Wide range tuning of band gap energy of A 3 B 2 X 9 perovskite-like halides

Se Yun Kim, Yeonghun Yun, Seunghak Shin, Joon Hyung Lee, Young Woo Heo, Sangwook Lee

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

We report the structural, optical, and electrical properties of A 3 B 2 X 9 halides (where A = Cs, methylammonium (MA), formamidinium (FA), or ethylammonium; B = As, Sb, or Bi; X = Cl, Br, or I). Substitution results in tuning of lattice parameters involving crystal structure change, hence tuning of band gap energy, from ~1.9 to ~3.1 eV. Our results on the band gap energy, type, and crystal structure changes by A, B and X site substitution would give very useful information to develop wide band gap light-absorbers for diverse optoelectronic applications, including highly efficient and stable tandem solar cells.

Original languageEnglish
Pages (from-to)107-111
Number of pages5
JournalScripta Materialia
Volume166
DOIs
StatePublished - Jun 2019

Keywords

  • Band gap
  • Crystal structure
  • Electrical property
  • Hybrid perovskite
  • Substitution

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