NOVELTY - A card (2600) comprises an information module (2630) on the card to provide information to a user; and a flexible photovoltaic module (2625) on the card for converting light into electricity and powering the information module, where the photovoltaic module comprises a heterojunction composite material. The composite material comprises fullerenes (C60), fullerene particles, carbon nanotubes, or conjugated polymer. The information module comprises an audio unit for playing a prerecorded message, and digital communication elements for downloading digital information from external source.    USE - As a card such as greeting card and smart card (claimed).    ADVANTAGE - The card has flexible photovoltaic cells that convert light to electrical energy, which powers the information module. The card is flexible and has a thickness of less than 500 microns. The card is capable of playing an audio or a video (e.g. in Moving Picture Exports Group (MPEG) format) that may be native or downloaded from a computer or other electronic unit. Upon exposure to light, the smart card including global positioning system shows navigational maps and/or the global position of the user via the display unit.    DETAILED DESCRIPTION - A card (e.g. greeting card) (2600) comprises an information module (2630) on the card for providing information to a user; and a flexible photovoltaic module (2625) on the card for converting light into electricity and for powering the information module, where the photovoltaic module comprises a heterojunction composite material. The heterojunction composite material comprises fullerenes (C60), fullerene particles, carbon nanotubes, or conjugated polymer. The fullerene particles have an average size of 100 - 400 nm. The photovoltaic module further comprises a hole transport material. The information module comprises an audio unit for playing a prerecorded message, digital communication elements for downloading digital information (e.g. audio information e.g. music) from an external source, and/or an interface for providing digital data to a receiver or reader. The information module includes a display element and the digital information includes display information. The display information includes text, graphical images (e.g. color images), photographic information, handwritten characters, or video information.    DESCRIPTION OF DRAWING(S) - The figure shows a photovoltaic-powered multimedia greeting card.    greeting card (2600)    first page (2610)    second page (2620)    photovoltaic module (2625)    information module. (2630)