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3. **Efficient Light Trapping Structure** via Distributed Bragg Reflectors as a back mirror and textured glass to increase photon recycling.\cite{Khosroabadi_2014}  ## Buffer Layer  By incorporating a very thin resistive high-resistive  buffer layer, the CdS layer thickness can be reduced to below 50nm, which reflects positively on enhancing  the blue response, response (<510 nm) of the CdTe cell,  CdS film morphology and conversion efficiency of the CdTe device. This buffer layer is normally made with ZnO, transparent conductive oxide, effectively joining the TCO in function as the front contact. simply by utilizing thinner CdS window layers in order to  , which lead to the development of  “buffers” (or high resistivity transparent films)  ## Back Contact  Degradation effects are often associated with metal diffusion from the back contact of the cell, which is Cu in most cases. However, cells with stable back contact can also exhibit instability, as also all the other cell layers are potential sources of impurities causing instability.\cite{B_tzner_2004}