Chemistry of K in Cu(In,Ga)Se^sub 2^ photovoltaic absorbers: Effects of temperature on Cu-K-In-Se films

Incorporation of K has led to world record Cu(In,Ga)Se2 photovoltaic power conversion efficiencies, but there is poor consensus about the role of phase impurities in these advances. This work lays a foundation for identifying and controlling these phase impurities. Films of Cu-K-In-Se were co-evapor...

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