A solid-state image pickup device includes a semiconductor substrate and at least a layer of photosensitive semiconductor having a semiconductor material in which photocarriers are excited with a light incident thereto. The photosensitive semiconductor layer is disposed above one principal surface of...http://www.google.com/patents/US4737833?utm_source=gb-gplus-sharePatent US4737833 - Solid-state color image pickup device with accumulated-layer structure
