Apple is looking to hire engineers with a knowledge of thin film solar technology, in a move further indicative of the possibility that our future iDevices could be powered by the sun.

Though rumors of solar powered iDevices have been circulating online for some time, Apple’s new job listing adds a fair amount of weight to such speculation. The listing, which has appeared on Apple’s website and reached us from 9to5Mac, is looking for thin film engineers to join Apple’s Mobile Devices group, and to “assist in the development and refinement of thin films technologies applicable to electronic systems.”

Apple explains:

The Mobile Devices group is seeking an experienced professional who brings expertise in the area of thin films deposition. This engineer will assist in the development and refinement of thin films technologies applicable to electronic systems. The successful engineer in this role will be able to work closely with suppliers and deliver scalable manufacturing processes in a timely manner.

As a reminder, Apple is indeed interested in developing solar technology, and is said to be incorporating the technology within its futuristic Campus 2 headquarters. Though it’s already possible to charge iDevices using solar powered cases, in 2011 we heard that Apple was particularly interested in situating solar cells beneath an iDevice’s screen, and the company even secured a patent related to this.

In addition, 9to5Mac also speculates that such technology could relate to Apple’s anticipated “iWatch,” which will require lengthy battery life but may be too thin to house a large battery.

You can read through the entire job advertisement online, at Apple’s website. We’ll keep you updated with further information as we receive it.

In the meantime, see: Mail Pilot Adds Support For New Message Notifications, But Still No Push?Apple Offering iPhone 5s, iPhone 5c Reservations From Sept. 17 In China, and Acclaimed Calculator App PCalc Adds Full iOS 7 Support With New 3.0 Update.