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Need help in selection of solar cells of approriate power to build miniature car !!!!!!!!!!!!!!!!!!!!!!

I need to build an entirely solar powered engine within dimensions of 10cm*10cm*20cm which can carry load of about 100 g on a bogey attatched with the engine. Can somebody provide useful links to solar cells which can provide sufficient power to accomplish this ? Also, are there other methods of maximising power in this small design ?