Size- and Orientation-Dependent Photovoltaic Properties of ZnO Nanorods

Zhao, Qidong; Xie, Tengfeng; Peng, Linlin; Lin, Yanhong; Wang, Ping; Peng, and Liang; Wang, Dejun

doi:10.1021/jp075368y

Cited by 117 publications

(83 citation statements)

References 52 publications

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“…In these systems, SPV has been shown to saturate on time scales ranging between only picoseconds to microseconds [57,60], so the long-time scale effects seen for these TI surfaces can also involve photonstimulated desorption. Having said that, we do note that SPV time scales of a few minutes, comparable to the τ 1 's found in this study, have been reported for the SPV onset in ZnO nanorods [61].…”

Section: B Physical Phenomena Induced By High-flux Illuminationsupporting

confidence: 88%

Dirac states with knobs on: Interplay of external parameters and the surface electronic properties of three-dimensional topological insulators

et al. 2015

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Topological insulators are a novel materials platform with high applications potential in fields ranging from spintronics to quantum computation. In the ongoing scientific effort to demonstrate controlled manipulation of their electronic structure by external means, i.e., the provision of knobs with which to tune properties, stoichiometric variation and surface decoration are two effective approaches that have been followed. In angleresolved photoelectron spectroscopy (ARPES) experiments, both approaches are seen to lead to electronic band-structure changes. Most importantly, such approaches result in variations of the energy position of bulk and surface-related features and the creation of two-dimensional electron gases. The data presented here demonstrate that a third manipulation handle is accessible by utilizing the amount of super-band-gap light a topological insulator surface has been exposed to under typical ARPES experimental conditions. Our results show that this third knob acts on an equal footing with stoichiometry and surface decoration as a modifier of the electronic band structure, and that it is in continuous and direct competition with the latter. The data clearly point towards surface photovoltage and photoinduced desorption as the physical phenomena behind modifications of the electronic band structure under exposure to high-flux photons. We show that the interplay of these phenomena can minimize and even eliminate the adsorbate-related surface band bending on typical binary, ternary, and quaternary Bi-based topological insulators. Including the influence of the sample temperature, these data set up a detailed framework for the external control of the electronic band structure in topological insulator compounds in an ARPES setting. Four external knobs are available: bulk stoichiometry, surface decoration, temperature, and photon exposure. These knobs can be used in conjunction to fine tune the band energies near the surface and consequently influence the topological properties of the relevant electronic states.

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Section: B Physical Phenomena Induced By High-flux Illuminationsupporting

confidence: 88%

Dirac states with knobs on: Interplay of external parameters and the surface electronic properties of three-dimensional topological insulators

et al. 2015

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“…59(b). The small open circuit voltage was attributed to the dominance of differently exposed crystal facets of the nanowires [478], as also evidenced by surface photovoltage studies [479]. The energy conversion efficiency [478].…”

Section: Inorganic P-n Junction Solar Cellsmentioning

confidence: 77%

One-dimensional ZnO nanostructures: Solution growth and functional properties

2011

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One-dimensional (1D) ZnO nanostructures have been studied intensively and extensively over the last decade not only for their remarkable chemical and physical properties, but also for their current and future diverse technological applications. This article gives a comprehensive overview of the progress that has been made within the context of 1D ZnO nanostructures synthesized via wet chemical methods. We will cover the synthetic methodologies and corresponding growth mechanisms, different structures, doping and alloying, positioncontrolled growth on substrates, and finally, their functional properties as catalysts, hydrophobic surfaces, sensors, and in nanoelectronic, optical, optoelectronic, and energy harvesting devices.

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“…For the SPC mode, a comblike ITO electrode with an external bias (10.0 V) on two sides was used, [35] while for the SPV mode, a sandwich-like structure in which the samples were directly sandwiched between two blank ITO electrodes was employed. [32,33] The details of TPV system have been described previously. [38,40] As for the measurement, the sample chamber consisted of an ITO electrode, a 10 mm thick mica spacer as electron isolator (to prevent the photoinduced electrons in the semiconductor from being directly injected to the electrode), and a platinum wire gauze electrode (with a transparency of about 50 %).…”

Section: Methodsmentioning

confidence: 99%

Synthesis and Plasmon‐Induced Charge‐Transfer Properties of Monodisperse Gold‐Doped Titania Microspheres

Wang

Xie

et al. 2009

Chemistry A European J

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Monodisperse gold-doped titania microspheres have been synthesized under high concentration of a titanium precursor (9.34 mM) by introducing a trace amount of chloroauric acid (CA) into the reaction system; the size of the microspheres can be easily tuned (from approximately 587 to approximately 392 nm) by varying the amount of the CA added. The plausible formation mechanism has been discussed in detail. Chloroauric acid was found to act as the stabilizing agent to induce the formation of monodisperse colloidal spheres. Gold-doped anatase titania spheres with approximately 7 nm gold nanodots on the surface were synthesized by calcination. Interestingly, results from surface photocurrent, surface photovoltage, and transient photovoltage measurements indicate that the gold nanodots exhibit different electronic properties when the gold-doped anatase titania spheres were illuminated by different wavelengths of light: one is an electron acceptor in the UV region, while the other is an electron donor in the visible region. Furthermore, the decay time of the injected plasmon-induced electrons was found to be on the millisecond timescale and increased with increasing amounts of gold doped.

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Size- and Orientation-Dependent Photovoltaic Properties of ZnO Nanorods

Cited by 117 publications

References 52 publications

Dirac states with knobs on: Interplay of external parameters and the surface electronic properties of three-dimensional topological insulators

Dirac states with knobs on: Interplay of external parameters and the surface electronic properties of three-dimensional topological insulators

One-dimensional ZnO nanostructures: Solution growth and functional properties

Synthesis and Plasmon‐Induced Charge‐Transfer Properties of Monodisperse Gold‐Doped Titania Microspheres

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