Article Dans Une Revue Thin Solid Films Année : 2025

Copper oxide by spin-coating: Cost-effective deposition and post-annealing process for thin films with modulated Cu2O/CuO phase ratio

Résumé

Copper oxide, in its cuprous (Cu2O) and cupric (CuO) phases, is a promising material for energy and sensor applications due to its abundance, low cost, non-toxicity, and advantageous optoelectronic properties. However, its application in optoelectronic devices is limited by the lack of environmentally sustainable, cost-effective deposition methods capable of precise phase control. This work presents a spin-coating deposition method that utilizes non-toxic precursors in a cost-effective and scalable process. The method comprises two critical stages: (1) optimization of the spin-coating process by varying rotation speed (2000–6000 rpm) and cycle number (1–14 cycles) to produce homogeneous thin films with controlled thickness (20–175 nm) and low surface roughness (5 nm); and (2) post-annealing to achieve phase-specific control. Annealing at 300 °C induces predominantly Cu2O, while biphased films are obtained at lower or higher temperatures. Optical and electrical characterization reveals a direct bandgap of 1.88 eV for Cu2O-dominant films and all films exhibit p-type conductivity, carrier mobility of 17–30 cm^2 V^-1 s^-1 , and carrier concentrations of 8 × 10^13 - 10^15 cm^−3 . This cost-effective and scalable method demonstrates precise phase control and material properties, highlighting copper oxide’s potential for next-generation optoelectronic devices.

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Dates et versions

hal-05223498 , version 1 (26-08-2025)

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Wafae El Berjali, Victor Colas, Sidi Ould Saad Hamady, Sha Shiong Ng, Nur Atiqah Hamzah, et al.. Copper oxide by spin-coating: Cost-effective deposition and post-annealing process for thin films with modulated Cu2O/CuO phase ratio. Thin Solid Films, 2025, 826, pp.140762. ⟨10.1016/j.tsf.2025.140762⟩. ⟨hal-05223498⟩
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