Enhanced opto-electronic properties of X-doped (X = Al, Ga, and In) CuO thin films for photodetector applications

Gnanasekar, T.; Valanarasu, S.; Das, Himadri Tanaya; Chidhambaram, N.; Isaac, R. S. Rimal; Al‐Enizi, Abdullah M.; Ubaidullah, Mohd; Reddy, Vasudeva Reddy Minnam

doi:10.1007/s10854-022-08728-2

Cited by 7 publications

(2 citation statements)

References 52 publications

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“…This change in D values may be due to the shift and broadening of the peaks due to defects in crystal symmetry caused by the addition of Al 3+ to the solution. This difference can also be attributed to differences in the radii of Cu 2+ (0.57 Å) and Al 3+ (0.39 Å) (for a 4-coordination number) …”

Section: Resultsmentioning

confidence: 99%

Conductometric Flexible CuO-Based Sweat-Loss Monitoring Sensor for Future Wearable Technology in Healthcare

Aydin,

Kahveci,

Akkaya

et al. 2023

ACS Omega

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Healthcare tracking supports early diagnosis of illnesses, realtime tracking of the impacts of therapy and treatment, and tracking of cases of human health. Based on this, real-time tracking of sweat loss provides an easy, convenient, and noninvasive approach to the early diagnosis of physical illness in individuals. To date, copper oxide (CuO) as a nanostructured semiconductor metal-oxide is regarded as a hopefully p-type sensing material. The corresponding sweat rate monitoring systems were fabricated using a repeatable and cost-effective SILAR system using a cellulose acetatebased organic substrate. To provide a practical application, we investigated the working efficiency of Al:CuO under room conditions since most clinical and healthcare industries operate under ambient temperature. Fabricated flexible devices immediately respond to the implementation of the sweat solution and reach a steady-state value in a short time. It can be obtained from experimental results that the sweat-loss monitoring performances of CuO-based devices can be enhanced by employing Aldoping. The increment in the sensing efficacy was interpreted in terms of structural and morphological characterization and electrical data. Our designed flexible thin film-based system can be used in conjunction with a customized wearable, healthcare industry integrated, low-cost fabrication source.

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Section: Resultsmentioning

confidence: 99%

Conductometric Flexible CuO-Based Sweat-Loss Monitoring Sensor for Future Wearable Technology in Healthcare

Aydin,

Kahveci,

Akkaya

et al. 2023

ACS Omega

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“…Among the above-mentioned strategies, doping has been found to be an effective route to enhance the physico-chemical and opto-electrical properties by tuning the electronic band structure. Although several atoms have been used to tune the properties of CuO, Al has been observed to be a highly suitable dopant due to its low cost, easy availability, and non-toxicity, as well as its remarkable influence on the structural, morphological, thermal, and optical properties of CuO nanostructures due to the energetically favorable ionic radius of Al +3 (0.53 Å) against Cu +2 (0.73 Å) for substitutional doping [36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Battery-Type Behavior of Al-Doped CuO Nanoflakes to Fabricate a High-Performance Hybrid Supercapacitor Device for Superior Energy Storage Applications

Pallavolu,

Banerjee,

Joo

2023

Coatings

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The ever-increasing energy demands have prompted researchers to develop innovative charge-storage devices. Here, aluminum-doped copper-oxide nanoflakes were fabricated via a simple co-precipitation method to investigate the electrochemical properties, which depicted a novel dominant battery-type charge-storage mechanism, manifested by the porous morphology of the electrodes to enhance the diffusion-controlled process. Copper oxide was chosen as the electroactive material due to its low cost, easy processability, environmental friendliness, and multiple oxidation states, all of which are very important for practical applicability in charge-storage devices. Additionally, aluminum was chosen as a dopant due to its elemental abundance, non-toxicity, and energetically favorable ionic radius for substitutional doping. A maximum 272 C/g (@1 A/g current-density) specific capacity was observed for 5 wt% Al-doped CuO. Evidently, higher Al-doping provided increased defects and doping sites to enhance the redox activity in order to improve the supercapacitive performance. A combinatorial battery−capacitor charge-storage mechanism was proposed in terms of the accumulation and intercalation of charges at the inner electroactive sites of the nanoflakes through a large number of voids and cavities in order to contribute towards dominant battery-type diffusion capacitance, while optimum Al-doping created considerable redox-active sites to promote surface-controlled pseudocapacitance. The optimized Al-CuO electrode revealed extraordinary long-term cycling stability with 99% capacity retention over 5000 charge/discharge cycles. A hybrid two-electrode device, made up of a battery type Al-CuO positrode and capacitor-type activated-carbon negatrode, demonstrated a remarkable energy-power performance with a maximum energy density of 30 Wh/kg and a maximum power density of 7.25 kW/kg, with an excellent cycle life (98% capacity retention over 5000 cycles). This work demonstrates a novel strategy to fabricate high-performance hybrid supercapacitors for the next generation charge-storage devices.

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Investigation of Multi‐Phase Structure and Optoelectronic Performance of Bi‐Doped (Cu−Zn) Oxide Composite Thin Films

et al. 2023

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In this research, thin film composite structures were used to prepare optoelectronic devices from bare and Bi‐substituted p‐CuO/n‐ZnO systems. The p‐CuO/n‐ZnO composite thin film structures were prepared by the SILAR technique, and the influences of two different Bi contents on the structure and main physical performances of the samples were investigated. The X‐ray diffraction (XRD) technique showed that the composited thin film materials were multiphased in rutile hexagonal (wurtzite) phase (ZnO) and monoclinic tenorite phase (CuO) type crystal structure. The obtained surface morphological results presented that the structure exhibits an almost homogeneous, plate‐like surface distribution, and depending on the increase of Bi concentration, the plate‐like sheet area widens from ~2.5 μm to 10 μm and the layer boundaries decrease. FT‐IR and Raman spectroscopy were used to investigate the various vibration and Raman active phonon modes of Bi:p‐CuO/n‐ZnO nanostructured heterostructures. For a comprehensive analysis of the optical bandgap of the fabricated composite samples, the estimated values were obtained from the Tauc plot. Produced samples exhibited an Ohmic behavior and dc resistivity values of films can be determined via Ohm′s Law. The adjusted sheet resistance value of 11.51 MΩ/sq when the content of Bi 3.0 % in the growth bath.

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Enhanced opto-electronic properties of X-doped (X = Al, Ga, and In) CuO thin films for photodetector applications

Cited by 7 publications

References 52 publications

Conductometric Flexible CuO-Based Sweat-Loss Monitoring Sensor for Future Wearable Technology in Healthcare

Conductometric Flexible CuO-Based Sweat-Loss Monitoring Sensor for Future Wearable Technology in Healthcare

Battery-Type Behavior of Al-Doped CuO Nanoflakes to Fabricate a High-Performance Hybrid Supercapacitor Device for Superior Energy Storage Applications

Investigation of Multi‐Phase Structure and Optoelectronic Performance of Bi‐Doped (Cu−Zn) Oxide Composite Thin Films

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