Molarity-dependent effects in Nb-doped ZnO towards photoconversion enhancement via luminescent downshifting layer

Arith, Faiz and Jusoh, Yaumee Natasha and Mohd Rahim, Farah Liyana and Salehuddin, Fauziyah and Zainal Abidin, Nurul Aliyah and Muhammad Mustafa, Ahmad Nizamuddin and Chelvanathan, Puvaneswaran (2026) Molarity-dependent effects in Nb-doped ZnO towards photoconversion enhancement via luminescent downshifting layer. Physica B: Condensed Matter, 734. pp. 1-11. ISSN 0921-4526

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Abstract

The utilisation of ultraviolet (UV) light to enhance solar panel efficiency can significantly support broader adoption of solar energy. Photovoltaic performance is limited by partial absorption of the solar spectrum, restricted by intrinsic band gap constraints. To address this, a niobium (Nb)-doped zinc oxide (ZnO) layer is introduced as a luminescent downshifting (LDS) material that converts high-energy UV photons into longer wavelengths more readily absorbed by solar cells. This study reports the development of Nb-doped ZnO thin films capable of absorbing high-energy photons and re-emitting them at lower energies. Nb incorporation reduced the band gap, with 3 mol% Nb-doped ZnO exhibiting a band gap of 2.99 eV and a red-shifted absorption edge that enhances light harvesting. The films displayed densely packed nanorod structures with an electrical conductivity of 1.661 mS/cm. These findings demonstrate that tuning Nb concentration effectively improves the LDS behaviour of Nb-doped ZnO layers.

Item Type:	Article
Uncontrolled Keywords:	Niobium, Zinc oxide, Band gap, Red shifting, Molarity-dependent
Divisions:	Faculty Of Electronics And Computer Technology And Engineering
Depositing User:	Sabariah Ismail
Date Deposited:	13 Jul 2026 07:18
Last Modified:	13 Jul 2026 07:18
URI:	http://eprints.utem.edu.my/id/eprint/29981
Statistic Details:	View Download Statistic

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