Method for producing a photovoltaic device

A process for preparing a photovoltaic device including at least one film of at least one semiconductive metal oxide with a major amount of a nanosized photocatalytic crystalline phase, comprising the steps of:

• a) obtaining the at least one semiconductive metal oxide with a major amount of a photocatalytic crystalline phase;
• b) forming a suspension of the at least one semiconductive metal oxide with a major amount of a photocatalytic crystalline phase in an aqueous solution containing at least a hydrosoluble organic polymer and a hydrolysable organic derivative of metal of the metal oxide;
• c) depositing the resulting suspension on a substrate to give a film;
• and
• d) treating said film at a temperature between about 30° C. and about 100° C. in the presence of water.

A process for preparing a film comprising at least one semiconductive metal oxide with a major amount of a nanosized photocatalytic crystalline phase, comprising the steps of:

• a) obtaining the at least one semiconductive metal oxide with a major amount of a photocatalytic crystalline phase;
• b) forming a suspension of the at least one semiconductive metal oxide with at least one semiconductive metal oxide in an aqueous solution containing at least a hydrosoluble organic polymer and a hydrolysable organic derivative of said metal oxide;
• c) depositing the resulting suspension on a substrate to give a film;
• and
• d) treating said film at a temperature between about 30° C. and about 100° C. in the presence of water.