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具有自供电宽带光电探测功能的软多轴分子铁电薄膜
作者:小柯机器人 发布时间:2022/10/31 13:30:28

中科院福建物构所罗军华团队报道了具有自供电宽带光电探测功能的软多轴分子铁电薄膜。相关研究成果发表在2022年10月28日出版的国际学术期刊《美国化学会杂志》。

分子铁电薄膜(MFFs)为小型电子器件提供了一个良好的平台,而小型电子器件与其多轴特性密不可分。尽管进行了大量研究,但具有宽带光电活性的软MFFs仍然是一个巨大的空白,因为光激发漏电流将严重恶化铁电性,阻碍其光电应用。

该文中,研究人员在2D多层钙钛矿中构建了HA2EA2Pb3I10(1,其中EA=乙基铵,HA=正己基铵)的多轴MFF。在1中观察到8个等效极化方向,这是2D多层钙钛矿中的最大值,甚至比经典陶瓷BaTiO3的更大,并通过其对称性破坏(即4/mmmFm物种)进行了验证。特别地,自旋包覆的柔性MFF大致平行于层状钙钛矿骨架去向,表现出面内自发极化(Ps=1.8μC/cm2)和宽带吸收(~1.83eV)。此外,在软膜上实现了自供电宽带检测(637nm光照下为~0.55μA/cm2),显示了其在柔性和可穿戴电子设备中的潜力。

研究结果为柔性光电子器件的设计提供了依据,并为扩展2D分子铁电材料的应用提供了有效途径。

附:英文原文

Title: Soft Multiaxial Molecular Ferroelectric Thin Films with Self-Powered Broadband Photodetection

Author: Shiguo Han, Yu Ma, Lina Hua, Liwei Tang, Beibei Wang, Zhihua Sun, Junhua Luo

Issue&Volume: October 28, 2022

Abstract: Molecular ferroelectric films (MFFs) offer a good platform for miniaturized electronic devices, which are inseparable from their multiaxial nature. Despite great studies, soft MFFs with broadband photo-electroactivity still remain a huge blank as the photoexcited leakage current will severely deteriorate ferroelectricity, hindering their optoelectronic applications. Here, we constructed the multiaxial MFF of HA2EA2Pb3I10 (1, where EA = ethylammonium and HA = n-hexylammonium) in 2D multilayered perovskites. Eight equivalent polarization directions were observed in 1, as verified by its symmetry breaking (i.e., 4/mmmFm species), which is the maximum among 2D multilayered perovskites and even more than that of classic ceramic BaTiO3. Specially, spin-coated flexible MFFs of 1 are approximately orientated parallel to layered perovskite frameworks, exhibiting in-plane spontaneous polarization (Ps = 1.8 μC/cm2) and broadband absorption (~1.83 eV). In addition, self-powered broadband detection (~0.55 μA/cm2 at 637 nm illumination) was achieved on the soft films, revealing their potential for flexible and wearable electronic devices. Our result sheds light on the design of flexible photoelectronic devices and provides an effective way to expand the applications of 2D molecular ferroelectric materials.

DOI: 10.1021/jacs.2c07892

Source: https://pubs.acs.org/doi/10.1021/jacs.2c07892

 

期刊信息

JACS:《美国化学会志》,创刊于1879年。隶属于美国化学会,最新IF:14.612
官方网址:https://pubs.acs.org/journal/jacsat
投稿链接:https://acsparagonplus.acs.org/psweb/loginForm?code=1000