Abstract
Oxygen-containing rare-earth metal hydride, YHxOy, is a newly found photochromic material showing fast photoresponse. While its preparation method, optical properties and structural features have been studied extensively, the photochromic mechanism in YHxOy remains unknown. Here, using excited-state molecular dynamics simulation based on the recently developed real-time time-dependent density functional theory (RT-TDDFT) method, we study the photochemical reactions in YHxOy. We find that under photoexcitation, dihydrogen defects are formed within 100 fs. The dihydrogen defect behaves as a shallow donor and renders the material strongly n-type doped, which could be responsible for the photochromic effect observed in YHxOy. We also find that oxygen concentration affects the metastability of the dihydrogen species, meaning that the energy barrier for the dihydrogen to dissociate is related to the oxygen concentration. The highest barrier of 0.28 eV is found in our model with O/Y=1:8. If the oxygen concentration is too low, the dihydrogen will quickly dissociate when the excitation is turned off. If the oxygen concentration is too high, the dihydrogen dissociates even when the excitation is still on.
摘要
含氧稀土金属氢化物YHxOy是一种新发现的、具有快速光响应的光致变色材料. 尽管其制备方法、光学性质和结构特征已被广泛研究, 但YHxOy中的光致变色机理仍然未知. 本文采用基于最新开发的含时密度泛函理论的激发态分子动力学模拟研究了 YHxOy中的光化学反应. 结果发现, 光激发下在100 fs内可以形成一种双氢缺陷. 该双氢缺陷为浅施主, 使材料表现出强n型掺杂行为, 这可能是导致YHxOy中光致变色效应的原因. 此外还发现, 氧浓度会影响双氢缺陷的稳定性, 这意味着双氢解离的能垒与氧浓度有关. 在此模型中, 当O/Y=1:8时, 双氢解离的能垒约为0.28 eV. 若氧浓度过低, 在关闭激发时双氢会迅速解离; 若氧浓度过高, 即使在光激发下双氢也会快速解离.
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Acknowledgements
Chai J and Sun Y-Y acknowledge the support by the National Natural Science Foundation of China (11774365).
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Sun YY and Cao X initiated and coordinated the research. Chai J, Wang H, Ming C, Zhang S and Sun YY conducted the computational studies and data analysis. Shao Z, Jin P and Cao X prepared the samples. Shao Z, Jin P, Cao X, Oh W, Ye T and Zhang Y conducted experimental measurements on the samples. All authors participated in the discussion of the results. Chai J, Shao Z, Wang H, Cao X and Sun YY wrote the paper.
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The authors declare that they have no conflict of interest.
Jun Chai received his BSc degree from the School of Materials Science and Engineering, Shanghai University in 2017. Now he is a PhD candidate in Prof. Yi-Yang Sun’s group at the State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences. His current research focuses on the physical and chemical mechanisms of defects in energy materials using the first-principles calculations.
Zewei Shao received his BSc degree in material science and engineering from the University of Science and Technology of China in 2016. Now he is a PhD candidate in Prof. Xun Cao’s group at the State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences. His current research focuses on the design of functional oxide films and their applications for smart windows.
Han Wang received his PhD degree from Rensselaer Polytechnic Institute (RPI) in 2017. Currently he is working as a postdoctoral fellow at Lawrence Berkeley National Laboratory (LBNL), USA. His current research interest is the study of non-adiabatic dynamics of molecular and solid systems and the simulation of ground and excited state X-ray absorption spectra.
Xun Cao is a Professor at the State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences (SICCAS). He obtained his PhD degree from SICCAS in 2010. He joined the University of California in 2015 as a visiting research fellow. At present, the he works as a Professor and Deputy Head of the Research Group of Smart Materials in SICCAS. His research interests include functional films and chromogenic materials.
Yi-Yang Sun received his PhD degree from National University of Singapore (NUS) in 2004. He has worked as postdoc at NUS, National Renewable Energy Laboratory, and Rensselaer Polytechnic Institute (RPI). In 2010, he was appointed research assistant professor and later research scientist at RPI. In 2017, he assumed a professor position at Shanghai Institute of Ceramics, Chinese Academy of Sciences. His research focuses on the study of energy-related materials using the first-principles computations.
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Chai, J., Shao, Z., Wang, H. et al. Ultrafast processes in photochromic material YHxOy studied by excited-state density functional theory simulation. Sci. China Mater. 63, 1579–1587 (2020). https://doi.org/10.1007/s40843-020-1343-x
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DOI: https://doi.org/10.1007/s40843-020-1343-x