NOVELTY - A semiconductor nanocrystal-metal complex (C1) comprises: a semiconductor nanocrystal, and at least one metal particle bound to the nanocrystal.    USE - For preparing a device (claimed), such as for manufacturing variety of devices e.g. solar cells, optical sensors, etc.; which are useful in formation of arrays for bioassays.    ADVANTAGE - The semiconductor nanocrystal-metal complex exhibits excellent photocurrent characteristics and an improved binding force and reactivity, in addition to the characteristics of semiconductor nanocrystals. Thus broadens the applicability of the semiconductor nanocrystal; as compared to the prior art semiconductor nanocrystals, and allows their utilization in various analytical applications, such as bioassays, without the need of linking several linking materials to the surface of semiconductor nanocrystals, by a complicated process that results in poor reactivity of the semiconductor nanocrystals. The metal particles can be bound to the semiconductor nanocrystal at various positions without restriction, such as edges or ends of the semiconductor nanocrystal, as continuous layer surrounding the semiconductor nanocrystal, or as a core-shell structure. The semiconductor nanocrystal-metal complex exhibits both characteristics of the semiconductor nanostructure and characteristics of the metal nanostructure; and permits transition of electrons excited to quantized energy levels to the metal nanostructure, which causes a resonance phenomenon to occur. Thus exhibits new characteristics other than characteristics of the semiconductor nanostructure and the metal nanostructure. The luminescent properties of the semiconductor nanocrystal-metal complex can disappear or weakened, unlike those of current semiconductor nanocrystals, as determined by photoluminescence spectroscopy. The metal particles bound to the semiconductor nanocrystal can easily form strong covalent bonds with organic materials having a functional group, which enables their application in arrays, such as for bioassays. The semiconductor nanocrystal-metal complex can be further prepared at room temperature without involving complicated steps or using additional apparatus.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparing a semiconductor nanocrystal-metal complex involving: preparing a semiconductor nanocrystal; mixing the semiconductor nanocrystal with a metal precursor; and reducing the metal precursor into metal particles to bind the metal particles to the semiconductor nanocrystal.