Annealing Treatment on Homogenous n-TiO2/ZnO Bilayer Thin Film Deposition as Window Layer for p-Cu2O-Based Heterostructure Thin Film

Mohamad Arifin, Nurliyana and Mohamad, Fariza and Hussin, Rosniza and Mohd Ismail, Anis Zafirah and Ahmad Ramli, Shazleen and Ahmad, Norazlina and Muhd Nor, Nik Hisyamudin and Sahdan, Mohd Zainizan and Mohammad Zain, Mohd Zamzuri and Izaki, Masanobu (2023) Annealing Treatment on Homogenous n-TiO2/ZnO Bilayer Thin Film Deposition as Window Layer for p-Cu2O-Based Heterostructure Thin Film. Coatings, 13 (206). pp. 1-13.

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Metal oxide semiconductor material has great potential to act as window layer in p–n heterojunction solar cell thin film owing to low production cost and significant properties in photovoltaic mechanism. In this work, n-TiO2/ZnO bilayer thin film was effectively constructed by means of sol-gel spin coating technique in an effort to diminish the electron-hole recombination rate from single-layered thin film. Annealing time is one of the important parameters in the fabrication process and was varied to study the impact of annealing treatment towards the thin film characteristics as window layer. It was found that the optimum parameter for the n-TiO2/ZnO bilayer was 500 ◦C with an annealing time of 2 h. High crystallinity of the n-(101)-TiO2/(002)-ZnO bilayer thin film was obtained, which consists of anatase and a hexagonal wurtzite structure, respectively. Orientation of (002)-ZnO is essential for deposition with the (111) Cu2O-absorbing layer due to a low different lattice mismatch between these two interfaces. The homogenous morphology of n-TiO2/ZnO bilayer was observed with a compact and dense layer. The improvement of transmittance has also been achieved in a range of 60%–80%, which indicated that the incident light can penetrate throughout the thin film directly. In addition, a p-Cu2O absorbing layer was successfully fabricated on top of n-TiO2/ZnO bilayer thin film to form a p-n junction in order to visualize significant electrical rectification properties. The existence of p-Cu2O was confirmed by a (111)-peak orientation and triangular shape in structural and morphological properties, respectively

Item Type: Article
Uncontrolled Keywords: n-TiO2/ZnO bilayer; sol-gel spin coating; annealing treatment; homogenous thin film; p-Cu2O-based heterostructure thin film
Subjects: T Technology > T Technology (General)
Divisions: Faculty of Engineering Technology > Department of Mechnical Engineering Technology
Depositing User: Mr. Mohamad Zulkhibri Rahmad
Date Deposited: 25 Jun 2023 07:08
Last Modified: 25 Jun 2023 07:08

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