当前位置: X-MOL 学术J. Phys. Chem. C › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Low-Dose and Stable X-ray Detection Enabled by Ferroelectric Perovskite Oxides
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2023-03-21 , DOI: 10.1021/acs.jpcc.3c00713
Shujie Tie 1, 2 , Xiaojun Wu 2 , Yazhou Wei 1 , Ning Yang 1 , Lixu Xie 2 , Jianguo Zhu 2 , Xiaojia Zheng 1
Affiliation  

Ferroelectric perovskites are recognized as promising candidates for use in optoelectronics due to the efficient electron and hole extraction enabled by the spontaneous electric polarization induced depolarization electric field. Ferroelectric perovskite oxides also show good stability in harsh chemical, mechanical, and thermal conditions and can be fabricated by using robust and scalable methods. However, the small photocurrent of the typical ferroelectric oxide optoelectronics greatly limits their applications, such as in photovoltaics and photocatalysis. Here, we show that ferroelectric perovskite oxides are suitable for low-dose X-ray detection (ultraweak radiation detection). Ferroelectric plate-like perovskite-type CaBi2Ta2O9 (CBTa), prepared by a solid-state sintered reaction method, displays a spontaneous polarization (Ps) of 6.5 μC cm–2, a remanent polarization (Pr) of 4.9 μC cm–2, and a high Curie temperature (Tc) of 1196 K. Large resistivity and high Pr of CBTa enable a good response to low-dose X-rays under zero bias, resulting in a detection limit of 30 nGyair s–1 for the detector, which is much lower than the requirement for X-ray diagnostics (5.5 μGyair s–1). The CBTa detectors also exhibit ultralow noise and good operation stability. This study will motivate new strategies to explore low-dose and stable X-ray detectors with ferroelectric oxides.

中文翻译:

铁电钙钛矿氧化物实现低剂量和稳定的 X 射线检测

由于自发极化引起的去极化电场能够有效提取电子和空穴,因此铁电钙钛矿被认为是用于光电子学的有前途的候选者。铁电钙钛矿氧化物在恶劣的化学、机械和热条件下也表现出良好的稳定性,并且可以通过使用稳健且可扩展的方法来制造。然而,典型的铁电氧化物光电器件的小光电流极大地限制了它们在光伏和光催化等方面的应用。在这里,我们表明铁电钙钛矿氧化物适用于低剂量 X 射线检测(超弱辐射检测)。铁电板状钙钛矿型 CaBi 2 Ta 2 O 9(CBTa) 采用固态烧结反应法制备,具有6.5 μC cm –2的自发极化 ( P s )、 4.9 μC cm –2的剩余极化 ( P r )和高居里温度 ( T c ) 为 1196 K。CBTa 的大电阻率和高P r使得在零偏压下对低剂量 X 射线有良好的响应,导致探测器的检测限为 30 nGy air s –1,远低于X 射线诊断的要求(5.5 μGy空气s –1). CBTa 探测器还表现出超低噪音和良好的运行稳定性。这项研究将激发新的策略来探索低剂量和稳定的铁电氧化物 X 射线探测器。
更新日期:2023-03-21
down
wechat
bug