Improved performance and thermal stability of perovskite solar cells prepared via a modified sequential deposition process

Seongtak Kim, Taewon Chung, Soohyun Bae, Sang Won Lee, Kyung Dong Lee, Hyunho Kim, Seunghun Lee, Yoon Mook Kang, Haeseok Lee, Donghwan Kim

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

In conventional sequential deposition, PbI2-free CH3NH3PbI3 perovskite films can be achieved when the PbI2 substrate reacts with a relatively low-concentration CH3NH3I solution (<8 mg of CH3NH3I per 1 mL of IPA) but the film that is formed has only sparse and uneven coverage. On the other hand, a dense CH3NH3PbI3 perovskite film can be formed on a mesoporous TiO2 substrate when the PbI2 substrate reacts with a relatively high-concentration MAI solution (>8 mg of CH3NH3I per 1 mL of IPA), but unreacted PbI2 is still present in CH3NH3PbI3 layer in such cases. Here, we developed organic-inorganic perovskite solar cells with high efficiency by preparing dense and PbI2-free films using a modified sequential deposition process. By utilizing the reaction behavior between PbI2 and MAI, solar cells with an average power-conversion efficiency of 15.1% and high reproducibility and stability were achieved.

Original languageEnglish
Pages (from-to)266-273
Number of pages8
JournalOrganic Electronics: physics, materials, applications
Volume41
DOIs
Publication statusPublished - 2017 Feb 1

Keywords

  • Conversion rate
  • Perovskite
  • Sequential deposition method
  • Solar cells
  • Thermal stability

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Chemistry(all)
  • Biomaterials
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

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