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Cupric oxide film with a record hole mobility of 48.44?cm2/Vs via direct–current reactive magnetron sputtering for perovskite solar cell application
摘要： Cupric iodide and cuprous oxide as hole–transporting layer (HTL) materials in perovskite solar cells (PSCs) have been reported. However, the compositional instability and poor electrical conductivity of ?lms in ambient air have limited their applications in PSCs. Cupric oxide (CuO) ?lms may be used as a HTL material in PSCs due to their high electrical conductivity and high stability in ambient air even if their hole mobility is still required to further increase. Herein, single-phase monoclinic CuO ?lms with p–type conduction were room-temperature prepared via direct–current reactive magnetron sputtering, thereby garnering low–cost advantage. CuO ?lm prepared at 1:3 O2/Ar ?ow ratio (Ro/a) was best crystallized and preferred ??1 1 1? oriented, thereby resulting in a record mobility of 48.44 cm2/Vs and small electrical resistivity of 0.50 Ω?cm. The PSCs with CuO as HTL material obtained 1.3% power conversion e?ciency, indicating that CuO ?lms with record hole mobility could be used as a HTL material in PSCs.
关键词： Hole–transporting layer,Cupric oxide,Perovskite solar cells,Magnetron sputtering,Optical properties,Electrical properties
更新于2025-09-12 10:27:22
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Hydrogen gas sensing properties of WO3 sputter-deposited thin films enhanced by on-top deposited?CuO nanoclusters
摘要： Magnetron-based gas aggregation cluster source (GAS) was used to prepare high-purity CuO (cupric oxide) nanoclusters on top of sputter-deposited thin film of tungsten trioxide (WO3). The material was assembled as a conductometric hydrogen gas sensor and its response was tested and evaluated. It is demonstrated that addition of CuO clusters noticeably enhances the sensitivity of the pure WO3 thin film. With an increasing amount of CuO clusters the sensitivity of CuO/WO3 system rises further. When CuO clusters form a sufficiently thick and compact layer, the resistance response is reversed. Based on the sensorial behavior, conventional and near-ambient pressure X-Ray photoemission spectroscopies, and resistivity measurements, we propose that the sensing mechanism is based on the formation of nano-sized p-n junctions in between p-type CuO and n-type WO3. The advantages of the GAS technique for preparing sensorial and/or catalytically active materials are emphasized.
关键词： Hydrogen gas sensor,Gas aggregation cluster source,Magnetron sputtering,Tungsten oxide,Nanocomposites,Cupric oxide
更新于2025-09-10 09:29:36
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Spin coated multilayered CuO/ZnO films with high output power under irradiation
摘要： Thin films of pure CuO, pure ZnO and CuO/ZnO multilayers were synthesized using the spin coating technique. CuO and ZnO layers were spin coated for 30 s at speeds of 2000 and 1500 rpm, respectively. All the samples were subsequently annealed at 500 0C for one hour in air. Structural properties of films investigated using XRD patterns indicated the crystallization of single phase of CuO and ZnO. Optical band gaps of samples determined by UV-Visible spectrums were in the range of the band gaps of CuO and ZnO. The main objective of the preparation of multilayered CuO/ZnO was enhancing the output power by combining wide band gap and narrow band gap materials. CuO with higher photocurrent and ZnO with higher photovoltage were employed to achieve this task. Photocurrent, photovoltage and impedance were measured in order to investigate the electrical properties of these samples. A liquid junction photocell with electrolyte potassium iodide (KI) was employed to measure photovoltaic properties. A multilayer with ZnO as the top layer provides a higher output power of 3.6 μW/cm2 compared to the output power of a multilayer with CuO as the top layer (1.1 μW/cm2). This is the highest output power reported for a multilayer of CuO/ZnO without any dye coating in KI electrolyte. The highest output power of our multilayered samples is more than twice the previously reported highest output powers of pure CuO and pure ZnO thin film samples without dye coating. Chemical properties of samples were confirmed by FTIR. Crystallite sizes were in the range from 23 to 28 nm. Impedance curves of the samples were measured under dark and light conditions. Two semicircles could be observed at Nyquist plots of both multilayer samples.
关键词： photovoltaic properties,spin coating,XRD,Cupric Oxide,multilayers,Zinc Oxide
更新于2025-09-04 15:30:14