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Benjamin Sanchez Lengeling edited Background_CdTe_photovoltaics_PV_is__.md
about 9 years ago
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# Background
CdTe photovoltaics (PV) is the only thin film technology with lower costs than conventional solar cells made of crystalline silicon in multi-kilowatt systems. In August of 2014, First SolarĀ® was able to accomplish a CdTe solar cell efficiency of nearly 21%. The theoretical upper bound of efficiency, the Shockley-Queisser (SQ) limit for a PV with a band gap of 1.5 eV (CdTe) is 30%.
This paper discusses the optical and electrical factors that reduce the efficiency of a single junction CdTe PV below the SQ limit and provides recommendations on closing this 9.0% gap. We use the index \(\zeta_{SQ} = \frac{\zeta_{real}}{SQ_{limit}}\) , which is the ratio between the real and ideal efficiency as a measure of this gap, in this case the First Solar CdTe PVs have a value of \(\zeta_{SQ}=0.7\). This number is relevant since other high efficency PV such as GaAs have a
values value of \(\zeta_{SQ}=\frac{28.2}{33.5}=0.84
\) \), which indicates it is much closer to the SQ limit.