Applied Science and Convergence Technology 2020; 29(4): 91-93
Published online July 31, 2020
Copyright © The Korean Vacuum Society.
Jaewon Oh and Mee-Yi Ryu*
Department of Physics, Kangwon National University, Gangwon-do 24341, Republic of Korea
Correspondence to:E-mail: email@example.com
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-CommercialLicense (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution,and reproduction in any medium, provided the original work is properly cited.
To achieve highly efficient perovskite solar cells, it is important to design a metal oxide layer with high electron mobility. In this study, well-aligned ZnO nanorods (NRs) were prepared through the hydrothermal method using ZnO seed layers with varying thickness. The effect of the structural and optical properties of the perovskite layer deposited under the prepared conditions was systematically investigated via scanning electron microscopy, X-ray diffraction, ultraviolet–visible spectroscopy, and photoluminescence (PL) spectroscopy. The improved alignment of the ZnO NRs was found to affect the topography of the perovskite polycrystals, such as increased grain size and improved uniformity of the perovskite layer. The thicker the ZnO seed layer, the more enhanced the alignment of the ZnO NRs, resulting in larger and more uniform grains. The perovskite layer deposited on the well-aligned ZnO NRs exhibited increased absorbance and PL intensity without changing crystallinity. Our results will help improve the efficiency of high-quality perovskite devices based on ZnO electron transport layer.
Keywords: Perovskite, ZnO nanorod, Electron transport layer, Photoluminescence, Scanning electron microscope