Bifunctional Design of Ferroelectric-Order and Band-Engineering in Cu:KTN Crystal for Extended Self-Powered Photoelectric Response

IF 14.3 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Yaqian Wang, Yabo Wu, Fei Liang, Xuping Wang, Haohai Yu, Huaijin Zhang, Yicheng Wu
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Abstract

Photoelectric conversion in ferroelectric crystals can support many important applications in modern on-chip technology, but suffering from two problems, low responsive current and narrow responsive range. Especially, wide-gap ferroelectric oxides are only active at short-wavelength ultraviolet region with weak photocurrent at nanoampere levels. Here, a bifunctional design strategy of ferroelectric-order and electronic-band to improve the photocurrent and extend the responsive range simultaneously, is proposed. In a Cu-doped KTa1−xNbxO3 (KTN) perovskite crystal, a conductive channel is constructed by “head-to-head” ferroelectric domains, associated with the emergence of micrometer-scale supercells. In addition, the introduction of Cu+ ion can induce defect levels, thus extending the responsive range beyond the inherent absorption of pure KTN. Through rational device optimization, a record self-powered responsivity of 5.23 mA W−1 is realized in Cu:KTN photodetector, which is two orders of magnitude higher than undoped KTN crystal. The temperature-dependent light diffraction and photocurrent show that the ferroelectric-order is dominated in this photoresponse behavior. Moreover, Cu:KTN detector is active in the broadband range from 390 to 1030 nm, covering ultraviolet, visible, and near-infrared regions. This work provides an effective method for the design of next-generation self-powered photodetectors with ultrahigh responsivity and ultrawide responsive range.

Abstract Image

扩展自供电光电响应的Cu:KTN晶体铁电序和带工程双功能设计。
铁电晶体的光电转换可以支持现代片上技术的许多重要应用,但存在响应电流低和响应范围窄两个问题。特别是,宽间隙铁电氧化物仅在具有纳米安培弱光电流的短波紫外光区有活性。本文提出了一种铁电阶和电子带双功能设计策略,以同时提高光电流和扩展响应范围。在cu掺杂的KTa1- xNbxO3 (KTN)钙钛矿晶体中,通过“头对头”铁电畴构建了导电通道,并伴有微米级超级电池的出现。此外,Cu+离子的引入可以诱导缺陷能级,从而扩大了响应范围,超出了纯KTN的固有吸收。通过合理的器件优化,Cu:KTN光电探测器实现了创纪录的5.23 mA W-1自供电响应,比未掺杂的KTN晶体提高了两个数量级。随温度变化的光衍射和光电流表明,铁电序在这种光响应行为中占主导地位。此外,Cu:KTN探测器在390 ~ 1030 nm的宽带范围内有效,覆盖了紫外、可见光和近红外区域。该工作为设计具有超高响应率和超宽响应范围的下一代自供电光电探测器提供了有效的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Advanced Science
Advanced Science CHEMISTRY, MULTIDISCIPLINARYNANOSCIENCE &-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
18.90
自引率
2.60%
发文量
1602
审稿时长
1.9 months
期刊介绍: Advanced Science is a prestigious open access journal that focuses on interdisciplinary research in materials science, physics, chemistry, medical and life sciences, and engineering. The journal aims to promote cutting-edge research by employing a rigorous and impartial review process. It is committed to presenting research articles with the highest quality production standards, ensuring maximum accessibility of top scientific findings. With its vibrant and innovative publication platform, Advanced Science seeks to revolutionize the dissemination and organization of scientific knowledge.
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