Effect of Cu2+ ions doped on the photovoltaic features of CdSe quantum dot sensitized solar cells

Physica Status Solidi (a)

2020

Cd1−2xAg2xSe films (as 0% ≤ x ≤ 5%, at%) are synthesized by chemistry method for fabricating anodes in optoelectronic devices. Further, the structural, optical, and electrical properties of the ternary film are extensively investigated. The structural properties of the Cd1−2xAg2xSe anodes are characterized using X‐ray diffraction (XRD) which confirms the cubic structure in the anodes. The optical properties of the thin films are recorded by UV–vis with an effect of metal dopants. Those results are incorporated with Tauc correlation to determine the optical parameters, valence band and conduction band positions, steepness parameter, and electron–phonon interaction in the samples. In addition, the electrical characteristics of thin films are analyzed using their photocurrent density curves, and the characteristic resistances in the optoelectronic devices are determined using the electrochemical impedance spectrum.

Section: Introductionmentioning

confidence: 99%

Influential Ag Concentration in Optical–Electrical Properties of Cd_1–2xAg_2xSe Photoanodes for Quantum‐Dot‐Sensitized Solar Cell Applications

Physica Status Solidi (a)

2020

“…This process was repeated a total of 3 times SILAR. The detailed preparation process of electrolyte and counter electrode is listed in Ref [13].…”

Section: Methodsmentioning

confidence: 99%

“…In recent times, metal ions doped into the QDs can be replaced by single QDs and a cosensitized system to reduce achievable recombination [13][14][15][16][17][18][19][20][21][22][23] because it can be improved by charge collection and transfer process. In addition, metal ions are famous for its lowest resistance and large mobility.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, metal ions are famous for its lowest resistance and large mobility. For example, Nguyen and colleagues achieved a performance of 4.22% as Cu 2+ ion doped into CdSe QDs due to its good optical and magnetic properties as compared with each other [13]. The improved properties can be archived by doping metal in QDs like Ref [14,15], [19][20][21][22][23] that can boost absorption of photons and the current density of devices.…”

Section: Introductionmentioning

confidence: 99%

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The Optimized Thickness of Silver Doping on CdS/CdSe for Quantum Dot-Sensitized Solar Cell

International Journal of Photoenergy

2019

Overall, CdSe:Ag + quantum dots were prepared by the successive ionic layer absorption and reaction method using two solutions: mixing molar concentrations of 0.003 mM AgNO 3 and a Cd(CH 3 COO) 2 ·2H 2 O anion to make solution 1 and 2.27 g Se powder and 0.6 M Na 2 SO 3 were dissolved in 100 ml deionized water, solution 2. The FTO was coated with TiO 2 nanoparticles and then was dipped in both solutions, which created a FTO/TiO 2 /CdSe:Ag + photoanode with a thickness of 1 layer to 4 layers. The layers of the CdSe:Ag + film show an effect on the morphology, crystalline structure, optical properties, and photovoltaic through optical and photovoltaic measurements. Finally, the performance of the device based on a FTO/TiO 2 /CdSe:Ag + photoanode with the different thickness increased significantly to exactly 3.96%. Moreover, in the pattern of an explanation of the optical and photovoltaic properties of materials, we use Tauc's theory to determine the band gap, the conduction band, and the valence band.

“…In recent times, metal ions doped into the QDs can be replaced by the single QDs and co-sensitized system to reduce achievable recombination (Hodes et al, 1987;Fang et al, 1997Fang et al, , 2011Gratzel, 2001Gratzel, , 2003William Yu et al, 2003;Shen and Lee, 2008;Fan et al, 2009;Gimenez et al, 2009;Zhuge et al, 2009;Gonzalez-Pedro et al, 2010;Schmid, 2014;Tan Phat et al, 2018) because it can improve the charge collection and transfer process. In addition, metal ions are famous for their lowest resistance and large mobility.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cd1-xMnxSe Alloy Thickness on the Optical and Photovoltaic Properties of Quantum Dot-Sensitized Solar Cells

2019

Front. Mater.

In this work, the Cd 1−x Mn x Se alloy was successfully prepared using a successive ionic layer adsorption and reaction method to investigate the layers' effect on the properties of devices while concentration dopant was optimized at 20% (molar concentrations between Mn 2+ and Cd 2+ ions in the Cd 1−x Mn x Se material). The layers of the Cd 1−x Mn x Se alloy play a role in improving the optical, photovoltaic, and electrochemical properties of the solar cells. Hence, the efficiency performance of devices based on the Cd 1−x Mn x Se alloy reached ∼3.8%. Besides, in order to explain this result, the experimental I-V curve was also used to determine the resistances at the interfaces and the resistance diffusion of the devices. This dynamic resistance can be compared with that of electrochemical impedance spectra.