Work-Function-Tunable MXenes Electrodes to Optimize p-CsCu2I3/n-Ca2Nb3-xTaxO10 Junction Photodetectors for Image Sensing and Logic Electronics
Work-Function-Tunable MXenes Electrodes to Optimize p-CsCu2I3/n-Ca2Nb3-xTaxO10 Junction Photodetectors for Image Sensing and Logic Electronics
复制标题
工作功能可调谐 MXenes 电极，可优化用于图像传感和逻辑电子器件的 CsCu2I 3/nCa2Nb3-xTaxO10 结光电探测器
DOI：
10.1002/adfm.202201066
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发表时间：
2022-03-09
影响因子：
19
通讯作者：
Fang, Xiaosheng
中科院分区：
文献类型：
--
作者：
Chen, Jiaxin;Liu, Xinya;Fang, Xiaosheng
基于MXene的光电子器件具有很高的可调谐功函数，表面修饰为改变其费米能级和调制功函数提供了巨大的潜力。在这项工作中，通过用LiF、Se和聚乙氧基亚胺(PEIE)进行表面修饰，将MXene的功函数窗口从4.55 eV设计到5.25 eV。在此基础上构建了p-CsCu2I3/n-Ca2Nb3-xTaxO10结光电探测器，改变了n-Ca2Nb3-xTaxO10与电极之间的肖特基势垒。特别是，使用PEIE修饰的MXene电极显著增强了整流效果，获得了16136的高整流比和81.3A W-1的紫外响应度。这种基于MXenes电极的高性能器件与标准的洁净室制造工艺兼容，实现了大规模柔性紫外光探测器，在5000次弯曲后仍保持80%的原始电流。同时，构建了不同波长紫外光激发下的光电探测器阵列，以揭示其在图像传感方面的潜力。最后，利用Au/CsCu2I3/Ca2Nb3-xTaxO10/MXene-PEIE光电探测器研制了用于紫外光通信的“与”和“或”光电逻辑门，丰富了MXene光电子器件的应用。这项通过表面修饰来调谐MXene功函数的工作表明，MXene是未来光电子学的一个很有前途的候选材料。
Tunable work function has a high profile for the MXene-based optoelectronic devices, and surface modification provides the huge potential to shift its Fermi level and modulate the work function. In this work, the window of MXene's work function is engineered from 4.55 to 5.25 eV by surface modification with LiF, Se, and polyethylenimine ethoxylated (PEIE). The vertical p-CsCu2I3/n-Ca2Nb3-xTaxO10 junction photodetectors are constructed on the basis of the above surface-modified MXenes, which changes the Schottky barrier between n-Ca2Nb3-xTaxO10 and the electrodes. In particular, the rectification effect is significantly enhanced by utilizing PEIE-decorated MXene electrodes, resulting in a high rectification ratio of 16 136 and improved UV responsivity of 81.3 A W-1. Such high-performance devices based on MXenes electrodes are compatible with the standard clean room fabrication process, realizing large-scale flexible UV detectors that maintain 80% of the original current after 5000 times bending. Meanwhile, a photodetector array stimulated with UV of different wavelengths is constructed to reveal its potential for image sensing. Finally, functional "AND" and "OR" optoelectronic logic gates are developed for UV communication using Au/CsCu2I3/Ca2Nb3-xTaxO10/MXene-PEIE photodetectors, enriching the application of MXene-based optoelectronic devices. This work on tuning MXene work function via surface modification demonstrates that MXene is a promising candidate for future optoelectronics.