Formation and morphology of closed and porous films grown from grains seeded on substrates: Two-dimensional simulations

Early stages of polycrystalline diamond deposition: laser reflectance at substrates with growing nanodiamonds

“…(2) Coalesced particles may be larger than the wavelength for which the Rayleigh scattering approximation holds, leading to signicant discrepancies between the model and the experimental data. Once all diamond particles coalesce to form a continuous layer of polycrystalline diamond, which we called the closed-lm threshold in our previous work, 34 the reectance signal can be described using the transfer matrix method. 45 By visual inspection, it is also evident that the tting curves coincide with experimental data up to a reectance value of 0.7 ± 0.1, which we interpret as the empirical reectance limit above which our model can be applied with condence.…”

“…For example, Mandal et al 32 found that a low seed density reduces stress in a PCD film grown on an aluminum nitride substrate, affording the deposition of a thicker film without delamination. Tsigkourakos et al 33 found that lowering the seed density increases the electrical conductance of boron-doped films by one order of magnitude, and Janssens et al 34 showed, through simulations, that the seed density strongly affects the grain size distribution. These results show that the seed density is a useful parameter for tuning the properties of PCD films and is therefore explored systematically in this work.…”

Percolation connectivity in deposits obtained usingcompetitive random sequential adsorption of binarydisk mixtures

“…The morphology and continuous percolation in porous films simulated by using the RSA deposition of disks on 2D substrate was also recently discussed [77]. The 2D percolation and cluster structure of the compact random packing of binary disks were studied [78].…”

Etching Kinetics of Nanodiamond Seeds in the Early Stages of CVD Diamond Growth

“…However, in most CVD methods, the nucleation density of diamond islands on nondiamond surfaces is usually very low, typically in the range 10 4 –10 6 nuclei/cm 2 . , This implies that only rather thick (10–100 μm) closed (i.e., pinhole-free) films can be formed by impingement of the growing nuclei/islands. To get ultrathin (≤100 nm) and continuous NCD layers, nucleation densities exceeding 10 11 cm –2 (10 3 μm –2 ) are mandatory. − Therefore, several nucleation enhancement methods, including abrading with diamond grit and negative biasing of the substrate surface, have been developed to increase the nucleation densities. , Another way to get ultrathin films is the seeding technique, i.e., the application of tiny diamond particles at the substrate surface, which act as growing centers in the subsequent CVD process . The market availability of detonation nanodiamond (DND) suspensions enables the application of a large number of diamond nanoparticles per unit area, with good spatial homogeneity and size distribution.…”