Sharp predicts that miniature solar cells will be used to significantly extend the operating life of mobile phones and other portable systems between battery charging cycles.
"For sensors or remote controls that are independent of the mains power supply it may even be possible to provide as much as 100% of the power requirement from a solar cell," said the solar panel supplier.
Sharp plans to expand its family of LROGC02 type solar components for mobile applications to five models to address this market.
These have an efficiency of 13% and the low mounting depth of 0.8mm.
The company has a longer term plan to redesign the solar panel components, relocating the wiring to the underside of the panel will give next-generation models an even, continuous surface.
"This will increase efficiency to as much as 20% as the cells will no longer be shaded by the wires. But the device's design will also benefit if the exterior is no longer criss-crossed by visible conductors," said Sharp.
To handle the mechanical stresses likely to be experienced in mobile handsets, the solar cells are double wired to ensure panel performance is fully maintained even in the event of a cell breakage.
By varying the number and configuration of the individual polycrystalline solar cells the panels provide different power outputs and voltages. The range extends from single cell types with a 30mW power output at a voltage of 0.5V to models with 10 cells and a power output of 300mW at 5V.
SHAILENDRA EKKA
PGDM-A-III
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