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Related Concept Videos

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films08:12

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Halogens03:01

Halogens

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Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group. 
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Related Experiment Video

Updated: Jan 20, 2026

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Published on: September 8, 2017

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Halogenated-Methylammonium Based 3D Halide Perovskites.

Sheng Huang1, Peng Huang1, Lei Wang1

  • 1Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.

Advanced Materials (Deerfield Beach, Fla.)
|September 7, 2019
PubMed
Summary

New halogenated-methylammonium cations expand hybrid perovskite options for optoelectronics. These novel perovskites demonstrate enhanced thermal stability and tunable blue-to-green light emission, paving the way for advanced device applications.

Keywords:
3Dhalogenated-methylammoniumnew A-sitesperovskites

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Optoelectronics

Background:

  • 3D perovskites (ABX3 structure) are crucial for high-performance optoelectronic devices.
  • A-site cation variation is key for enhanced properties but limited to methylamine, formamidine, and cesium.

Purpose of the Study:

  • To develop novel halogenated-methylammonium cations for hybrid perovskites.
  • To broaden the range of available A-site cations in perovskite materials.
  • To explore new perovskite alternatives for optoelectronic device applications.

Main Methods:

  • Synthesis of single crystals and colloidal nanocrystals of halogenated-methylammonium-based perovskites.
  • Characterization of material properties, including thermal stability and optical emission.

Main Results:

  • Successful synthesis of novel halogenated-methylammonium perovskites in both single crystal and nanocrystal forms.
  • Demonstrated improved thermal stability and low exciton binding energy in single crystals.
  • Achieved bright, tunable emission spanning from blue to green in colloidal nanocrystals.

Conclusions:

  • Halogenated-methylammonium cations represent a promising new class of materials for hybrid perovskites.
  • These novel perovskites offer enhanced stability and tunable optical properties.
  • The developed materials show significant potential for future optoelectronic device exploration.