Patent ID: 8425807

Claim:
A paste-like composition used in an application for forming an aluminum electrode of a solar cell, the composition comprising: an organic vehicle; and an aluminum powder which is dispersed in an organic vehicle, wherein the aluminum powder is a mixture of the following two types of aluminum powders (a) and (b): (a) a small particle diameter aluminum powder, which has a median particle diameter (D 50 ) of particle size distribution based on laser diffraction of 3 μm or less and a ratio of particle diameter at 10% cumulative volume (D 10 ) to particle diameter at 90% cumulative volume (D 90 ) is (D 10 /D 90 ) of 0.2 or more; and (b) a large particle diameter aluminum powder, which has a median particle diameter (D 50 ) of particle size distribution based on laser diffraction that is 2 to 6 times the D 50 of the small particle diameter aluminum powder and a ratio of particle diameter at 10% cumulative volume (D 10 ) to particle diameter at 90% cumulative volume (D 90 ) is (D 10 /D 90 ) of 0.2 or more, and the mixed aluminum powder has a median particle diameter (D 50 ) of particle size distribution based on laser diffraction of 2 μm to 6 μm, and has a ratio of particle diameter at 10% cumulative volume (D 10 ) to particle diameter at 90% cumulative volume (D 90 ) is (D 10 /D 90 ) of less than 0.2.