Thanks for your help!
Please say a specific element from the Periodic Table of the Elements. 
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{ 2 comments… read them below or add one }
The cheapest is an electric meter that reverses when you are producing power, if you are already on the grid.
Otherwise, batteries are about the only real alternative for home scale systems.
There is nothing in the periodic table of elements that is a good choice for storing solar energy. For that matter, solar cells produce electrons, which can only be stored in a rechargeable battery of some kind or a capacitor of some kind. Alternating currents cannot be stored at all. A capacitor capable of storing enough electrons to be commercially useful for grid power would be extremely large and extremely dangerous. Even the best of rechargeable batteries today have limited energy densities, too small for commercial grid power. Photoelectric elements lie along the semi-metal line in the periodic table – arsenic, silicon, gallium, etc.
Silicon dioxide and gallium arsenide are the present industry leading materials in photoelectric devices. The molecular key is that the bond energies of electrons in these substances are equal, approximately, to the energy levels of certain photons, so capturing such a photon knocks loose an electron, which can be collected with others into an electric current. Better capture rates require a mixture of materials such that photons of any wavelength can be captured and used to liberate electrons.