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Thermo-mechanical behavior of low-dimensional systems: The local bond average approach

The interaction of microwaves with carbon nanotubes (CNTs) is an interesting topic for a variety of potential applications. Microwaves have been used for the purification of CNTs and for their chemical functionalization, providing a technique for simple, green, and large-scale protocols. In addition, the selective destruction of metallic CNTs under microwave irradiation could potentially result in a batch of semiconducting-only nanotubes. As an innovative application, the combination of microwaves with well-aligned CNTs could produce a new illumination technology. Moreover, the microwave absorbing properties of CNTs and their different behavior from typical organic compounds may open the door to the preparation of a wide range of new materials useful in many fields. A few examples of practical applications include electromagnetic interference for protecting the environment from radiation and microwave hyperthermia for cancer treatment as well as other medical therapies requiring precise heating of biological tissues.

Carbon Nanotubes and Microwaves: Interactions, Responses, and Applications

The low cost and high quality of multicrystalline silicon (mc-Si) based on directional solidification has become the main stream in photovoltaic (PV) industry. The mc-Si quality affects directly the conversion efficiency of solar cells, and thus, it is crucial to the cost of PV electricity. With the breakthrough of crystal growth technology, the so-called high-performance mc-Si has increased about 1% in solar cell efficiency from 16.6% in 2011 to 17.6% in 2012 based on the whole ingot performance. In this paper, we report our development of this high-performance mc-Si. The key ideas behind this technology for defect control are discussed. With the high-performance mc-Si, we have achieved an average efficiency of near 17.8% and an open-circuit voltage (Voc) of 633 mV in production. The distribution of cell efficiency was rather narrow, and low-efficiency cells (<17%) were also very few. The power of the 60-cell module using the high-efficiency cells could reach 261 W as well. Copyright © 2013 John Wiley & Sons, Ltd.

Development of high‐performance multicrystalline silicon for photovoltaic industry

Synthesis and morphology control of ZnO nanostructures in microemulsions

Growth of structure-controlled polycrystalline silicon ingots for solar cells by casting

Directional growth method to obtain high quality polycrystalline silicon from its melt

In situ observation of Si faceted dendrite growth from low-degree-of-undercooling melts

Transition-metal (Mo, Mn, Fe, Rh, Ti, Cu, Zn) doping was carried out on the borosilicide compound REB44Si2 (RE = rare earth). REB44Si2 compounds exhibit Seebeck coefficients greater than 200 µV K−1 at high temperatures and unlike most compounds, the figure of merit shows a steep increase at T > 1000 K making them promising high-temperature thermoelectric materials. Although zinc itself does not remain in the final product, zinc doping was found to improve the crystal quality, which has been a long-standing problem for the borosilicides. As a result, a significant increase of the thermoelectric power factor by more than 30% was achieved.

Akiko Nomura

Papers

Growth of structure-controlled polycrystalline silicon ingots for solar cells by casting

Directional growth method to obtain high quality polycrystalline silicon from its melt

In situ observation of Si faceted dendrite growth from low-degree-of-undercooling melts

Effect of Zn doping on improving crystal quality and thermoelectric properties of borosilicides

X-ray photoelectron spectroscopic studies on initial oxidation of iron and manganese mono-silicides