A Cu\u2014Ni\u2014Sn\u2014P alloy is provided, which is excellent in stress relaxation property in a direction perpendicular to a rolling direction, and has any of high strength, high conductivity, and excellent bendability. Representative biomolecules include antibodies and nanobodies ), antibody fragments, and peptides that may have an affinity for particular types of cells, such as cancer cells. Furthermore, in embodiments utilizing a photosensitive element for high conversion gains, the value of high conversion gain for the respective photosensitive element maybe increased due to the separation between floating diffusion nodes, enabling high sensitivity for low-light conditions.