To protect your phone, never put it for a long time to the direct sunlight, because the high temperatures can damage it.
Featurerequests and bugreports are handled with high priority, just send an email, I will answer as soon as possible. You can write me in German and English…
Of course, the screen of your Android smartphones can not use as solar panel. Solar Chager Free is just a fun-app, note more! With this app you can prank your friends. To make the illusion complete, the application uses the brightness sensors of the device. Note this in your rating, because it is technically not possible to use the display as solar in order to generate electricity and charge your battery.