Patent ID: 9130078
Filing Date: 2015-09-08
Classification: H01L,Y02E

Abstract:
1. A solar cell comprising: a substrate formed of an n-type crystalline semiconductor; an emitter region of a p-type positioned at a first surface of the substrate; an anti-reflection layer positioned on the first surface of the substrate; a passivation layer positioned on a second surface which is opposite of the first surface of the substrate; a first electrode which is positioned on the first surface of the substrate and is connected to the emitter region; and a second electrode which is positioned on the second surface of the substrate and is connected to the substrate, wherein the anti-reflection layer includes a first anti-reflection layer formed of aluminum oxide, a second anti-reflection layer which is positioned directly on the first anti-reflection layer and is formed of hydrogenated silicon nitride, and a third anti-reflection layer which is positioned directly on the second anti-reflection layer and is formed of hydrogenated silicon oxide, wherein the passivation layer includes a first passivation layer formed of hydrogenated silicon nitride, a second passivation layer which is positioned directly on the first passivation layer and is foamed of hydrogenated silicon oxide, and a third passivation layer which is positioned directly on the second passivation layer and is formed of aluminum oxide, wherein the emitter region has a first textured surface including a plurality of first protrusions each having a protruding height and a maximum diameter which are within a range of about 5 μm to 10 μm, and wherein each of the plurality of first protrusions has a second textured surface including a plurality of second protrusions each having a protruding height and a maximum diameter which are within a range of about 300 nm to 600 nm.