Giant Apparent Optical Circular Dichroism in Thin Films of Bismuth-Based Hybrid Organic-Inorganic Metal Halide Semiconductor Through Preferred Orientation: Article No. 2302766

Liang Yan, Yi Xie, David Mitzi, Peter Sercel, Alan Phillips, Jeffrey Blackburn, Wei You

Research output: Contribution to journalArticlepeer-review

1 Scopus Citations

Abstract

Introducing chirality into organic/inorganic hybrid materials can impart chiroptical properties such as circular dichroism. The ability to tune chiroptical properties in self-assembled materials can have important implications for spintronic and optoelectronic applications. Here, a chiral organic cation, (R/S)-4-methoxy-a-methylbenzylammonium, is incorporated to synthesize the bismuth-based hybrid organic-inorganic metal halide semiconductor, (R/S-MeOMePMA)BiI4. Thin films of this Bi-based compound demonstrate large chiroptical responses, with circular dichroism anisotropy (gCD) values up to ˜0.1, close to the highest value observed in another chiral metal-halide semiconductor, (R-MBA2CuCl4). Detailed investigation reveals that this large gCD in (R/S-MeOMePMA)BiI4 is caused by the apparent CD effect. Careful selection of deposition conditions and the concomitant thin-film orientation enables the control of gCD, with maximum value observed when its thin film has a well-crystallized preferred (001) orientation parallel to the substrate. The results support a growing body of evidence that low symmetry plays an important role in achieving unusually large gCD in these chiral metal-halide materials and provides design rules for achieving large chiroptical response via morphology control.
Original languageAmerican English
Number of pages10
JournalAdvanced Optical Materials
Volume12
Issue number13
DOIs
StatePublished - 2024

NREL Publication Number

  • NREL/JA-5K00-88833

Keywords

  • chiroptic response
  • hybrid organic-inorganic metal halide
  • preferred orientation

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