AI-doping DL effects in MBE GaAs In a joint collaboration between Swedish and Pa- ldstani labs, the effect of Al- doping on deep levels in MBE-grown GaAs has been reported. In J. AppL Phys. 78, 5035, 1995, Umar S. Qurashi, M. Zafar Iqbal and N. Baber of the Semi- conductor Physics Labora- t o r y , D e p a r t m e n t o f Physics, Quaid-i-Azam Uni- versity, Islamabad, Pakistan, and T.G. Andersson of the Department of Physics,

Chalmers University of Technology, Goteborg, Sweden, performed a DLTS investigation of two differ- ent composiitions of AI- GaAs detecting at least nine different deep levels. These have been charac- terised and compared with M levels normally found in MBE n-GaAs. Emission rates have been found to shift to higher values inversely wi th AI concent ra t ion , due, it is considered, to

lattice strain and random alloy effects. Relative con- centrations of DLs were seen to undergo large changes as the AI concen- tration is increased from 0.1 to 1% - up to 0.1% does not seem to reduce DL concentration in contrast to other isovalent dopant behaviour in MBE GaAs.

A short report on this work appeared in the Oc- tober-December edition (Vol. 4, No. 4) of Semicorv

ductorNews -- a quarterly publication of the Pakistan Society for Semiconductor Science and Technology, edited by M. Zafar Iqbal (E-mail: s emcon%phy- sics @ sdnpk .undp .o rg ) . The issue has other inter- esting features on: neuron transistor developments in Germany, microstructures, an "all-silicon" micro-STM, integration of porous-/ crystal-silicon SiC and GaN blue emitters.

ART teams with Bekaert on diamond

Advanced Refractory Tech- nologies, Inc. (ART), Buffa- lo, NY, USA, and N. V. Bekaert S. &, Zwevegem, Belgium, have signed an agreement to form a "stra- tegic partnership to devel- op and m a r k e t MT's DYLYN TM thin film coating technology in Europe: the agreement will result in commercialization of the DYLYN coating technology in Europe via customer- s p e c i f i c a p p l i c a t i o n development".

In concert with the part- nership, Bekaert has ac- qu i r ed f rom MT, the worldwide exclusive right to design, manufacture and sell DYLYN TM deposition

equipment to companies which are licensed by MT to use the DYLYN TM tech- nology. The equipment will be constructed by Sin- vaco (Deinze, Belgium), a company in which Bekaert has majority ownership, and will draw upon Sinva- co's strengths in the design and construction of indus- trial vacuum systems.

'°rhis partnership is sig- nif icant in several re- s p e c t s , " s a i d MT ' s President, Keith Blakely. "First it will enable the European market to more readily access this novel coating technology. Sec- ond, it will address the need for a reliable, high quality supplier of vacuum systems for existing and future licensees. And per- haps most importantly it will draw upon our com- panies' strengths in materi- als , p r o c e s s i n g a n d commercialization to ac- celerate broad-based utili- zation of the technology."

Dr. Wilfried Coppens, General Manager of Be- kaert's Corporate Research Center added, '°Fhis strate- gic partnership fits well into Bekaert's strategy to strengthen its core compe- tence of surface treatment

and coating technologies. Most people do not realize that over 85% of Bekaert's products are coated or sur- face treated in some man- ner. The opportunity to be involved with DYLYN TM

complements and expands Bekaert's portfolio of new products and technologies which can be used intern- ally at Bekaert and exter- nally at client companies."

The DYLYN TM technol- ogy, originally invented by Dr. Benjamin F. Do~fiiian, represents a novel family of thin films and structures of matter which offer signifi- cant improvements over many current thin film coating technologies and provide tremendous op-

portunity for precise tailor- ing and customization of coa t ing p r o p e r t i e s to a d d r e s s a p p l i c a t i o n - s p e c i f i c p e r f o r m a n c e requirements.

It is anticipated that DY- LYN TM could ultimately impact just about every industrial sector including automotive , aerospace, chemical, energy, electro- nics, consumer products, and many others. Contact: Mary T. Spohn, ART, tel~fax: [1] 716875- 4091 / -0106. W. Coppen- sattel, Bekaert, tel~fax: [32] 56- 76- 7129/7100. D. Neerinck at tel: + 32/ 5G 76. 71.87; fax: + 32/ 5G 76. 71 00.

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