Photoelectrochemical Investigations of Semiconductor Nanoparticles and Their Application to Solar Cells

Poppe, Jan; Hickey, Stephen G.; Eychmüller, Alexander

doi:10.1021/jp5016092

Cited by 24 publications

(14 citation statements)

References 189 publications

(299 reference statements)

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“…The investigated samples were obtained by linking nanorods via (3‐mercaptopropyl)trimethoxysilane (MPTMS) to conductive ITO glasses. Photographs of the investigated sample are shown in the supporting information (Figure SI‐1).This procedure is known from preceding photoelectrochemical studies and was also applied to prepare sensors ,,…”

Section: Resultsmentioning

confidence: 99%

Spectroelectrochemical Investigation of the Charge Carrier Kinetics of Gold‐Decorated Cadmium Chalcogenide Nanorods

et al. 2017

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The interfacial transfer of charge carriers across the semiconductor nanoparticle/electrolyte boundary is an elementary process for applications such as photoelectrochemical sensing and photocatalysis. This mechanism is investigated for systems based on complex shaped semiconductor and metal-semiconductor nano-heteroparticles. In the present work the influence of the presence of a CdSe domain within the CdS nanorod as well as the influence of gold domain decoration is investigated spectroelectrochemically. Therefore, the mentioned nanoparticles are linked to transparent indium tin oxide (ITO) glass slides via (3-mercaptopropyl)trimethoxysilane (MPTMS). This preparation yields sub-monolayers of the particles. External photocurrent quantum efficiency spectra are measured in the range from l = 350-650 nm. Intensity-modulated photocurrent spectroscopy (IMPS) and electrochemical impedance spectroscopy (EIS) measurements are applied to the samples in order to reveal and explain the differences of the electrochemical kinetics between the four different particle types (CdS, CdSe/ CdS, CdSÀAu, and CdSe/CdSÀAu nanorods). We demonstrate that the presence of gold domains affects the carrier dynamics of various involved processes. An equivalent circuit model is derived and fitted to the impedance data to explain changes of the kinetics in the system.

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Section: Resultsmentioning

confidence: 99%

Spectroelectrochemical Investigation of the Charge Carrier Kinetics of Gold‐Decorated Cadmium Chalcogenide Nanorods

et al. 2017

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“…[11][12][13][14] Improving the characteristics and quality of QDs regarding synthetic Figure 1 a, a stable interface between the MeOH solution and the underlying NaCl-QD mixture instead of an instantaneous mixing is crucial for a successful crystallization. Through the subsequent diffusion of MeOH into water and the thereby reduced solubility, NaCl crystals with incorporated CdTe QDs are formed within hours.…”

Section: Introductionmentioning

confidence: 99%

“…In the last three decades since their fi rst reports appeared, [1][2][3][4][5] colloidal semiconductor quantum dots (QDs) attracted continuously increasing interest in different fi elds, including photonics [6][7][8][9][10] and optoelectronics. [11][12][13][14] Improving the characteristics and quality of QDs regarding synthetic Figure 1 a, a stable interface between the MeOH solution and the underlying NaCl-QD mixture instead of an instantaneous mixing is crucial for a successful crystallization. Through the subsequent diffusion of MeOH into water and the thereby reduced solubility, NaCl crystals with incorporated CdTe QDs are formed within hours.…”

Section: Introductionmentioning

confidence: 99%

Liquid–Liquid Diffusion‐Assisted Crystallization: A Fast and Versatile Approach Toward High Quality Mixed Quantum Dot‐Salt Crystals

Adam

Wang

Dubavik

et al. 2015

Adv Funct Materials

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2638www.MaterialsViews.com wileyonlinelibrary.com approaches, [ 15,16 ] effi ciency, [ 17,18 ] extending their spectral range [19][20][21] and environmental friendliness using less toxic materials [22][23][24] sparked industrial applications. Those started with the demonstration of a 40 in. display prototype presented by Samsung [ 25 ] and followed by the foundation of QD Vision, Inc., [ 26 ] whose QDs are now used in the latest series of Sony products. All of the mentioned applications require long-term stability of the QDs under various conditions including high temperatures as well as high intensity illumination. Packaging of the QDs within polymer or inorganic matrices is one way to address these issues, while improving the processability of the QDs at the same time. Commonly used polymers, such as polystyrene and poly(methylmethacrylate) [ 27 ] are relatively less stable and tight in comparison to their inorganic counterparts. Inorganic matrices on the other hand can incorporate the QDs directly from their melt, e.g., using the Czochralski approach, [ 28 ] coated as a thin fi lm directly on their surface [ 29,30 ] or, as recently developed by our group, grown as mixed crystals at ambient temperatures from a saturated salt solution. [ 31 ] Using this method, different types of QDs can be incorporated due to the low thermal stress and, by choosing the proper matrix-QD system, the photoluminescence quantum yields (PL-QYs) are enhanced upon incorporation. [ 32,33 ] Here, a new, fast, and versatile method for the incorporation of colloidal quantum dots (QDs) into ionic matrices enabled by liquid-liquid diffusion is demonstrated. QDs bear a huge potential for numerous applications thanks to their unique chemical and physical properties. However, stability and processability are essential for their successful use in these applications. Incorporating QDs into a tight and chemically robust ionic matrix is one possible approach to increase both their stability and processability. With the proposed liquid-liquid diffusion-assisted crystallization (LLDC), substantially accelerated ionic crystallization of the QDs is shown, reducing the crystallization time needed by one order of magnitude. This fast process allows to incorporate even the less stable colloids including initially oil-based ligandexchanged QDs into salt matrices. Furthermore, in a modifi ed two-step approach, the seed-mediated LLDC provides the ability to incorporate oilbased QDs directly into ionic matrices without a prior phase transfer. Finally, making use of their processability, a proof-of-concept white light emitting diode with LLDC-based mixed QD-salt fi lms as an excellent color-conversion layer is demonstrated. These fi ndings suggest that the LLDC offers a robust, adaptable, and rapid technique for obtaining high quality QD-salts.

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“…[64,75] Most photocatalysts are semiconductors, due to the relatively high stability and mobility of charge carriers in these materials, which facilitates the transport of electrons to the surface. [73][74]76] Among various metal oxide semiconductor photocatalysts, titanium dioxide (TiO2) is currently recognized as the most suitable material for environmental applications, due to its high chemical inertness and photo-stability as well as strong oxidizing power and low cost. [77] TiO2 is an n-type semiconductor due to the low amount of oxygen vacancies on the surface that is compensated by the presence of Ti 3+ centers.…”

Section: Photocatalysismentioning

confidence: 99%

Hierarchically Structured Nanomaterials for Electrochemical Energy Conversion

et al. 2015

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Hierarchical nanomaterials are highly suitable as electrocatalysts and electrocatalyst supports in electrochemical energy conversion devices. The intrinsic kinetics of an electrocatalyst are associated with the nanostructure of the active phase and the support, while the overall properties are also affected by the mesostructure. Therefore, both structures need to be controlled. A comparative state-of-the-art review of catalysts and supports is provided along with detailed synthesis methods. To further improve the design of these hierarchical nanomaterials, in-depth research on the effect of materials architecture on reaction and transport kinetics is necessary. Inspiration can be derived from nature, which is full of very effective hierarchical structures. Developing fundamental understanding of how desired properties of biological systems are related to their hierarchical architecture can guide the development of novel catalytic nanomaterials and nature-inspired electrochemical devices.

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Photoelectrochemical Investigations of Semiconductor Nanoparticles and Their Application to Solar Cells

Cited by 24 publications

References 189 publications

Spectroelectrochemical Investigation of the Charge Carrier Kinetics of Gold‐Decorated Cadmium Chalcogenide Nanorods

Spectroelectrochemical Investigation of the Charge Carrier Kinetics of Gold‐Decorated Cadmium Chalcogenide Nanorods

Liquid–Liquid Diffusion‐Assisted Crystallization: A Fast and Versatile Approach Toward High Quality Mixed Quantum Dot‐Salt Crystals

Hierarchically Structured Nanomaterials for Electrochemical Energy Conversion

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