低维铁电、铁磁、半导体薄膜及其异质结构的外延生长和制备，研究低维铁电材料界面丰富的磁、光、电耦合效应，探索它们在现代信息存储、驱动传感等领域的应用。

1).系统研究了有机铁电聚合物P(VDF-TrFE)薄膜的铁电畴翻转动力学行为，发现其遵循传统的形核-铁电畴长大机制; 2). 利用空间电荷-铁电极化静电相互作用实现了有机铁电电容器的三态存储。3). 利用稀土掺杂BiFeO3大幅降低漏电流，在铁电隧道结中实现了105的高开关比；在隧道结中首次观察到铁电光伏效应，实现了铁电极化的光读取；4). 提出利用界面势垒获取持续光电导的新机制，并在铁电/半导体异质结中实现了~106的巨大持续光电导；5). 实验证实-In2Se3是关联型二维范德华铁电材料，并观察到铁电极化相关的可变向二极管效应。近年来，以通讯作者或第一作者在Nature Communications、Advanced Functional Materials,、Nano letter等学术期刊发表论文多篇，在npj 2D materials and application发表二维铁电综述。共发表论文40余篇，他引2000余次，H因子20。代表性论文如下：
1). W. J. Hu(#)(*), Z. H. Wang, W. L. Yu, & T. Wu(*). “Optically controlled electroresistance and electrically controlled photovoltage in ferroelectric tunnel junctions”. Nature Communications, 7, 10808 (2016).
2). W. J. Hu(#), T. R. Paudel, S. Lopatin, Z. H. Wang, H. Ma, K. W. Wu, A. Bera, G. L. Yuan, A. Gruverman, E. Y. Tsymbal(*), & T. Wu(*). “Colossal X-ray induced persistent photoconductivity in current-perpendicular-to-plane ferroelectric/semiconductor junctions”. Advanced Functional Materials, 28, 1704337 (2018).
3). C. J. Cui(#), W. J. Hu(#)(*), X. X. Yan, C. Addiego, W. P. Gao, Y. Wang, Z. Wang, L. Z. Li, Y. C. Cheng, P. Li, X. X. Zhang, H. N. Alshareef, T. Wu, W. G. Zhu, X. Q. Pan(*), L. J. Li(*), “Intercorrelated in-plane and out-of-plane ferroelectricity in ultrathin two-dimensional layered semiconductor In2Se3”, Nano Letter, 18, 1253−1258 (2018).
4). Fei Xue(#)(*), Weijin Hu(#), Ko-Chun Lee(#), Li-Syuan Lu, Junwei Zhang, Hao-ling Tang, Ali Han, Wei-Ting Hsu, Shaobo Tu, Wen-Hao Chang, Chen-Hsin Lien, Jr-Hau He, Zhidong Zhang, Lain-Jong Li(*), & Xixiang Zhang(*), Room-temperature ferroelectricity in hexagonally layered -In2Se3 nanoflakes down to the monolayer limit, Advanced Functional Materials, 28, 1803738 (2018).
5). Chaojie Cui(#), Fei Xue(#), Wei-Jin Hu(*), Lain-Jong Li(*), Two-dimensional materials with piezoelectric and ferroelectric functionalities, npj 2D materials and application, 2, 1 (2018).
6). Xiaohan Li(#), Biaohong Huang, Weijin Hu(*), Zhidong Zhang, Electrical and optical modulation on ferroelectric properties of P(VDF-TrFE) thin film capacitors, Journal of Material Science & Technology, 35, 2194 (2019).
7). Jafar. H. Shah(#), Biaohong Huang, Ahmed M. Idris, Yong Liu, Anum S. Mallik, Weijin Hu(*), Zhidong Zhang, Hongxian Han(*), & Can Li, Regulation of ferroelectric polarization to achieve efficient charge separation and transfer in particulate RuO2/BiFeO3 for high photocatalytic water oxidation activity. Small, 16, 2003361 (2020).
8). Dingshuai Feng(#), Biaohong Huang, Lingli Li, Xiaoqi Li, Youdi Gu, Weijin Hu(*), Zhidong Zhang. The effects of Eu3+ doping on the epitaxial growth and photovoltaic properties of BiFeO3 thin films, Journal of Material Science & Technology, 106, 49-55  (2022).