Photovoltaics: Reviewing the European Feed-in-Tariffs and Changing PV Efficiencies and Costs

Figure 5

PV efficiency versus year of development [examples of developers]. Three-junction cells (concentrator) [NREL, Boeing, Solar Junction], three-junction cells (nonconcentrator) [NREL, Sharp], two-junction cells (concentrator) [NREL, Spectrolab, Sharp], single-junction GaAs single crystal [IBM, Varian, Alta Devices], single-junction GaAs single concentrator [FhG-ISE, Varian], crystalline Si cells single crystal [Westinghouse, UNSW, NREL], crystalline Si cells multicrystalline [Solarex, Eurosolar, UNSW], crystalline Si cells silicon heterostructures (HIT) [Sanyo], thin-film Cu (In, Ga) Se [NREL, ZSW], thin-film CdTe [United Solar, NREL, AstroPower], thin-film amorphous Si:H (stabilized) [United Solar, Mitsubishi Chemicals], and emerging PV dye sensitized cells [EPFL, Sharp, NIMS].