Abstract
Bandgap engineering of transition metal dichalcogenides (TMDs) is significant for broadening their applications in electronics and optoelectronics devices. Herein, we report the new epitaxial growth of large-area uniform ZrS{in2(1−{itx})}Se{in2x} alloy films with fully tunable composition on sapphire substrates {itvia} a facile single-step chemical vapor deposition method. The ZrS{in2(1−{itx})}Se{in2{itx}} alloys exhibit good single crystallinity and epitaxial quality, as well as uniform elemental distribution, and the epitaxial relationship with the substrate is determined to be ZrS{in2(1−{itx})}Se{in2{itx}} (0001)[10–10]∥sapphire (0001)[11–20]. The bandgap of ZrS{in2(1−{itx})}Se{in2{itx}} alloy exhibits a pronounced bowing behavior with continuously tunable bandgaps from 1.86 to 1.15 eV, depending on the Se composition. The ZrS{in2(1−{itx})}Se{in2{itx}}-based photodetectors demonstrate a sensitive photoresponse to visible light with a fast response time of ∼100 µs, and their performances are significantly improved as the Se composition decreases. This work provides an efficient way to synthesize ZrS{in2(1−{itx})}Se{in2{itx}} alloys with fully tunable bandgaps, providing great flexibility in designing TMD-based optoelectronic devices.
摘要
过渡金属硫化物(TMDs)的带隙工程对于拓宽其在电子和光电子 器件中的应用具有重要意义. 本文中, 我们首次报道了通过简单的一步 化学气相沉积法在蓝宝石衬底上外延生长大面积、全组分可调的 ZrS2(1−x)Se2x合金薄膜. ZrS2(1−x)Se2x合金表现出优异的单晶性和外延质 量, 以及均匀的元素分布, 其与衬底的外延关系被确定为ZrS2(1−x)Se2x (0001)[10-10]//蓝宝石(0001)[11-20]. ZrS2(1−x)Se2x合金的带隙随组分的 变化从1.86到1.15 eV连续可调, 且表现出明显的弯曲特性. 基于 ZrS2(1−x)Se2x的光电探测器对可见光具有灵敏的光响应, 响应时间约为 100 μs, 随着Se组分的减少, 探测器性能显著提高. 本工作为合成带隙 可调的ZrS2(1−x)Se2x合金提供了一种有效方法, 为设计基于TMDs的光电 器件提供了极大的灵活性.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (61874106 and 62274151) and the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB43000000).
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Huang J, Li X, and Zhang X conceived and designed the project and wrote the manuscript. Huang J and Tian Y prepared the samples and performed the experiments; Chen J and Zhang S participated in the investigation; Cheng Y and Yin Z performed the DFT calculations; Li J, Jiang J, and Wang G participated in the analysis of the data; Zhang X supervised the project; all authors contributed to the general discussion. All authors read and approved the manuscript.
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Supporting data are available in the online version of the paper.
Jidong Huang received his BEng degree from the College of Physics, Qingdao University. He is a Master’s degree candidate under the supervision of Prof. Xingwang Zhang. His research interest focuses on 2D materials and their applications.
Xingxing Li received his Master’s degree from Hubei University in 2016 and PhD degree from the University of Chinese Academy of Sciences in 2019. He joined the Faculty of Intelligent Manufacturing, Wuyi University in 2019. His research focuses on oxide thin films, 2D materials, and semiconductor devices.
Xingwang Zhang is a full professor at the Institute of Semiconductors, Chinese Academy of Sciences. He received his BSc and PhD degrees from Lanzhou University in 1994 and 1999, respectively. Afterward, he worked as a postdoctoral fellow at The Chinese University of Hong Kong from 1999 to 2001. Then, he worked as a Humboldt research fellow at the University of Ulm, Germany, from 2001 to 2004. His current research interests include ultrawide bandgap semiconductors, 2D materials, and photovoltaic materials and devices.
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Large-area epitaxial growth of 2D ZrS2(1−x)Se2x semiconductor alloys with fully tunable compositions and bandgaps for optoelectronics
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Huang, J., Tian, Y., Cheng, Y. et al. Large-area epitaxial growth of 2D ZrS2(1−x)Se2x semiconductor alloys with fully tunable compositions and bandgaps for optoelectronics. Sci. China Mater. 66, 1870–1878 (2023). https://doi.org/10.1007/s40843-022-2297-1
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DOI: https://doi.org/10.1007/s40843-022-2297-1