In recent years, organic-inorganic hybrid perovskites such as methylammonium lead halides (MAPbI3), which can increase the efficiency of solar cells, have been widely investigated owing to their low costs and simple processes of production. A new hybrid chiral material composed of (R)/(S)-1-phenylethylamine and bismuth bromide was synthesized using a mild solution chemistry method. Single crystal X-ray diffraction analysis indicates that both (R)- and (S)-configuration materials were successfully synthesized. To find applicability to photovoltaic or optoelectronic devices, the newly synthesized chiral materials were uniformly deposited on glass substrates by the spin-coating method. Powder X-ray diffraction analysis on the chiral thin films indicate that both (R)- and (S)-configuration materials reveal a strong preferred orientation along the crystallographic a-axis. We also determined the chirality of thin films through solid state circular dichroism analysis. Infrared spectra, UV-vis reflectance spectra, and second harmonic generation measurements were also performed for both polycrystalline as well as thin film samples. |
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