What specific steps should be used to clean the wafer? A little more detail
LED epitaxial wafer process:Over the past decade, in order to develop high brightness blue light-emitting diode, all over the world, the relevant research personnel are fully invested. The commercialization of products such as blue and green light-emitting diode two LED and laser diode LD application of the - III - V elements of the potential. In the current commercial LED materials and technology extension, red and green light emitting diodes are mainly epitaxy growth method of liquid phase epitaxy, and yellow, orange light emitting diode is still in vapor phase epitaxial growth method to grow P GaAs GaAsP materials.In general, the growth of GaN requires a very high temperature to interrupt the NH3 of the N-H solution, on the other hand, the kinetic simulation also learned that NH3 and MO Gas will react to produce no volatile by-products.
. Because of the advantages of easy control, low voltage DC drive, rich color after combination, long service life and so on, it is widely used in various engineering, large screen display system. LED can be used as a display, under the control of the computer, display color changes in the video and pictures. LED is a semiconductor capable of converting electrical energy into visible light
But when these two semiconductors are connected, they form a "P-N junction". When the current through the wire to the chip, the electron will be pushed to the P area, in the P area of the electron and hole compound, and then will be in the form of photon energy, which is the principle of LED luminescence. The wavelength of light is the color of light, which is determined by the material that forms the P-N junction. The utility model is a display screen which is used for displaying various information such as text, graphics, image, animation, quotation, video, video signal, etc. by controlling the display mode of the semiconductor light emitting diode.
LED (Light Emitting Diode), light emitting diode, referred to as LED, is a kind of power can be converted into visible light solid-state semiconductor devices, which can directly convert electricity into light. The heart of LED is a semiconductor chip, one end of which is attached to a support, one end is a negative electrode, and the other end is connected with the positive electrode of the power supply so that the whole chip is encapsulated by epoxy resin. The semiconductor chip is made up of two parts, one part is the P type semiconductor, in which the hole is dominant, the other end is the N type semiconductor.
