Various embodiments of multi-step snowmaking guns are disclosed. High selectivity in applying the stress memorization approach may be accomplished by substantially maintaining the crystalline state of the P-channel transistors while annealing the N-channel transistors in the presence of an appropriate material layer which may not to be patterned prior to the anneal process, thereby avoiding additional lithography and masking steps. The driver circuits respectively generate driving currents, and then the driving currents are collected to drive the high power laser-emitting device or other high power devices. If there are several impurities with a tendency to precipitate, some of the impurities can be kept in solution by adding a suitable solvent and the remainder can be separated by mechanical means, e.