Difference in the Dynamic Scaling Behavior of Droplet Size Distribution for Coalescence under Pulsed and Continuous Vapor Delivery

Abstract

Dynamic scaling behavior of the droplet size distribution in the coalescence regime for growth by pulsed laser deposition is studied experimentally and by computer simulation, and the same is compared with that for continuous vapor deposition. The scaling exponent for pulsed deposition is found to be (1.2 +/- 0.1), which is significantly lower as compared to that for continuous deposition (1.6 +/- 0.1). Simulations reveal that this dramatic difference can be traced to the large fraction of multiple droplet coalescence under pulsed vapor delivery. A possible role of the differing diffusion fields in the two cases is also suggested.

Unusual Scaling for Pulsed Laser Deposition

“…Equation (15) agrees with the power-law scaling of the maximum island density discussed by Jensen and Niemeyer [16], who give a slightly smaller exponent 1͞4. This discrepancy can be explained by the fact that our islands are fractal.…”

“…This equation describes the crossover from MBE-like behavior, n~͑D͞F͒ 22g , for I ø I c , to PLD-like behavior (15) for I ¿ I c . As in the PLD regime, the island density does not depend on D͞F [16]; I 2n c must compensate the factor ͑D͞F͒ 22g .…”

“…Different theories are appropriate for various physical conditions. For example, in [15] the island statistics is studied for tin droplets deposited by PLD on a sapphire substrate, and power-law scaling is found. By contrast, our theory should apply for systems with twodimensional islands and deposition at low energies.…”

Microstructural evolution of oxides and semiconductor thin films

“…For example, in Ref. [146] the island statistics is studied for tin droplets deposited by PLD on a sapphire substrate, and power-law scaling is found. By contrast, our experiments and simulations should apply for systems with low-dimensional islands.…”

Embedded polytypes inBi2Sr2−xLaxCuO6Cancellieri1, Lin2, Ariosa3 et al. 2007Phys. Rev. B5240View full textAdd to dashboardCite

“…Furthermore, PLD is an out-of-equilibrium process, which can favor the irreversible formation of otherwise metastable secondary phases. 1,2 In the particular context of our work, i.e., the growth of Bi 2 Sr 2 Ca n−1 Cu n O 2n+4 ͑n =1,2,3͒ ͑BSCCO͒ systems, a large number of different polytypes with close formation enthalpy can occur. Earlier work on BSCCO grown by sputtering [3][4][5] shows the presence of intergrowth ͑intercalated and oriented similar structures͒ embedded in the majority-phase matrix.…”