The paper presents a solution for improving the quality of the surface generated during deep wet etching of glass using an HF (49%)/HCl (37%) solution in a volumetric ratio 10:1. Pyrex glass (Corning 7740) and soda lime glass were analyzed. In addition, the characterization of the main masking layers, including photoresist, amorphous silicon, polysilicon and Cr/Au for deep wet etching in the optimal solution, is described.
We present a method to separate bulk lifetime and surface recombination velocity using transient photoluminescence (PL). With the use of the analytical expression of transient PL, the asymptotic separation of two transient PL decays excited by different wavelengths can be obtained. Combined with the use Nike Roshe Run Woven of the intensity ratio of two steady-state PL intensities excited by the two different wavelengths, the lifetime separation can be achieved. In addition, detailed methods to experimentally determine the two terms are presented.
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of extending Grötzsch’s Theorem, we prove that every triangle-free graph without a K5K5-minor is 3-colorable. It has been recently proved that every triangle-free planar graph admits a homomorphism to the Clebsch graph. We also extend this result to the class of triangle-free graphs without a K5K5-minor. This is related to some conjectures which generalize the Four-Color Theorem. While we show that our results cannot be extended directly, we conjecture that every K6K6-minor-free graph of girth at least 5 is 3-colorable.