Sequentially Vapor-Grown Hybrid Perovskite for Planar Heterojunction Solar Cells

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Choi W., Kang D., NA S., Park C., Gokdemir F. P., MOON T.

NANOSCALE RESEARCH LETTERS, vol.13, 2018 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 13
  • Publication Date: 2018
  • Doi Number: 10.1186/s11671-017-2401-5
  • Journal Name: NANOSCALE RESEARCH LETTERS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: CH3NH3PbI3-xClx, Sequential vapor processing, Vacuum evaporation, Vapor-assisted growth, Planar Heterojunction solar cells, EFFICIENT, CH3NH3PBI3, STATE, CRYSTALLIZATION, DEPOSITION, TRANSFORMATION, TEMPERATURE, INTERFACE, UNIFORM, AIR
  • Yıldız Technical University Affiliated: Yes

Abstract

High-quality and reproducible perovskite layer fabrication routes are essential for the implementation of efficient planar solar cells. Here, we introduce a sequential vapor-processing route based on physical vacuum evaporation of a PbCl2 layer followed by chemical reaction with methyl-ammonium iodide vapor. The demonstrated vapor-grown perovskite layers show compact, pinhole-free, and uniform microstructure with the average grain size of similar to 320 nm. Planar heterojunction perovskite solar cells are fabricated using TiO2 and spiro-OMeTAD charge transporting layers in regular n-i-p form. The devices exhibit the best efficiency of 11.5% with small deviation indicating the high uniformity and reproducibility of the perovskite layers formed by this route.