Spatially Resolved Imaging on Photocarrier Generations and Band Alignments at Perovskite/PbI2 Heterointerfaces of Perovskite Solar Cells by Light-Modulated Scanning Tunneling Microscopy

Min Chuan Shih, Shao Sian Li, Cheng Hua Hsieh, Ying Chiao Wang, Hung Duen Yang, Ya Ping Chiu, Chia Seng Chang, Chun Wei Chen

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The presence of the PbI2 passivation layers at perovskite crystal grains has been found to considerably affect the charge carrier transport behaviors and device performance of perovskite solar cells. This work demonstrates the application of a novel light-modulated scanning tunneling microscopy (LM-STM) technique to reveal the interfacial electronic structures at the heterointerfaces between CH3NH3PbI3 perovskite crystals and PbI2 passivation layers of individual perovskite grains under light illumination. Most importantly, this technique enabled the first observation of spatially resolved mapping images of photoinduced interfacial band bending of valence bands and conduction bands and the photogenerated electron and hole carriers at the heterointerfaces of perovskite crystal grains. By systematically exploring the interfacial electronic structures of individual perovskite grains, enhanced charge separation and reduced back recombination were observed when an optimal design of interfacial PbI2 passivation layers consisting of a thickness less than 20 nm at perovskite crystal grains was applied.

Original languageEnglish
Pages (from-to)1154-1160
Number of pages7
JournalNano Letters
Volume17
Issue number2
DOIs
Publication statusPublished - Feb 8 2017
Externally publishedYes

Fingerprint

Scanning tunneling microscopy
Perovskite
Optical microscopy
scanning tunneling microscopy
solar cells
alignment
Imaging techniques
passivity
Passivation
Crystals
crystals
Electronic structure
electronic structure
polarization (charge separation)
Carrier transport
charge carriers
Valence bands
Conduction bands
Charge carriers
conduction bands

Keywords

  • heterointerface
  • PbI passivation layer
  • Perovskite-based solar cells
  • scanning tunneling spectroscopy

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Spatially Resolved Imaging on Photocarrier Generations and Band Alignments at Perovskite/PbI2 Heterointerfaces of Perovskite Solar Cells by Light-Modulated Scanning Tunneling Microscopy. / Shih, Min Chuan; Li, Shao Sian; Hsieh, Cheng Hua; Wang, Ying Chiao; Yang, Hung Duen; Chiu, Ya Ping; Chang, Chia Seng; Chen, Chun Wei.

In: Nano Letters, Vol. 17, No. 2, 08.02.2017, p. 1154-1160.

Research output: Contribution to journalArticle

Shih, Min Chuan ; Li, Shao Sian ; Hsieh, Cheng Hua ; Wang, Ying Chiao ; Yang, Hung Duen ; Chiu, Ya Ping ; Chang, Chia Seng ; Chen, Chun Wei. / Spatially Resolved Imaging on Photocarrier Generations and Band Alignments at Perovskite/PbI2 Heterointerfaces of Perovskite Solar Cells by Light-Modulated Scanning Tunneling Microscopy. In: Nano Letters. 2017 ; Vol. 17, No. 2. pp. 1154-1160.
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