Photovoltaic cell assembly with ultraviolet filtering

A photovoltaic device comprising:

• a plurality of photovoltaic cells coupled in series, the photovoltaic cells comprising:
• a first contact layer disposed over a first substrate;
• a first charge transport layer (CTL) disposed over the first contact layer;
• an absorber layer disposed over the first CTL;
• a second CTL disposed over the absorber layer;
• and
• an ultraviolet (UV) blocking layer disposed between the first substrate and the first contact layer, wherein
• the UV blocking layer comprises a first layer formed on a first side of the first substrate and a second layer formed over the first layer,
• a first refractive index difference between the first layer and the first substrate is less than or equal to 1.3, and
• a second refractive index difference between the second layer and the first layer is from about 0.75 and about 1.5.