What is defined as a semiconductor nanocrystal?

A semiconductor nanocrystal is specifically defined as a tiny particle made from semiconductor materials. These nanocrystals typically have size-dependent electronic and optical properties, which differ significantly from bulk materials. This unique characteristic allows them to be used in various applications such as solar cells, LEDs, and quantum dots, where manipulation of electronic properties at the nanoscale is essential.

In contrast, the other options focus on materials and applications that do not align with the definition of semiconductor nanocrystals. For instance, organic materials and textiles do not fall under semiconductor classification, and polymer blends are not related to the properties that semiconductor nanocrystals exhibit. The specificity of being made from semiconductor materials rather than organic or polymer substances is what makes the correct answer accurate.