Charge transfer and X-ray absorption investigations in aluminium and copper co-doped zinc oxide nanostructure for perovskite solar cell electrodes

Mandeep Kaur; Sanjeev Gautam; Keun Hwa Chae; Wantana Klysubun; Navdeep Goyal

doi:10.1038/s41598-023-37754-1

Charge transfer and X-ray absorption investigations in aluminium and copper co-doped zinc oxide nanostructure for perovskite solar cell electrodes

Sci Rep. 2023 Jul 4;13(1):10769. doi: 10.1038/s41598-023-37754-1.

Authors

Mandeep Kaur^{1

2}, Sanjeev Gautam³, Keun Hwa Chae⁴, Wantana Klysubun⁵, Navdeep Goyal²

Affiliations

¹ Advanced Functional Materials Laboratory, Dr. S. S. Bhatnagar University Institute of Chemical Engineering & Technology, Panjab University, Chandigarh, 160014, India.
² Department of Physics, Panjab University, Chandigarh, 160014, India.
³ Advanced Functional Materials Laboratory, Dr. S. S. Bhatnagar University Institute of Chemical Engineering & Technology, Panjab University, Chandigarh, 160014, India. sgautam@pu.ac.in.
⁴ Advanced Analysis & Data Center, Korea Institute of Science and Technology, Seoul, 02792, South Korea.
⁵ Synchrotron Light Research Institute, Nakhon Ratchasima, 30000, Thailand.

Abstract

This study explores influence of charge transfer and X-ray absorption characteristics in aluminum (Al) and copper (Cu) co-doped zinc oxide (ZnO) nanostructures for perovskite solar cell electrodes. Sol-gel technique was employed to synthesize the nanostructures, and their optical and morphological properties were investigated. X-ray diffraction (XRD) analysis confirmed high crystallinity and also single-phase composition of all the samples, particularly up to 5% Al co-doping. Field emission scanning electron microscopy (FESEM) exhibited the formation of pseudo-hexagonal wurtzite nanostructure and the transition to nanorods at 5% Al co-doping. Diffuse reflectance spectroscopy indicated a reduction in the optical band gap of co-doped zinc oxide from 3.11 to 2.9 eV with increasing Al doping. Photoluminescence spectra (PL) exhibited a decrease in peak intensity, suggesting enhanced conductivity in ZnO, also confirmed from I-V measurements. Near-edge X-ray absorption fine structure (NEXAFS) analysis depicts that charge transfer from Al to oxygen (O) species enhanced the photosensing properties of the nanostructure, which was supported by FESEM micrographs and PL spectra. Furthermore, the study discovered that 5% Al co-doping significantly reduced the density of emission defects (deep-level) in Cu-ZnO nanostructure. These findings highlight the potential of Cu and Al co-doped ZnO materials for perovskite solar cell electrodes, as their improved optical and morphological properties resulting from charge transfer could enhance device performance. The investigation of charge transfer and X-ray absorption characteristics provides valuable insights into the underlying mechanisms and behaviors of the co-doped ZnO nanostructures. However, further research is required to delve into the intricate hybridization resulting from charge transfer and explore the broader impact of co-doping on other properties of the nanostructures, enabling a comprehensive understanding of their potential applications in perovskite solar cells.

Grants and funding

1263/(CSIR-UGC NET DEC. 2017)/CSIR-UGC