摘要:

The 1:1 adduct of dimethyl zinc with triethylamine is an attractive precursor for the growth, using metal organic vapor phase epitaxy (MOVPE), of zinc based II‐VI compounds due to its high purity and suppression of unwanted pre‐reactions. A key parameter in MOVPE is the vapor pressure of the precursors which needs to be known in order to control the correct concentrations of organometallics entering the reactor. The literature on the vapor pressure of this precursor has been based on static measurements and has been inconsistent with the observed growth rates for ZnTe and ZnSe. An Epison ultrasonic monitor has been used to measure the concentrations under dynamic conditions and predict saturated vapor pressure (log10p=9.80–2596/T) which agree closely with the growth rate measurements but are up to a factor of 10 smaller than the static measurements. The reasons for these discrepancies are discussed. ©1996 American Institute of Physics.

ISSN:0003-6951    

DOI:10.1063/1.115957

出版商:AIP    

年代:1996

数据来源: AIP

摘要:

A nonpolymer material, calixarene derivative (hexaacetatep‐methnylcalix[6]arene) was tested as a high‐resolution negative resist under an electron beam lithography process. It showed under 10‐mm resolution with little side roughness and high durability to halide plasma etching. A sub‐10‐nm Ge quantum wire was perfectly etched off without defects. Such a performance is suitable for nanoscale device processes. ©1996 American Institute of Physics.

ISSN:0003-6951    

DOI:10.1063/1.115958

出版商:AIP    

年代:1996

数据来源: AIP

摘要:

A strip dipole on a (111)‐oriented face centered cubic photonic crystal is found to have a copolarized directivity and radiative gain of 9.1 and 7.2±1.4, respectively, along the zenith and at a frequency in the first stop band of 18.0 GHz. Under the same conditions, the maximum copolarized directivity and radiative gain were 10.0 and 8.1±1.6, respectively, in theH‐plane 5° down from the zenith. The zenithal results correspond to a 5.5‐times greater radiation intensity than displayed by the same dipole in free space. From power balance measurements, only 10% of this enhancement is attributed to superior power transfer between the generator and antenna. The remainder is associated with constructive interference between the primary antenna radiation and radiation reflected from the crystal. ©1996 American Institute of Physics.

ISSN:0003-6951    

DOI:10.1063/1.115959

出版商:AIP    

年代:1996

数据来源: AIP

ISSN:0003-6951    

DOI:10.1063/1.116798

出版商:AIP    

年代:1996

数据来源: AIP