Diffusion kinetics and correlation effects for self-diffusion via vacancy pairs and triple defects in the sphalerite structure

Limits of the ratios of tracer diffusivities for diffusion by vacancy pairs: Application to compound semiconductors

“…We see that the Monte Carlo simulation results agree very well with the matrix method results given above for the zinc blende structure 19 and deviate slightly from those for the NaCl structure. 12,13 On the other hand, the simulation results for the limits deviate quite significantly from those for the CsCl structure ͑11.2 compared with 13.3 given in Ref.…”

“…Two analytical studies have addressed the calculation of tracer correlation factors for diffusion via vacancy pairs in the zinc blende structure. Weiler and colleagues 19 calculated the tracer correlation factors using a modified matrix method. They found that the limits for the ratio of the tracer diffusion coefficients are given by…”

“…The matrix method is normally relatively accurate provided a sufficiently large number of jumps are counted. For the zinc blende structure, where the agreement is good, calculations were done with a maximum of four jumps counted 19 but for the CsCl structure 16 only a maximum of three jumps was counted. The approximate Manning approach, 17 while giving a reasonable estimate of the correlation factors themselves as mentioned above, does not provide an accurate estimate of the ratio of the tracer diffusivities in either the NaCl or CsCl structures, with the latter being quite poor.…”

Ga self-diffusion in isotopically enriched GaAs heterostructures doped with Si and Zn

“…Accurate studies of compound semiconductors also require that the depositedimplanted material maintain the stoichiometry of the bulk material lest concentration gradients be created at the surface. An extreme example of results influenced by these various experimental errors can be found in an investigation of self-diffbsion with ra&oactive Ga and Sb used for radiotracer measurements of self diffusion in GaSb (Weiler and Mehrer 1984). Even with I a careful experimental set up, the results obtained by three different groups vary by nearly six orders of magnitude ( figure 2-3).…”

“…-3. The selfdiffusion coefficients of Ga and Sb in GaSb as determined by different groups using the radiotracer technique(Weiler and Mehrer 1984) …”