Now that we're finally getting those jetpacks futurists have promised, it's time to update our first-world wish list to include solar-powered smartphones.The good news is that smart people are working on it -- including Apple. The company recently posted a job listing for an engineer with experience with solar power.Apple's job opening could be unrelated to any project that even explores solar power -- the expertise required could be applied to other thin-film technologies. But it's clear that Apple is interested in -- and working on -- solar smartphone technology.In February, Apple filed a patent for a method of integrating solar panels into a mobile touchscreen. The company has older patents for solar gadgets as well.Now, patents don't always equal intent. But the patents and job listing have rumor mongers speculating about a solar-powered iPhone 6.Forget