Thomas Alphi Maria, Yoon Chongsei, Ippili Swathi, Jella Venkatraju, Yang Tae-Youl, Yoon Giwan, Yoon Soon-Gil
Department of Materials Science and Engineering, Chungnam National University, Daeduk Science Town, 34134 Daejeon, Republic of Korea.
School of Electrical Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea.
ACS Appl Mater Interfaces. 2021 Dec 29;13(51):61434-61446. doi: 10.1021/acsami.1c19313. Epub 2021 Dec 15.
Recent studies have focused on the development of efficient, flexible, and highly sensitive ultraviolet photodetectors (UV PDs) with various wide band-gap materials. In the present study, the application of environmentally friendly zinc-aluminum layered double hydroxide (ZnAl-CO:LDH) is demonstrated for a high-performance, flexible UV PD. The vertically oriented ZnAl:LDH nanosheets (ZnAl:LDH Ns) are facilely synthesized by dipping the sputtered 10 wt % aluminum-doped zinc oxide thin films in deionized water at room temperature. Without passivation, the UV PDs exhibit an exceptional light-to-dark current ratio of 10 and a responsivity of ∼34.7 mA/W at a bias of 1 V. Moreover, the spectral responsivity and detectivity are enhanced to ∼148.3 mA/W and 2.5 × 10 Jones, respectively, by passivating the ZnAl:LDH Ns with polydimethylsiloxane (PDMS), thus making the device suitable for application in UV detectors. In addition, the ambient atmosphere effect on PD performance, which elucidates the clear understanding of the PD working mechanism, is also investigated. The passivation of the Ns by PDMS also helps to enhance the mechanical robustness and long-term stability of the PD. The methodology demonstrated herein highlights the potential of the ZnAl:LDH material in realizing the next generation of flexible UV PDs.
最近的研究集中在利用各种宽带隙材料开发高效、灵活且高度灵敏的紫外光探测器（UV PDs）。在本研究中，展示了环保型锌铝层状双氢氧化物（ZnAl-CO:LDH）在高性能柔性UV PD中的应用。通过将溅射的10 wt%铝掺杂氧化锌薄膜在室温下浸入去离子水中，轻松合成了垂直取向的ZnAl:LDH纳米片（ZnAl:LDH Ns）。在未进行钝化处理时，UV PDs在1 V偏压下表现出10的优异亮暗电流比和约34.7 mA/W的响应度。此外，通过用聚二甲基硅氧烷（PDMS）对ZnAl:LDH Ns进行钝化，光谱响应度和探测率分别提高到约148.3 mA/W和2.5×10琼斯，从而使该器件适用于UV探测器。此外，还研究了环境气氛对PD性能的影响，这有助于更清楚地理解PD的工作机制。PDMS对Ns的钝化也有助于提高PD的机械强度和长期稳定性。本文展示的方法突出了ZnAl:LDH材料在实现下一代柔性UV PD方面的潜力。
