Billerica, MA, United States
Billerica, MA, United States

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Peelamedu R.D.,BTU International Inc. | Seccombe D.A.,BTU International Inc.
Ceramic Engineering and Science Proceedings | Year: 2016

The interaction of microwave energy (MW) with battery binders and coating materials can dry the electrodes faster compared to conventional methods that are currently being used in the battery industry. The main objectives of this study are (i) to obtain proof of concept of the BTU's hybrid microwave process with minimal microstructure damage, and (ii) to demonstrate an acceptable coin cell performance prepared using MW dried electrodes. These electrodes were microwave dried under various conditions before they were measured for rate performance and cyclic testing. The moisture levels were measured using Karl-Fisher titration. The results showed that the electrodes prepared using NMP solvent had a much lower moisture levels when compared to electrodes prepared using an aqueous solvent. Presence of high moisture levels in aqueous based electrodes did not show any significant effects in cell performance tests.


Richter P.J.,BTU International Inc. | Bottari F.J.,BTU International Inc. | Wong D.C.,BTU International Inc.
Conference Record of the IEEE Photovoltaic Specialists Conference | Year: 2010

Inline wet chemical phosphorus coating and thermal diffusion in a conveyor furnace is a high-throughput alternative to the conventional batch POCl 3 process. There is now significant interest in the adoption of inline diffusion on an industrial scale in order to achieve a continuous flow, low-cost process which interfaces well with other inline processing steps. A concern about inline diffusion in conveyor furnaces has been the potential for conveyor belts to contribute to wafer contamination. The objective of this study is to use Secondary Ion Mass Spectrometry (SIMS) to (i) determine if commonly used nickel alloy conveyor belts are a potential source of wafer metal contamination during the diffusion firing and (ii) to investigate the effectiveness of phosphorus coating and the resulting post-diffusion phosphosilicate glass (PSG) to act as a contaminant isolating barrier, or trapping layer. We report SIMS depth and concentration profiles of Ni, Cr, and Fe, which indicate that the phosphosilicate glass produced during the diffusion process acts as an effective trap of metal contaminants. © 2010 IEEE.


Peelamedu R.D.,BTU International Inc. | Seccombe D.A.,BTU International Inc.
Ceramic Engineering and Science Proceedings | Year: 2014

The interaction of microwave energy with materials can result in direct heating and bring the energy and operational costs down compared to a convection/radiant heat transfer process. The difficulty in controlling uniformity over a wide area has become a limiting factor for this technology to become successful in industries. In this paper, we report a hybrid microwave inline system that is capable of processing large sized samples at high temperatures. Keeping the cost of ownership issues in mind, this new inline system was formulated, designed and built at me BTU facility located at North Billerica. This in-line MW system has the capability to operate anywhere between 100°C to 1150°C in a continuous manner for several hours without any interruption, making it convenient for various manufacturing type environments. A unique feature of this system is very high degree of uniformity across me width of the belt even at elevated temperatures. As an example, at 1150°C, the measured uniformity level across a 28'' width belt was ± 2°C. High power microwave chokes were internally designed and installed to prevent any leakage of microwave power at the entrance and exit ports. At all power levels and temperatures, the leakage was measured well below the OSHA/FDA safety limits, keeping the safety of operating personnel very high. High performance metallic belt was used to carry samples in and out of the system continuously. The system was operated semi-automatically with a very efficient control module, which is used to automatically control temperature of the internal zones. Case studies such as P-diffusion in Si wafer, B-diffusion in Si wafer, Ceramics sintering and material activation are some experiments that will be discussed to sufficient detail. Copyright © 2015 by The American Ceramic Society.


Patent
BTU International Inc. | Date: 2015-05-22

A method is provided for the simultaneous diffusion of dopants of different types on respective sides of a solar cell wafer in a single stage process. The dopants are applied to respective sides of the wafer in wet chemical form preferably by pad printing. The doping materials can be applied to the entire wafer surface or effective area thereof, or can be applied in a pattern to suit the intended solar cell configuration. In a typical embodiment, the dopants are boron and phosphorus.


Patent
BTU International Inc. | Date: 2015-06-11

A high temperature conveyor belt is provided having a non-metallic conveying surface which will not scratch, abrade or otherwise mar the surface of a product being carried on the belt through a furnace and which will not contaminate the product. In one embodiment, the conveyor comprises a high temperature fabric belt attached to a metal belt which may be a conventional woven metal conveyor belt. In another embodiment, the conveyor is composed of a non-metallic high temperature strand which is woven or threaded through a metal belt to provide a non-metallic conveying surface. In a further embodiment, the non-metallic product support elements are coupled to roller chains at each side of the furnace chamber and which are cooperative with a drive mechanism to transport the conveyor through the furnace. The roller chains can be located outside of the furnace chamber to avoid exposure to the high temperature of the furnace chamber.


Patent
BTU International Inc. | Date: 2013-09-26

A high temperature conveyor belt is provided having a non-metallic conveying surface which will not scratch, abrade or otherwise mar the surface of a product being carried on the belt through a furnace and which will not contaminate the product. In one embodiment, the conveyor comprises a high temperature fabric belt attached to a metal belt which may be a conventional woven metal conveyor belt. In another embodiment, the conveyor is composed of a non-metallic high temperature strand which is woven or threaded through a metal belt to provide a non-metallic conveying surface. In a further embodiment, the non-metallic product support elements are coupled to roller chains at each side of the furnace chamber and which are cooperative with a drive mechanism to transport the conveyor through the furnace. The roller chains can be located outside of the furnace chamber to avoid exposure to the high temperature of the furnace chamber.


Patent
BTU International Inc. | Date: 2013-10-07

A furnace system for thermal processing of products and materials is disclosed which is particularly useful in processing touch screens for computer tablets and silicon wafers employed in fabricating solar cells. The system employs a hybrid of microwave and radiant heating of workpieces to provide controlled heating of the workpieces. A plurality of susceptors are disposed a furnace chamber. A plurality of microwave sources are arranged to provide microwave radiation in the chamber to uniformly heat workpieces in the chamber and to provide uniform heating of the susceptors. The susceptors are effective upon microwave heating by the microwave sources to provide uniform radiant heating of the workpieces in the chamber.


Patent
BTU International Inc. | Date: 2015-02-17

The present invention comprises a thermal reactor and method for thermal processing of particles carried in a gas stream through the reactor. The reactor system can operate in a continuous manner for the thermal processing of particles flowing through the reactor. The system in one embodiment employs a hybrid of microwave and radiant heating of the particles. In other embodiments, only microwave heating is employed, or only radiant heating is employed.


Trademark
BTU International Inc. | Date: 2010-02-23

Industrial furnaces for metallization of substrates and solar cell parts.

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