Patent ID: 8105866
Filing Date: 2012-01-31
Classification: H01L

Abstract:
1. A manufacturing method of a semiconductor photo detecting element comprising: forming a first semiconductor layer, a second semiconductor layer, a third semiconductor layer and a fourth semiconductor layer on a semiconductor substrate in order, the first semiconductor layer being lattice-matched to the semiconductor substrate, including a first conductivity type dopant, and having first band gap energy, the second semiconductor layer having the first band gap energy, and having a concentration of the first conductivity type dopant lower than that of the first semiconductor layer or being substantially undoped, the third semiconductor layer including a second conductivity type dopant different from the first conductivity type dopant and having the first band gap energy, the fourth semiconductor layer having second band gap energy larger than the first band gap energy and being composed of InP; selectively etching the fourth semiconductor layer so that a window pattern is formed in the fourth semiconductor layer and at least a part of an upper face of the third semiconductor layer is exposed; exposing a side face of the first through the third semiconductor layers with an etching treatment; masking an upper face of the fourth semiconductor layer and the exposed upper face of the third semiconductor layer; and forming a fifth semiconductor layer having the second band gap energy on the side face of the first through the third semiconductor layers, and being composed of InP, a thickness of the fifth semiconductor layer being thicker than the thickness of the fourth semiconductor layer.