In the present invention a new solar photovoltaic module is proposed comprising a solar cell comprising a silicon layer having a first (1 a) surface and a second surface (1a) opposite to said first surface. The solar cell further comprises a passivating layer stack (2) comprising a heterogeneous layer (4) arranged on said first surface and/or on said second surface. The heterogeneous layer (4), having a back surface (3) and a front surface (5), comprises a non-conducting matrix (4b) having a refractive index being lower than 3.0. The heterogeneous layer further comprises inclusions 4a of at least one conductive material in said matrix 4b, and at least some of said inclusions (4a) extend from said back surface (3) to said front surface (5) of the heterogeneous layer (4) for electrically connecting the surfaces (3,5) of the heterogeneous layer.