BOUNDARY

The boundary command allows sections of the structure surface to be redefined. This is convenient for creating device contacts.

• NAME=(s)
• [XMIN=(r)]
• [XMAX=(r)]
• [YMIN=(r)]
• [YMAX=(r)]
• [ZMIN=(r)]
• [ZMAX=(r)]

The following list itemizes the valid keywords, their units and their meaning.

NAME: [string]

is the name for the new section of the boundary.

XMIN: [real (microns)]
XMAX: [real (microns)]
YMIN: [real (microns)]
YMAX: [real (microns)]
ZMIN: [real (microns)]
ZMAX: [real (microns)]

parts of the surface lying between XMIN:XMAX, YMIN:YMAX, ZMIN:ZMAX are converted to the requested name. Any omitted bounds default to the device limits. If all bounds are omitted, the entire surface is converted.

RENAME [logical]

to change the name of a boundary (e.g., may be useful when reading in a structure from a .TIF or .PAS files). This keyword requires specifying the old and new names with the ``old'' and ``new'' keywords.

OLD [string]

name for boundary (used with the ``rename'' keyword).

NEW [string]

name for boundary (used with the ``rename'' keyword).

WORKFUNC [real (eV)]

of the workfunction of the metal at this contact.

CONTACT [logical]

this boundary as an electrical contact (default = true).

INTERNAL [logical]

keyword allows the boundary to be placed on an internal interface (default = false).

MATERIAL [string]

condition will be applied only on surfaces or interfaces which include the specified material type.

MATERIAL1 [string]

condition will be restricted to interfaces of type MATERIAL1 and MATERIAL2. Both keywords must be specified.

MATERIAL2 [string]

condition will be restricted to interfaces of type MATERIAL1 and MATERIAL2. Both keywords must be specified.

Examples:
boundary xmin=0 xmax=0 name=anode contact
boundary xmin=1 xmax=1 name=cathode contact
boundary xmin=-0.21 xmax=-0.19 material=poly name=gate contact

Less Used BOUNDARY Keywords

R [real]

element parameter.

L [real]

element parameter.

C [real]

element parameter.

DEBUG [logical]

some debugging information.