Spire Corp. reports it has received a patent titled ‘Nanophotovoltaic Devices’ from the United States Patent and Trademark Office. Spire’s discovery includes Nano-PV devices with sizes ranging between 50 nm and 5 µm and a technique for their production. The devices are designed to target particular biological cells and are then triggered selectively by light to produce an electrical charge to destroy the cells or hinder their growth.