Research in organic photovoltaics (OPVs) escalated when it was proposed as one of the low cost alternatives to the silicon-based PV technology. For about three decades, progress in the field has brought to the forefront some specific features of organic cells, which are very interesting when considering them for applications where the silicon technology is less applicable. During those years, material science research has successfully pushed the band gap of PV polymers from the near UV or visible toward the near-infrared region (NIR). Today, one may find several PV polymers, known in the field as “low band gap polymers,” where the band gap is centered close to where the sun photon flux is maximum.1–35 When combined with certain derivatives of the fullerene molecule, single junction cells with power conversion efficiencies approaching 10% can be fabricated.36–40 Amazingly, in the majority of such high performance single junction devices, the absorber layer, consisting of a bulk hetero-junction (BHJ) of the above-mentioned polymers and fullerene derivatives, is typically not more than 100 nm thick. Visible light is partially transmitted through such thin absorber layers, making it possible to clearly see objects which appear unaltered in shape or color to the viewer. The potential for the integration of such a technology on transparent vertical surfaces, which dominate the landscape of any major city, is tremendous. Devices fabricated from other thin film PV technologies can be made semi-transparent. But when the solar cell performance is evaluated in terms of the power conversion efficiency (PCE) and the level and quality of the luminosity, corresponding to the integral of the transmission weighted by the product of the human eye photopic spectral response with illumination from the white standard illuminant CIE-D65,41 organic technology offers the most promising solution.