Method for treating a photovoltaic module by light soaking

A method for treating a photovoltaic module comprising a plurality of photovoltaic cells coated with an encapsulating material and disposed between two protective plates, said method successively comprising:

• a first step of exposing at least one photovoltaic cell of the photovoltaic module to electromagnetic radiation, during which the temperature of said at least one photovoltaic cell increases until it reaches a temperature referred to as the efficiency enhancement temperature, greater than or equal to 100° C.;
• a second step of exposing said at least one photovoltaic cell to electromagnetic radiation, during which the temperature of said at least one photovoltaic cell is maintained between Ts−5° C. and Ts+5° C. where Ts is the efficiency enhancement temperature, the second exposure step having a duration greater than or equal to 5 s;
• and
• a step of cooling said at least one photovoltaic cell until it reaches a temperature below 100° C.;
• wherein the electromagnetic radiation has a first irradiance during the first exposure step and a second irradiance during the second exposure step, the second irradiance being lower than the first irradiance, and wherein the second irradiance is decreased in the second exposure step.