Printed semiconductors are fabricated by depositing materials directly onto a substrate, typically using a combination of printing processes that include inkjet and gravure printing. This has the potential to open new markets in which semiconductors are printed directly onto various surfaces. Diodes are the initial focus of the technology, and they will be followed by more complex transistor functions. RFID tags and sensors form a key market for printed semiconductors. Some electronic paper technology uses a variant of printed semiconductors.