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Updated: Sep 25, 2025

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
Published on: September 8, 2017
Methylpiperazine based 0D chiral hybrid lead halides for second harmonic generation
Xiaodi Jia1, Yongshen Zheng1, Puxin Cheng1
1School of Materials Science and Engineering, National Institute for Advanced Materials, Nankai University, Tongyan Road 38, Tianjin 300350, P. R. China. jialiang.xu@nankai.edu.cn.
Researchers developed new chiral hybrid organic-inorganic metal halides (HOMHs) for nonlinear optics (NLO). These stable materials exhibit strong second harmonic generation, indicating potential for advanced photonic devices.
Area of Science:
- Materials Science
- Optoelectronics
- Crystallography
Background:
- Hybrid organic-inorganic metal halides (HOMHs) are explored for optoelectronic applications.
- Chiral HOMHs are of interest for second-order nonlinear optics (NLO) due to noncentrosymmetric structures.
Purpose of the Study:
- Synthesize novel chiral HOMHs using chiral amines.
- Investigate their structural, optical, and NLO properties.
- Assess their stability for potential photonic device applications.
Main Methods:
- Synthesis of (S-/R-2-C5H14N2)2PbI6 using S-/R-2-methylpiperazine.
- Characterization using circular dichroism (CD) spectroscopy.
- Evaluation of optical band gap, phase purity, and stability.
- Measurement of second harmonic generation (SHG) and laser damage threshold.
Main Results:
- Two new chiral HOMHs, (S-/R-2-C5H14N2)2PbI6, were successfully synthesized.
- Materials exhibit a band gap near 2.9 eV, high phase purity, and good environmental/thermal stability.
- Chiral optical properties confirmed by CD spectroscopy.
- Strong second harmonic generation response and a high laser damage threshold (~2.97 mJ cm-2) were observed.
Conclusions:
- The synthesized chiral HOMHs possess desirable properties for NLO applications.
- These materials demonstrate potential for use in advanced NLO photonic devices.
- The study highlights the role of chiral organic cations in tailoring HOMH properties for NLO applications.
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