Band-gap tuning of lead halide perovskite using a single step spin-coating deposition process

Saif M H Qaid, Mohammed S. Al Sobaie, M. A. Majeed Khan, Idriss M. Bedja, Fahhad Alharbi, Mohammad Khaja Nazeeruddin, Abdullah S. Aldwayyan

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

In this paper, we present a study of the structural and optical properties of organic-inorganic halide-based perovskite semiconductors with band gaps varying from NIR to visible at room temperature. Thin films of nanocrystalline CH3NH3PbI3 with different concentrations of methylammonium iodide (MAI) have been successfully deposited onto glass substrates using single step spin-coating technique. The prepared films have been characterized by X-ray diffraction, optical absorption spectroscopy and photoluminescence measurements. X-ray diffraction scans revealed that even for stoichiometric atomic concentrations of MA:Pb:I of 1:1:3, the PbI2 phase was also present. The PbI2 phase showed a highly textured along the (001) direction in all the prepared films, with a crystallite size in the range of approximately 30-40 nm. The optical absorbance edge of CH3NH3PbI3 thin films is described in terms of direct transition model proposed by Tauc in the strong absorption region. The band gap of the pure PbI2 film was calculated to be 2.40 eV, whereas the band gap of the pervoskite film with stoichiometric ionic ratio of 1:1 PbI2 and CH3NH3I was calculated to be 1.46 eV, while absorption coefficient is ~105 cm-1. Photoluminescence measurements showed a red shift in the perovskite emission with increasing the MAI concentration, confirming the correct placement of the MA ions in the perovskite crystalline structure showing the PbI2 octahedra. Our results confirm the existence of PbI2 phase in the highly efficient perovskite solar cells, as demonstrated in the recent publication.

Original languageEnglish
Pages (from-to)498-501
Number of pages4
JournalMaterials Letters
Volume164
DOIs
Publication statusPublished - 1 Feb 2016

Fingerprint

Spin coating
Perovskite
halides
coating
Energy gap
Tuning
Lead
tuning
Iodides
iodides
Photoluminescence
photoluminescence
X ray diffraction
Thin films
Coating techniques
Crystallite size
thin films
Absorption spectroscopy
diffraction
red shift

Keywords

  • Luminescence
  • Optical materials and properties
  • Organic-inorganic perovskite
  • Thin films
  • X-ray techniques

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Qaid, S. M. H., Al Sobaie, M. S., Majeed Khan, M. A., Bedja, I. M., Alharbi, F., Nazeeruddin, M. K., & Aldwayyan, A. S. (2016). Band-gap tuning of lead halide perovskite using a single step spin-coating deposition process. Materials Letters, 164, 498-501. https://doi.org/10.1016/j.matlet.2015.10.135

Band-gap tuning of lead halide perovskite using a single step spin-coating deposition process. / Qaid, Saif M H; Al Sobaie, Mohammed S.; Majeed Khan, M. A.; Bedja, Idriss M.; Alharbi, Fahhad; Nazeeruddin, Mohammad Khaja; Aldwayyan, Abdullah S.

In: Materials Letters, Vol. 164, 01.02.2016, p. 498-501.

Research output: Contribution to journalArticle

Qaid, SMH, Al Sobaie, MS, Majeed Khan, MA, Bedja, IM, Alharbi, F, Nazeeruddin, MK & Aldwayyan, AS 2016, 'Band-gap tuning of lead halide perovskite using a single step spin-coating deposition process', Materials Letters, vol. 164, pp. 498-501. https://doi.org/10.1016/j.matlet.2015.10.135
Qaid, Saif M H ; Al Sobaie, Mohammed S. ; Majeed Khan, M. A. ; Bedja, Idriss M. ; Alharbi, Fahhad ; Nazeeruddin, Mohammad Khaja ; Aldwayyan, Abdullah S. / Band-gap tuning of lead halide perovskite using a single step spin-coating deposition process. In: Materials Letters. 2016 ; Vol. 164. pp. 498-501.
@article{f62e805938b5407b9c44cfae3d46a844,
title = "Band-gap tuning of lead halide perovskite using a single step spin-coating deposition process",
abstract = "In this paper, we present a study of the structural and optical properties of organic-inorganic halide-based perovskite semiconductors with band gaps varying from NIR to visible at room temperature. Thin films of nanocrystalline CH3NH3PbI3 with different concentrations of methylammonium iodide (MAI) have been successfully deposited onto glass substrates using single step spin-coating technique. The prepared films have been characterized by X-ray diffraction, optical absorption spectroscopy and photoluminescence measurements. X-ray diffraction scans revealed that even for stoichiometric atomic concentrations of MA:Pb:I of 1:1:3, the PbI2 phase was also present. The PbI2 phase showed a highly textured along the (001) direction in all the prepared films, with a crystallite size in the range of approximately 30-40 nm. The optical absorbance edge of CH3NH3PbI3 thin films is described in terms of direct transition model proposed by Tauc in the strong absorption region. The band gap of the pure PbI2 film was calculated to be 2.40 eV, whereas the band gap of the pervoskite film with stoichiometric ionic ratio of 1:1 PbI2 and CH3NH3I was calculated to be 1.46 eV, while absorption coefficient is ~105 cm-1. Photoluminescence measurements showed a red shift in the perovskite emission with increasing the MAI concentration, confirming the correct placement of the MA ions in the perovskite crystalline structure showing the PbI2 octahedra. Our results confirm the existence of PbI2 phase in the highly efficient perovskite solar cells, as demonstrated in the recent publication.",
keywords = "Luminescence, Optical materials and properties, Organic-inorganic perovskite, Thin films, X-ray techniques",
author = "Qaid, {Saif M H} and {Al Sobaie}, {Mohammed S.} and {Majeed Khan}, {M. A.} and Bedja, {Idriss M.} and Fahhad Alharbi and Nazeeruddin, {Mohammad Khaja} and Aldwayyan, {Abdullah S.}",
year = "2016",
month = "2",
day = "1",
doi = "10.1016/j.matlet.2015.10.135",
language = "English",
volume = "164",
pages = "498--501",
journal = "Materials Letters",
issn = "0167-577X",
publisher = "Elsevier",

}

TY - JOUR

T1 - Band-gap tuning of lead halide perovskite using a single step spin-coating deposition process

AU - Qaid, Saif M H

AU - Al Sobaie, Mohammed S.

AU - Majeed Khan, M. A.

AU - Bedja, Idriss M.

AU - Alharbi, Fahhad

AU - Nazeeruddin, Mohammad Khaja

AU - Aldwayyan, Abdullah S.

PY - 2016/2/1

Y1 - 2016/2/1

N2 - In this paper, we present a study of the structural and optical properties of organic-inorganic halide-based perovskite semiconductors with band gaps varying from NIR to visible at room temperature. Thin films of nanocrystalline CH3NH3PbI3 with different concentrations of methylammonium iodide (MAI) have been successfully deposited onto glass substrates using single step spin-coating technique. The prepared films have been characterized by X-ray diffraction, optical absorption spectroscopy and photoluminescence measurements. X-ray diffraction scans revealed that even for stoichiometric atomic concentrations of MA:Pb:I of 1:1:3, the PbI2 phase was also present. The PbI2 phase showed a highly textured along the (001) direction in all the prepared films, with a crystallite size in the range of approximately 30-40 nm. The optical absorbance edge of CH3NH3PbI3 thin films is described in terms of direct transition model proposed by Tauc in the strong absorption region. The band gap of the pure PbI2 film was calculated to be 2.40 eV, whereas the band gap of the pervoskite film with stoichiometric ionic ratio of 1:1 PbI2 and CH3NH3I was calculated to be 1.46 eV, while absorption coefficient is ~105 cm-1. Photoluminescence measurements showed a red shift in the perovskite emission with increasing the MAI concentration, confirming the correct placement of the MA ions in the perovskite crystalline structure showing the PbI2 octahedra. Our results confirm the existence of PbI2 phase in the highly efficient perovskite solar cells, as demonstrated in the recent publication.

AB - In this paper, we present a study of the structural and optical properties of organic-inorganic halide-based perovskite semiconductors with band gaps varying from NIR to visible at room temperature. Thin films of nanocrystalline CH3NH3PbI3 with different concentrations of methylammonium iodide (MAI) have been successfully deposited onto glass substrates using single step spin-coating technique. The prepared films have been characterized by X-ray diffraction, optical absorption spectroscopy and photoluminescence measurements. X-ray diffraction scans revealed that even for stoichiometric atomic concentrations of MA:Pb:I of 1:1:3, the PbI2 phase was also present. The PbI2 phase showed a highly textured along the (001) direction in all the prepared films, with a crystallite size in the range of approximately 30-40 nm. The optical absorbance edge of CH3NH3PbI3 thin films is described in terms of direct transition model proposed by Tauc in the strong absorption region. The band gap of the pure PbI2 film was calculated to be 2.40 eV, whereas the band gap of the pervoskite film with stoichiometric ionic ratio of 1:1 PbI2 and CH3NH3I was calculated to be 1.46 eV, while absorption coefficient is ~105 cm-1. Photoluminescence measurements showed a red shift in the perovskite emission with increasing the MAI concentration, confirming the correct placement of the MA ions in the perovskite crystalline structure showing the PbI2 octahedra. Our results confirm the existence of PbI2 phase in the highly efficient perovskite solar cells, as demonstrated in the recent publication.

KW - Luminescence

KW - Optical materials and properties

KW - Organic-inorganic perovskite

KW - Thin films

KW - X-ray techniques

UR - http://www.scopus.com/inward/record.url?scp=84959469702&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84959469702&partnerID=8YFLogxK

U2 - 10.1016/j.matlet.2015.10.135

DO - 10.1016/j.matlet.2015.10.135

M3 - Article

AN - SCOPUS:84959469702

VL - 164

SP - 498

EP - 501

JO - Materials Letters

JF - Materials Letters

SN - 0167-577X

ER -