Spatial Distribution of Lead Iodide and Local Passivation on Organo-Lead Halide Perovskite

Sheng Chen, Xiaoming Wen, Jae S. Yun, Shujuan Huang, Martin Green, Nam Joong Jeon, Woon Seok Yang, Jun Hong Noh, Jangwon Seo, Sang Il Seok, Anita Ho-Baillie

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We identify nanoscale spatial distribution of PbI 2 on the (FAPbI 3 ) 0.85 (MAPbBr 3 ) 0.15 perovskite thin film and investigate the local passivation effect using confocal based optical microscopy of steady state and time-resolved photoluminescence (PL). Different from a typical scanning electron microscope (SEM) morphology study, confocal based PL spectroscopy and microscopy allow researchers to map the morphologies of both perovskite and PbI 2 grains simultaneously, by selectively detecting their characteristic fluorescent bands using band-pass filters. In this work, we compare the perovskite samples without and with excess PbI 2 incorporation and unambiguously reveal PbI 2 distribution for the PbI 2 -rich sample. In addition, using the nanoscale time-resolved PL technique we show that the PbI 2 -rich regions exhibit longer lifetime due to suppressed defect trapping, compared to the PbI 2 -poor regions. The measurement on the PbI 2 -rich sample indicates that the passivation effect of PbI 2 in perovskite film is effective, especially in localized regions. Hence, this finding is important for further improvement of the solar cells by considering the strategy of excess PbI 2 incorporation.

Original languageEnglish
Pages (from-to)6072-6078
Number of pages7
JournalACS Applied Materials and Interfaces
Volume9
Issue number7
DOIs
Publication statusPublished - 2017 Feb 22
Externally publishedYes

Fingerprint

Iodides
Passivation
Perovskite
Spatial distribution
Lead
Photoluminescence
Photoluminescence spectroscopy
Bandpass filters
Optical microscopy
Solar cells
Microscopic examination
Electron microscopes
Scanning
Thin films
Defects
perovskite

Keywords

  • lifetime
  • nanoscale
  • passivation
  • PbI
  • perovskite

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Chen, S., Wen, X., Yun, J. S., Huang, S., Green, M., Jeon, N. J., ... Ho-Baillie, A. (2017). Spatial Distribution of Lead Iodide and Local Passivation on Organo-Lead Halide Perovskite. ACS Applied Materials and Interfaces, 9(7), 6072-6078. https://doi.org/10.1021/acsami.6b15504

Spatial Distribution of Lead Iodide and Local Passivation on Organo-Lead Halide Perovskite. / Chen, Sheng; Wen, Xiaoming; Yun, Jae S.; Huang, Shujuan; Green, Martin; Jeon, Nam Joong; Yang, Woon Seok; Noh, Jun Hong; Seo, Jangwon; Seok, Sang Il; Ho-Baillie, Anita.

In: ACS Applied Materials and Interfaces, Vol. 9, No. 7, 22.02.2017, p. 6072-6078.

Research output: Contribution to journalArticle

Chen, S, Wen, X, Yun, JS, Huang, S, Green, M, Jeon, NJ, Yang, WS, Noh, JH, Seo, J, Seok, SI & Ho-Baillie, A 2017, 'Spatial Distribution of Lead Iodide and Local Passivation on Organo-Lead Halide Perovskite', ACS Applied Materials and Interfaces, vol. 9, no. 7, pp. 6072-6078. https://doi.org/10.1021/acsami.6b15504
Chen, Sheng ; Wen, Xiaoming ; Yun, Jae S. ; Huang, Shujuan ; Green, Martin ; Jeon, Nam Joong ; Yang, Woon Seok ; Noh, Jun Hong ; Seo, Jangwon ; Seok, Sang Il ; Ho-Baillie, Anita. / Spatial Distribution of Lead Iodide and Local Passivation on Organo-Lead Halide Perovskite. In: ACS Applied Materials and Interfaces. 2017 ; Vol. 9, No. 7. pp. 6072-6078.
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