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## Historic development of CdTe   CdTe solar cells have come quite a long way in 40 years with their efficiency nearly tripling since 1976 when Matsushita created a ceramic thin film CdTe solar cell by the screen printing method\cite{Nakayama_1976}. Over the following decade, Kodak pushed CdTe solar cell efficiency by several percent once they began using close space sublimation deposition\cite{2003}.   During the late 90’s efforts to improve cell efficiency were primarily concerned with increasing JSC. Research done at the University of Southern Florida helped pushed the efficiency of these solar cells even further using metal organic chemical vapor deposition (MOCVD) among other techniques\cite{Liu_1993}. techniques \cite{Liu_1993}.  With research from NREL and Matsushita, solar cells improved further until eventually First Solar became the global leader in the development of these cells at the turn of the century, improving the efficiency to where it stands today.