Photosensitization of ZnO Crystals with Iodide-Capped PbSe Quantum Dots

© 2016 American Chemical Society. Lead selenide (PbSe) quantum dots (QDs) are an attractive material for application in photovoltaic devices due to the ability to tune their band gap, efficient multiple exciton generation, and high extinction coefficients. However, PbSe QDs are quite unstable to oxidation in air. Recently there have been multiple studies detailing postsynthetic halide treatments to stabilize lead chalcogenide QDs. We exploit iodide-stabilized PbSe QDs in a model QD-sensitized solar cell configuration where zinc oxide (ZnO) single crystals are sensitized using cysteine as a bifunctional linker molecule. Sensitized photocurrents stable for >1 h can be measured in aqueous KI electrolyte that is usually corrosive to QDs under illumination. The spectral response of the sensitization extended out to 1700 nm, the farthest into the infrared yet observed. Hints of the existence of multiple exciton generation and collection as photocurrent, as would be expected in this system, are speculated and discussed

Introduction to the PE&RS special issue on advances in terrestrial lidar techniques and applications

Author name used in this publication: Bruce King2011-2012 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

New State Record of the Psyllid Heterotrioza chenopodii (Reuter, 1876) (Hemiptera: Psylloidea: Triozidae) for Hawaii

We report the first state record of a widespread palaearctic psyllid species, Heterotrioza chenopodii (Reuter, 1876), for the state of Hawaii. This species belongs to a small genus of 13 species feeding exclusively on host plants in the plant family Amaranthaceae (Lauterer 1982, Burckhardt and Ouvrard 2012, Ouvrard 2019). Recorded host genera are Atriplex, Beta, Chenopodium, and Spinacia (Ouvrard 2019). In Hawaii, a likely host plant is Atriplex suberecta, and possibly A. semibaccata and Chenopodium oahuense

Probing the Relative Photoinjection Yields of Monomer and Aggregated Dyes into ZnO Crystals.

Cyanine dyes, often used in dye-sensitized solar cells (DSSCs), form a range of molecular species from monomers to large H and J aggregates in both solution and when adsorbed at a photoelectrode surface. To determine the relative capability of the different dye species to inject photoexcited electrons into a wideband gap oxide semiconductor, sensitization at a single-crystal zinc oxide surface was studied by simultaneous attenuated reflection (ATR) ultraviolet-visible (UV-vis) absorption and photocurrent spectroscopy measurements. ATR measurements enable identification of the dye species populating the surface with simultaneous photocurrent spectroscopy to identify the contribution of the various dye forms to photocurrent signal. We study the dye 2,2'-carboxymethylthiodicarbocyanine bromide that is particularly prone to aggregation both in solution and at the surface of sensitized oxide semiconductors

An assessment of shadow enhanced urban remote sensing imagery of a complex city - Hong Kong

Author name used in this manuscript: Bruce A. KingRefereed conference paper2012-2013 > Academic research: refereed > Refereed conference paperVersion of RecordPublishe

Influence of management and environment on Australian wheat: information for sustainable intensification and closing yield gaps

In the future, agriculture will need to produce more, from less land, more sustainably. But currently, in many places, actual crop yields are below those attainable. We quantified the ability for agricultural management to increase wheat yields across 179 Mha of potentially arable land in Australia. Using the Agricultural Production Systems Simulator (APSIM), we simulated the impact on wheat yield of 225 fertilization and residue management scenarios at a high spatial, temporal, and agronomic resolution from 1900 to 2010. The influence of management and environmental variables on wheat yield was then assessed using Spearman\u27s non-parametric correlation test with bootstrapping. While residue management showed little correlation, fertilization strongly increased wheat yield up to around 100 kg N ha−1 yr−1. However, this effect was highly dependent on the key environment variables of rainfall, temperature, and soil water holding capacity. The influence of fertilization on yield was stronger in cooler, wetter climates, and in soils with greater water holding capacity. We conclude that the effectiveness of management intensification to increase wheat yield is highly dependent upon local climate and soil conditions. We provide context-specific information on the yield benefits of fertilization to support adaptive agronomic decision-making and contribute to the closure of yield gaps. We also suggest that future assessments consider the economic and environmental sustainability of management intensification for closing yield gaps

Conceptual issues regarding the development of underground railway laser scanning systems

Author name used in this publication: Bruce King2014-2015 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Study on the dynamics of algal bloom and its influence factors in Tolo Harbour, Hong Kong

Author name used in this publication: Y. S. LiAuthor name used in this publication: Onyx W. H. WaiAuthor name used in this publication: B. King2004-2005 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Deformation analysis of the unified lunar control networks

2009-2010 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Disbond Detection and Characterization Using Horizontally Polarized Shear Waves and EMAT Probes

Horizontally polarized shear waves offer high sensitivity for inspection of adhesively bonded structures. They produce a strong shear deformation on the adherent-adhesive interface allowing a relatively direct estimation of the adhesive failure (disbonds). Compared to localized conventional point-by-point ultrasonic waves, horizontal shear guided waves can be launched over long distances and larger areas of structural parts can be covered. Guided horizontal shear waves have a multimodal character and do not exhibit mode conversion at interfaces. The first fundamental symmetric shear mode (HS0) propagates non-dispersively in isotropic materials, while higher orders modes are dispersive and behave as guided Lamb waves