Patent ID: 9640687
Date: 2017-05-02
CPC Classifications: H01L,Y02E,Y02P

Claim:
1. A method for producing a P-N junction in a thin film photovoltaic cell comprising a deposition step in which are successively carried out: a layer of precursors of a photovoltaic material of type P or N, a barrier layer, and a layer of precursors of a semiconducting material of type N or P, this deposition step being followed by a single annealing step carried out with a supply of S or Se or both S and Se, this annealing step leading to the formation of an absorbing layer of type P or N and of a buffer layer of type N or P and of a P-N junction at the interface between said absorbing and buffer layers, said annealing step allowing transformation of said precursors of a semiconductor material of type N or P into a material forming said buffer layer, the barrier layer preventing chemical diffusion and oxidation at the interface between the absorbing layer and the buffer layer during this annealing step.