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A molecular ferroelectric thin film of imidazolium perchlorate on silicon.

Congqin ZhengXin LiWei LiTiantian ChenFu LvYuhui HuangQian LiYongjun WuZijian Hong
Published in: Nature communications (2024)
Molecular ferroelectrics have garnered significant attention due to their structural tunability, low synthesis temperature, and high flexibility. Herein, we successfully synthesized imidazole perchlorate (ImClO 4 ) single crystals and high-quality, highly-oriented thin films on Si substrates. These films demonstrated a high inverse piezoelectric coefficient of 55.7 pm/V. Two types of domain bands were observed: type-I bands tilted ~60 ° relative to the horizontal axis, and type-II bands positioned perpendicular to the horizontal axis. Under a + 20 V bias, type-I bands showed a reduction and detachment of 180 ° domain walls to form a needle-like domain. It extended toward the band boundary after applying -20 V bias, which grew along the boundary upon contact. In contrast, type-II bands showed straight domain wall motion and displayed a higher piezoresponse than type-I bands. The growth of  high quality molecular ferroelectric thin films on Si substrates paves the way for the development of on-chip devices.
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