Printability conditions for an all-solid-state laser transfer

Low‐Energy UV Ultrafast Laser Controlled Lift‐Off for High‐Quality Flexible GaN‐Based Device

“…Compared with the cross‐section view of the irradiated area formed at 0.13 J cm −2 (Figure 1d), it could be visually observed that with the increase of plasma density, the slit formed at low laser fluence transforms into a cavity with a certain gap, which is not only due to the greater decomposition of the GaN layer but also attributed to the internal pressure by the plasma. The GaN film in this cavity region could be treated as a clamped plate, and according to the Kirchhoff‐Love plate theory, [ 36 ] the maximum value of the tensile stress of the clamped plate is inferred to be concentrated at the edge. It is consistent with the phenomenon observed in Figure 1d.…”

“…Although the residual stress in the GaN film is at a minimum after separation, the maximum stress still exists at the cavity edges during laser scanning to form interconnected cavities. [ 36 ] Depending on the above results, large‐area surface patterning on flexible substrates is realized, as shown in Figure 6e,f. Here, the diameter of this patterned GaN film is 3 cm.…”

Parametrization and simulation of blister-actuated laser-induced forward transfer (BA-LIFT) and LIFT for high-viscosity pastes

“…To guarantee that the pellet formed when the cracks reach the surface of the donor fits in size and shape the laser beam, sometimes the donor is pre-machined before the transference (Kaur et al, 2011). The complexity of the process relies on the small window of values for the parameters of the process that breaks the donor without melting, only by bending and rupturing without a significant amount of material ablated (Surdo, Diaspro and Duocastella, 2020), or vaporizing a small amount of material but enough to guarantee the ejection of a solid pellet (Bera et al, 2007). A configuration without a gap, in which both substrates are pressed together, has been designed to transfer SiOX layers (Ihlemann and Weichenhain-Schriever, 2014).…”

“…There are different LIFT variants reported in many works and authors, according to the specific configuration for certain applications. However, some of them are out of the "LIFT" acronym and have been named Laser Pressure Catapulting (Scheidl et al, 2002;Surdo, Diaspro and Duocastella, 2020), Biological Laser Printing (BioLP™) (Barron, Wu et al, 2004;; Chen, C. Y., Othon et al, 2008), or even Direct Laser Printing (DLP) (Boutopoulos et al, 2008;Chatzipetrou et al, 2011;Papazoglou, S. et al, 2016). There are even less frequently used names, such as Backside Laser Irradiation, or Laser-assisted Bioprinting (LaBP).…”