In our latest newsletter on Photovoltaics (PV) we focused on thin film PV (TFPV), which has grown rapidly with First Solar taking commercial leadership in the PV industry with its low cost CdTe modules. Other companies like Oerlikon, Applied Materials, and others are also making great progress in developing and commercializing other TFPV technologies. In this newsletter we look at some interesting materials technology related developments in conventional Si PV as well as TFPV. However, we also cover interesting developments in Concentrating PV (CPV) that adds its own set of technological and materials related challenges for commercialization. The technology is not new with a long history of R&D and space applications, but is finally getting commercial traction in recent years.