Lead-free molecular ferroelectric [N,N-dimethylimidazole]3Bi2I9 with narrow bandgap

Lead-based organic-inorganic hybrid perovskite materials are widely applied in solar cells due to their excellent optoelectronic properties. These materials usually appear ferroelectricity with the built-in electric field, which can be used to improve the power conversion efficiency (PCE) of solar c...

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Bibliographic Details
Published in:Materials & design 2020-08, Vol.193, p.108868, Article 108868
Main Authors: Yang, Weijie, Chu, Kai-Bin, Zhang, Lixue, Ding, Xiangdong, Sun, Jun, Liu, Jefferson Zhe, Song, Jun-Ling, Zheng, Changxi, Deng, Junkai
Format: Article
Language:English
Subjects:
Bandgap
Ferroelectrics
Organic-inorganic hybrid
Phase transitions
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Summary:Lead-based organic-inorganic hybrid perovskite materials are widely applied in solar cells due to their excellent optoelectronic properties. These materials usually appear ferroelectricity with the built-in electric field, which can be used to improve the power conversion efficiency (PCE) of solar cells. However, the toxicity of lead has severely hampered their applications. Hence, it is of utmost significance to explore novel organic-inorganic hybrid perovskite materials with non-toxicity, ferroelectricity, and narrow bandgap at room temperature to enhance the PCE for broad practical applications. Herein, we reported a lead-free hybrid molecular ferroelectric material, i.e. (C5N2H9)3Bi2I9, with zero-dimensional perovskite-like structure. (C5N2H9)3Bi2I9 undergoes first-order ferroelectric phase transition with a Curie temperature of 327 K. Moreover, the dielectric constants of (C5N2H9)3Bi2I9 exhibit a step-like anomaly varied between the high-temperature paraelectric phase and the low-temperature ferroelectric phase. Furthermore, (C5N2H9)3Bi2I9 demonstrates a narrow bandgap of 2.1 eV. Hence, the as-reported novel member of the organic-inorganic hybrid family renders great promise for optoelectronic devices. [Display omitted] •Novel organic-inorganic hybrid perovskite (C5N2H9)3Bi2I9 was synthesized.•It was designed by selecting N-methylimidazole and non-toxic metal Bi.•The material has shown a paraelectric-to-ferroelectric phase transition at 327 K.•This designed molecular ferroelectric also exhibit a narrow bandgap of 2.1 eV.
ISSN:0264-1275
1873-4197
DOI:10.1016/j.matdes.2020.108868