| 摘要 |
PURPOSE:To widen a responding wavelength range and to improve the photoelectric conversion efficiency by forming a PPN junction of a P type organic material layer and an N type material layer. CONSTITUTION:The first P type organic material layer 10, the second P type organic material layer 11, and an N type material layer 12 are sequentially formed on the first light transmission conductive material layer 9, the second conductive material 13 to become an electrode is coated thereon, thereby forming a PPN type photoelectric converter. In this case, the combinations of satisfying the conditions that the material base absorption end as the first P type organic material is disposed at the high energy side from the second P type organic material and that the basic absorption end of the material of the second P type organic material is disposed at the higher energy side from the N type material are selected. The electric conductivity of the second P type organic material is desired to be smaller than the first P type organic material. According to this structure, the light absorbed by the first and second P type organic materials produces electron and hole pairs to generate a photocurrent, but since the light of wavelength shorter than the homogeneous junction can be utilized, the photocurrent is increased. In other words, wire band width characteristic can be performed. |
