A variety of adsorption studies are being carried out globally. I want to know, if any molecule is adsorbed over the surface of any substrate will built-in electric field generation take place at the junction? The question needs to be divided further into two parts (i) when the molecule is adsorbed and it does not form any chemical bond with the substrate there is a charge difference at the interface and there should be the generation of a built-in electric field (ii) if there is any type of chemical bonding still the polarity difference is intact, shouldn't electric field be there ?

Please attach any literature that supports your answers.

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