One step hydrothermal synthesis of a rGO–TiO<sub>2</sub> nanocomposite and its application on a Schottky diode: improvement in device performance and transport properties

Das, Mukunda P.; Datta, Joydeep; Dey, Arka; Jana, Rajkumar; Layek, Animesh; Middya, Somnath; Ray, Partha Pratim

doi:10.1039/c5ra17795b

Cited by 69 publications

(49 citation statements)

References 37 publications

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“…This photocurrent value of 10% Li:TiO 2 /p‐Si diode at −5 V under 30 mW cm −2 is higher than the Al/TiO 2 /p‐Si structure with a value of ≈10 −5 A under 100 mW cm −2 , [ 63 ] the TiO 2 :ZnO/p‐Si structure with a value of ≈5 × 10 −5 A under 100 mW cm −2 [ 70 ] and lower than 5% coumarin:TiO 2 /p‐Si with a value of 1.33 × 10 −4 A, [ 61 ] and NiO:TiO 2 /n‐Si with a value of 5.25 × 10 −4 A. [ 60 ] Das et al [ 71 ] fabricated indium tin oxide (ITO)/TiO 2 /Al and ITO/reduced graphene oxide (rGO)–TiO 2 /Al Schottky diodes by the spin‐coating method. As a result of transient photocurrent measurements, they reported that the photosensitivity of the ITO/rGO–TiO 2 /Al increased by about 42% compared with the ITO/TiO 2 /Al diode.…”

Section: Resultsmentioning

confidence: 99%

The Optoelectrical Properties of Li: TiO₂/p‐Si Photodiodes for Various Li Doping

Rüzgar

2020

Physica Status Solidi (a)

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TiO 2 has received intense attention for optoelectronic applications due to its excellent properties, such as non-toxicity, low cost, and simple preparation. Herein, the influence of Li doping both on the structural and optical characteristics of TiO 2 thin films and on optoelectronic properties of TiO 2-based photodiodes is investigated. The root-mean-square (RMS) roughness values obtained from the atomic force microscopy (AFM) results and the optical bandgap energies calculated from the Tauc method vary between 3.40 and 24.53 nm and between 3.58 and 3.75 eV depending on the increase in Li doping, respectively. The ideality factor (n) values of the diodes, which provided information about the performance of diodes, are calculated between 5.92 and 9.74. The lowest n value of 5.92 is obtained for 2% Li-doped diode. All the fabricated diodes demonstrate a good photodiode behavior, and the maximum photoresponsivity value of 6.74 Â 10 À2 A W À1 is obtained for 10% Li:TiO 2. In addition, the C-V, G-V, and R s-V characteristics of diodes are examined for different frequencies. Li doping has improved the optoelectrical performance of the TiO 2-based photodiodes. Thus, the Li:TiO 2-based photodiode can be a candidate for optoelectronic applications.

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Section: Resultsmentioning

confidence: 99%

The Optoelectrical Properties of Li: TiO₂/p‐Si Photodiodes for Various Li Doping

Rüzgar

2020

Physica Status Solidi (a)

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“…Determination of the ideality factor, series resistance, and barrier height of a Schottky diode is necessary to assess the device performance. These parameters have been derived from Cheung’s eqs 6–8 40−42 andwhere R s signifies the series resistance of the diode. The d V /dln( I ) versus I and H ( I ) versus I plots are portrayed in Figure 7.…”

Section: Results and Discussionmentioning

confidence: 99%

Three-Dimensional-Coordination Polymer of Zn(II)-Carboxylate: Structural Elucidation, Photoelectrical Conductivity, and Biological Activity

et al. 2019

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A newly designed mixed-ligand coordination polymer [Zn4(bdc)4(ppmh)2(H2O)]n (1) (H2bdc = 1,4-benzene dicarboxylic acid, ppmh = N-pyridin-2-yl-N′-pyridin-4-ylmethylene-hydrazine) has been characterized using different physicochemical techniques. The structure has been confirmed by single crystal X-ray diffraction measurements. There are two pyridyl-N and one hydrazino-imine-N donor centers in ppmh, where two pyridyl-Ns bind simultaneously to two Zn(II) to serve as a bridging agent to form a coordination polymer. The 1,4-benzene dicarboxylato (bdc) is ligated via the aromatic dicarboxylato-O to form a one-dimensional (1D) chain. These two 1D chains about Zn(II) constitute a two-dimensional structure, which undergoes noncovalent interactions (C–H···π and π···π) to generate a three-dimensional supramolecular assembly. Electrical conductivity of 1 is higher by 1 order (1.37 × 10–6 S/cm) than that of the free ligand, ppmh (6.2 × 10–7 S/cm). Especially, the responsivity of the compound 1 was 56.21 mA/W, which is 11 times higher than that of the ligand ppmh (5.12 mA/W). The specific detectivity of the compound was 2.17 × 1010 Jones, which is also almost 10 times higher with respect to the specific detectivity of the ligand-based device (4.53 × 109 Jones). The results show that the compound can be valuable for optoelectronic fields. The biological studies suggest that compound 1 is antibacterial as well as a promising anticancer agent (LD50, 42.2 μg/mL against HepG2 cells), while ligands remain silent. Investigation of the mechanism of the cell killing activity of compound 1 accounts the generation of intracellular reactive oxygen species.

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“…For better understanding of the charge transport mechanism in devices, the thermionic emission (TE) theory is used, 46 and according to this theory, the current of a diode may be stated as follows, eqs 2–4 47 wherewhere I 0 is the saturation current, q is the electronic charge, k is the Boltzmann constant, T is the temperature in kelvin, V is the forward bias voltage, η is the ideality factor, ϕ B is the effective barrier height at zero bias, A is the diode area (7.065 × 10 –6 m 2 ), and A * is the effective Richardson constant (1.20 × 10 6 A m –2 K –2 ). According to Cheung, the forward bias I – V characteristics (in terms of series resistance) may be stated as 48 eq 5 and the series resistance is calculated 49 from eqs 6–8where IR S indicates the voltage drop across the series resistance of the device.and H ( J ) can be stated asFrom the d V /dln( J ) vs J plot, the series resistance, R S , and ideality factor, η, for all of the devices in dark- and photo-conditions are determined by the slope and intercept, respectively (Figure 8). Using the y-axis intercept of the H ( J ) vs J curve, the potential barrier height (ϕ b ) for the devices is calculated, and the slope of this plot provides a second determination of the series resistance.…”

Section: Resultsmentioning

confidence: 99%

Designing of Pb(II)-Based Novel Coordination Polymers (CPs): Structural Elucidation and Optoelectronic Application

et al. 2019

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[Pb2(bdc)1.5(aiz)]n (1) and [Pb2(bdc)1.5(aiz)(MeOH)2]n (2) (H2bdc = 1,4-benzene dicarboxylic acid, aiz = (E)-N′-(thiophen-2-ylmethylene)isonicotinohydrazide) have been synthesized, and structural characterization has been established by X-ray analysis and thermogravimetric analysis (TGA). Here, bdc2– links two Pb(II) centers and the aiz ligand binds the metal centers in two different manners: chelating and monodonating. Thus, polymerizations have taken place from the combination of mixed ligand system. Optical band gaps have been studied via UV measurements. Again, the experimental and calculated (from density functional theory (DFT)) band gaps agree well and the semiconducting properties of synthesized polymeric materials have been approved. Thus, optoelectronic and photonic devices can be made by this type of coordination polymers (CPs). The I–V representative curves of 1 (device-A) and 2 (device-B) in both dark and illuminated conditions show that device-A has a higher magnitude of current than device-B. Dark- and photo-conductivity values of device-A are calculated as 2.94 × 10–6 and 6.12 × 10–6 S m–1, respectively, whereas for device-B, the values of dark- and photo-conductivity are 2.92 × 10–7 and 3.66 × 10–7 S m–1, respectively, at room temperature.

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One step hydrothermal synthesis of a rGO–TiO₂ nanocomposite and its application on a Schottky diode: improvement in device performance and transport properties

Abstract: rGO–TiO2 nanocomposite based Schottky diode shows improved performance and better transport properties compared to TiO2.

Cited by 69 publications

References 37 publications

The Optoelectrical Properties of Li: TiO₂/p‐Si Photodiodes for Various Li Doping

The Optoelectrical Properties of Li: TiO₂/p‐Si Photodiodes for Various Li Doping

Three-Dimensional-Coordination Polymer of Zn(II)-Carboxylate: Structural Elucidation, Photoelectrical Conductivity, and Biological Activity

Designing of Pb(II)-Based Novel Coordination Polymers (CPs): Structural Elucidation and Optoelectronic Application

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One step hydrothermal synthesis of a rGO–TiO2 nanocomposite and its application on a Schottky diode: improvement in device performance and transport properties

Abstract: rGO–TiO2 nanocomposite based Schottky diode shows improved performance and better transport properties compared to TiO2.

Cited by 69 publications

References 37 publications

The Optoelectrical Properties of Li: TiO2/p‐Si Photodiodes for Various Li Doping

The Optoelectrical Properties of Li: TiO2/p‐Si Photodiodes for Various Li Doping

Three-Dimensional-Coordination Polymer of Zn(II)-Carboxylate: Structural Elucidation, Photoelectrical Conductivity, and Biological Activity

Designing of Pb(II)-Based Novel Coordination Polymers (CPs): Structural Elucidation and Optoelectronic Application

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One step hydrothermal synthesis of a rGO–TiO₂ nanocomposite and its application on a Schottky diode: improvement in device performance and transport properties

The Optoelectrical Properties of Li: TiO₂/p‐Si Photodiodes for Various Li Doping

The Optoelectrical Properties of Li: TiO₂/p‐Si Photodiodes for Various Li Doping