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

Materials & Design

Changxi Zheng¹  Jefferson Zhe Liu²  Junkai Deng³  Jun-Ling Song⁴  Kai-Bin Chu⁴  Weijie Yang⁵  Lixue Zhang⁵  Jun Sun⁵  Xiangdong Ding⁵ 

[1] Corresponding authors.;Department of Mechanical Engineering, The University of Melbourne, Parkville, VIC 3010, Australia;;Institute of Natural Sciences, Westlake Institute for Advanced Study, &International Joint Research Center for Photoresponsive Molecules and Materials, School of Chemical and Material Engineering, Jiangnan University, Lihu Street 1800, Wuxi 214122, China;State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China;

关键词: Organic-inorganic hybrid;    Ferroelectrics;    Bandgap;    Phase transitions;   

DOI  :  

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown