Patent ID: 7812381
Filing Date: 2010-10-12
Classification: H01L

Abstract:
1. A CMOS image sensor including a plurality of pixels associated with colors of different wavelengths, each of the pixels comprising: a buried barrier layer disposed in a semiconductor substrate, the buried barrier layer having a barrier potential energy of a conduction band thereof at an equilibrium state; a first layer disposed at a main surface of the semiconductor substrate and separated from the buried barrier layer in a vertical direction which is perpendicular to the main surface of the semiconductor substrate, the first layer having a first potential energy of a conduction band thereof at the equilibrium state; and a second layer disposed between the first layer and the buried barrier layer, the second layer having a second potential energy of a conduction band thereof at the equilibrium state, wherein the second potential energy is higher than the first potential energy and the barrier potential energy, and wherein each of the first and second layers has a thickness in the vertical direction, and the thickness of the second layer is thicker as the wavelength is longer.