VNU Journal of Science Mathematics – Physics, Vol 37, No 4 (2021) 11 16 11 Original Article Influences of ZnO Nanorod Arrays on Photocatalytic Activity of n ZnO Nanorods/p Si Heterostructure Nguyen Dinh Lam VNU University of Engineering and Technology, 144 Xuan Thuy, Cau Giay, Hanoi, Vietnam Received 06 October 2020 Revised 24 November 2020; Accepted 27 January 2021 Abstract Zinc oxide is known as an excellent material for biosensors, solar cells, semiconductors and photocatalysts In this work,[.]