Patent ID: 7332226

Claim:
A substrate for a photoelectric conversion device, comprising a transparent conductive film, a transparent substrate, and an undercoating film that is provided between the transparent substrate and the transparent conductive film, wherein, with respect to projections present in a surface of the transparent film, the average value of a number distribution of height is larger than its mode, and when the number distribution of height is regarded as following an χ 2 type distribution function in which a horizontal axis is displayed in nanometer units, then the degree of freedom with which it can best be approximated is 3.5 to 15; the average value of a number distribution of the height/width ratio is larger than its mode, and when the number distribution of the height/width ratio is regarded as following an χ 2 type distribution function, then the degree of freedom with which it can best be approximated is 10 to 35; the number of projections having a height of 50 to 350 nm is at least 70%; and the number of projections having a height/width ratio of 0.25 to 1.05 is at least 90%, and the undercoating film comprises: a first undercoating layer whose refractive index is 1.6 to 2.5 and whose film thickness is 5 to 100 nm, and a second undercoating layer whose refractive index is 1.4 to 2.0 and whose film thickness is 5 to 100 nm.