Tandem organic-inorganic photovoltaic devices

A tandem photovoltaic cell, comprising:

• a substrate;
• a first electrode formed on said substrate;
• a first sub-cell comprising a first light absorption material and formed on said first electrode;
• an inter-cell layer formed on said first sub-cell;
• a second sub-cell comprising a second light absorption material and formed on said inter-cell layer;
• and
• a second electrode formed on said second sub-cell,
• wherein at least one of said first sub-cell, said second sub-cell, or said inter-cell layer has a surface that is rough on a scale of wavelengths of light that can pass therethrough.

A tandem photovoltaic cell, comprising:

• a substrate;
• a first electrode formed on said substrate;
• a first sub-cell comprising a first light absorption material and formed on said first electrode;
• an inter-cell layer formed on said first sub-cell;
• a second sub-cell comprising a second light absorption material and formed on said inter-cell layer;
• and
• a second electrode formed on said second sub-cell,
• wherein said inter-cell layer provides electrical connection between said first and second sub-cells and is at least partially transparent to light of at least a portion of said spectral range, and
• wherein said inter-cell layer comprises a p-type metal oxide.