Apr 9, 2025
11:00am - 11:15am
Summit, Level 4, Room 437
Jiamin Amanda Ong1,2,3,Yun Li1,3,Moria-Ahuva Lighthouse2,Xiaodong Chen1,3,Pooi See Lee1,3,Lioz Etgar2,3
Nanyang Technological University1,The Hebrew University of Jerusalem2,Campus for Research Excellence and Technological Enterprise (CREATE)3
Jiamin Amanda Ong1,2,3,Yun Li1,3,Moria-Ahuva Lighthouse2,Xiaodong Chen1,3,Pooi See Lee1,3,Lioz Etgar2,3
Nanyang Technological University1,The Hebrew University of Jerusalem2,Campus for Research Excellence and Technological Enterprise (CREATE)3
Halide perovskites possess excellent piezoelectric property due to their unique structure, of which, lead-based halide perovskites were heavily studied due to their excellent performances. However, in recent years, there is an advocation for an alternative to replace lead due to their high toxicity and sensitivity to moisture. Despite the intensive research work invested, the performances of lead-free halide perovskite are still not up to par with their lead-based counterparts. To expand the possibility of materials, research has also been extended to halide double perovskites. One of the highly investigated halide double perovskites, Cs
2AgBiBr
6, was recently reported to exhibit piezoelectric property, which its performance still fell below the lead-based counterparts. As a result, a reduction of the dimensionality of the halide double perovskite was suggested to enhance the symmetry breaking, thus inducing piezoelectric polarization. Herein, to synthesize Ruddlesden-Popper (RP) and Dion-Jacobson (DJ) 2D perovskite, four different barrier molecules (3-bromopropylamine, n-butylamine, phenylethylamine, and butyl diamine) were employed. For the first time, piezoelectricity was demonstrated in 2D lead-free halide double perovskite. It was observed that butyl diamine (BDA) has outperformed its 3D counterpart, with an outstanding piezoelectric coefficient (
d33) of 40.3 pm/V, and fast response time of 23 ms in a pressure sensor device. Therefore, this work serves as a stepping stone for new generation of lead-free perovskite piezoelectric material, which can be assembled as a piezoelectric sensor for flexible devices and soft sensors.