Comparative study on the excitons in lead-halide-based perovskite-type crystals CH3NH3PbBr3 CH3NH3PbI3

✍ Scribed by Kenichiro Tanaka; Takayuki Takahashi; Takuma Ban; Takashi Kondo; Kazuhito Uchida; Noboru Miura

• Book ID: 104166301
• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 156 KB
• Volume: 127
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/s0038-1098(03)00566-0

✦ Synopsis

Optical absorption and magnetoabsorption spectra of the lead-halide-based perovskite-type crystals, CH 3 NH 3 PbX 3 (X ¼ Br, I) have been investigated. The lowest-energy excitons in these crystals are normal three-dimensional Wannier-type excitons. Bohr radii, binding energies, reduced masses, effective g factors, and oscillator strengths of the excitons have been determined with satisfactory accuracy. A larger bandgap and more tightly bound nature of the excitons in CH 3 NH 3 PbBr 3 compared to those in CH 3 NH 3 PbI 3 are a natural consequence of the halogen substitution.