Illumination Intensity-Dependent Electronic Properties in Quantum Dot Sensitized Solar Cells

Shalom, Menny; Tachan, Zion; Bouhadana, Yaniv; Barad, Hannah‐Noa; Zaban, Arie

doi:10.1021/jz200863j

Cited by 41 publications

(42 citation statements)

References 48 publications

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“…The V OC of the plasmonic cell is 918 mV, and that for the non‐plasmonic cell is 878 mV. The enhancement in V OC by 40 mV is due to two reasons: (i) the reduced electron‐hole recombination in the mid‐gap or trap states and decreased back electron transfer to the electrolyte, for the Au−Ag (3:1) alloy NPs, in the vicinity of the QDs serve as electron conduits, and promote charge transfer to FTO and (ii) the upward shift of the Fermi level of the TiO 2 /CdS/Ag−Au film to more negative potentials ( versus NHE), compared to TiO 2 /CdS. In the presence of the alloy NPs, the quasi Fermi level of TiO 2 /CdS equilibrates with that of the Au−Ag (3:1) alloy NPs, as shown in the energy band diagram (Figure c).…”

Section: Resultsmentioning

confidence: 99%

Bimetallic Au-Ag Alloy Nanoparticles Improve Energy Harvesting of a TiO₂/CdS Film

et al. 2016

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Recent leapfrogging of power conversion efficiencies of quantum dot solar cells (QDSCs) have catapulted them to the forefront of low cost photovoltaic cells. Here, bimetallic AuÀAg (3:1) alloy nanoparticles (NPs) are embedded in a TiO 2 /CdS film to yield a TiO 2 /CdS/AuÀAg (3:1) film. Charge carriers in the QDSC with the TiO 2 /CdS/AuÀAg (3:1) film upon illumination are produced via three distinctive mechanisms: inherent electronhole pairs formed in CdS, e À -h + pairs formed in CdS by the absorption of the increased electric field halo around the vicinal alloy NPs, and by the excitation of electrons to mid-gap states of CdS by absorption of longer wavelengths scattered by the alloy NPs. The high electrical conductivity of AuÀAg (3:1) alloy NPs facilitates electron transport in the TiO 2 /CdS/AuÀAg (3:1) film and the Fermi level shift to more negative potentials (versus normal hydrogen electrode) induced by the alloy, increases photovoltage and suppresses electron recombination. The champion plasmonic QDSC with the TiO 2 /CdS/AuÀAg (3:1) film delivered a PCE of 4.94 %, which is greater by 52 % compared to the non-plasmonic cell. The plasmonic cell exhibits enhanced external quantum efficiencies (EQEs) in the blue-green region, and the EQE is finite in the red region as well. We expect that the findings for improved energy harvesting induced by AuÀAg (3:1) alloy NPs in this work will furnish useful design ideas for developing plasmonic cells with a variety of other QDs.

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Section: Resultsmentioning

confidence: 99%

Bimetallic Au-Ag Alloy Nanoparticles Improve Energy Harvesting of a TiO₂/CdS Film

et al. 2016

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“…We can assume that QDs have a PV response upon illumination resulting in the generation of photocurrent and voltage; they continue to charge up to a state which changes the relative energy within the cell and ultimately affects the methods of generation and recombination. [56] 3. Synthesis methods of CdSe QDs QD particles are processed by solution methods, which typically involve the chemical reaction of a non-coordinated highboiling-point solvent that reduces the melting point of the semiconductor materials treated.…”

Section: Basic Principles Of Qdsscsmentioning

confidence: 99%

“…The entire photocurrent generation is illustrated in Figure 3. We can assume that QDs have a PV response upon illumination resulting in the generation of photocurrent and voltage; they continue to charge up to a state which changes the relative energy within the cell and ultimately affects the methods of generation and recombination [56] …”

Section: Basic Principles Of Qdsscsmentioning

confidence: 99%

Cadmium Selenide Quantum Dots for Solar Cell Applications: A Review

Rahman

Karim

Alharbi

et al. 2021

Chemistry An Asian Journal

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Quantum dot-sensitized solar cells (QDSSCs) are significant energy-producing devices due to their remarkable capability to growing sunshine and produce many electrons/ holes pairs, easy manufacturing, and low cost. However, their power conversion efficiency (4%) is usually worse than that of dye-sensitized solar cells (� 12%); this is mainly due to their narrow absorption areas and the charge recombination happening at the quantum dot/electrolyte and TiO 2 /electrolyte interfaces. Thus, to raise the power conversion efficiency of QDSSC, new counter electrodes, working electrodes, sensitizers, and electrolytes are required. CdSe thin films have shown great potential for use in photodetectors, solar cells, biosensors, light-emitting diodes, and biomedical imaging systems. This article reviews the CdSe nanomaterials that have been recently used in QDSSCs as sensitizers. Their size, design, morphology, and density all noticeably influence the electron injection efficiency and light-harvesting capacity of these devices. A detailed overview of the development of QDSSCs is presented, including their basic principles, the synthesis methods for their CdSe quantum dots, and the device fabrication processes. Finally, the challenges and opportunities of realizing high-performance CdSe QDSSCs are discussed and some future directions are suggested.

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“…Later, another QDSSC with a better photoelectric conversion efficiency (6.5%) was developed [8]. Shalom et al [10] used a DSSC consisting of a photoelectrode by directly depositing QDs onto an FTO glass to quantify the lifetime and density of the photogenerated electrons within the QD layer. The authors verified that the electronic properties in quantum dot-sensitized solar cells are illumination intensitydependent.…”

Section: Introductionmentioning

confidence: 99%

Sb₂S₃Quantum-Dot Sensitized Solar Cells with Silicon Nanowire Photoelectrode

Hsieh

Lee

Wang

2015

International Journal of Photoenergy

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We propose a novel quantum-dot sensitized solar cell (QDSSC) structure that employs a quantum dot/semiconductor silicon (QD/Si) coaxial nanorod array to replace the conventional dye/TiO2/TCO photoelectrode. We replaced the backlight input mode with top-side illumination and used a quantum dot to replace dye as the light-absorbing material. Photon-excited photoelectrons can be effectively transported to each silicon nanorod and conveyed to the counter electrode. We use two-stage metal-assisted etching (MAE) to fabricate the micro-nano hybrid structure on a silicon substrate. We then use the chemical bath deposition (CBD) method to synthesize a Sb2S3quantum dot on the surface of each silicon nanorod to form the photoelectrode for the quantum dot/semiconductor silicon coaxial nanorod array. We use a xenon lamp to simulate AM 1.5 G (1000 W/m2) sunlight. Then, we investigate the influence of different silicon nanorod arrays and CBD deposition times on the photoelectric conversion efficiency. When an NH (N-type with high resistance) silicon substrate is used, the QD/Si coaxial nanorod array synthesized by three runs of Sb2S3deposition shows the highest photoelectric conversion efficiency of 0.253%. The corresponding short-circuit current density, open-circuit voltage, and fill factor are 5.19 mA/cm2, 0.24 V, and 20.33%, respectively.

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Illumination Intensity-Dependent Electronic Properties in Quantum Dot Sensitized Solar Cells

Cited by 41 publications

References 48 publications

Bimetallic Au-Ag Alloy Nanoparticles Improve Energy Harvesting of a TiO₂/CdS Film

Bimetallic Au-Ag Alloy Nanoparticles Improve Energy Harvesting of a TiO₂/CdS Film

Cadmium Selenide Quantum Dots for Solar Cell Applications: A Review

Sb₂S₃Quantum-Dot Sensitized Solar Cells with Silicon Nanowire Photoelectrode

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Illumination Intensity-Dependent Electronic Properties in Quantum Dot Sensitized Solar Cells

Cited by 41 publications

References 48 publications

Bimetallic Au-Ag Alloy Nanoparticles Improve Energy Harvesting of a TiO2/CdS Film

Bimetallic Au-Ag Alloy Nanoparticles Improve Energy Harvesting of a TiO2/CdS Film

Cadmium Selenide Quantum Dots for Solar Cell Applications: A Review

Sb2S3Quantum-Dot Sensitized Solar Cells with Silicon Nanowire Photoelectrode

Contact Info

Product

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Bimetallic Au-Ag Alloy Nanoparticles Improve Energy Harvesting of a TiO₂/CdS Film

Bimetallic Au-Ag Alloy Nanoparticles Improve Energy Harvesting of a TiO₂/CdS Film

Sb₂S₃Quantum-Dot Sensitized Solar Cells with Silicon Nanowire Photoelectrode