kamlesh Awasthi, Kannankutty Kala, Shailesh Rana, Wei-Guang Diau*, Nobuhiro Ohta

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Electric field-induced broadening and narrowing of an exciton absorption band have been observed to depend on the polarity of the applied electric field for methylammonium lead triiodide perovskite (MAPbI3) as a thin film sandwiched between a conducting film of fluorine-doped tin oxide (FTO) and an insulating film of poly(methyl methacrylate) (PMMA). The width of the absorption band increased or decreased when the direction of the applied field was toward FTO or PMMA, respectively, indicating that the spectral broadening and narrowing become switchable on altering the direction of the applied electric field. When titanium oxide (TiO2) in a compact layer was introduced between the MAPbI3 and FTO layers, the linear electric field effect that depended on the polarity was either not observed or decreased significantly although the quadratic field effects on the exciton absorption band were similarly observed with or without the TiO2 layer.

Original languageEnglish
Article number251101
JournalApplied Physics Letters
Volume116
Issue number25
DOIs
StatePublished - 22 Jun 2020

Fingerprint Dive into the research topics of 'Switching between spectral broadening and narrowing of the exciton absorption band of a CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub>film on altering the polarity of an applied electric field'. Together they form a unique fingerprint.

Cite this