deletions | additions       diff --git a/Based_on_previous_research_and__.md b/Based_on_previous_research_and__.md  index 4947d93..3d0791c 100644  --- a/Based_on_previous_research_and__.md  +++ b/Based_on_previous_research_and__.md 
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Based on previous research and looking at the success of other materials, we propose two similar yet different designs illustrated in figure . \ref{fig:strategies}.  Both designs are based on three main ideas:   1. **Buffer Layer** between the window and the front contact for defect passivation/lifetime 
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This strategy is influenced in part by the success of GaAs photovoltaics, the highest  efficiencies cannot be achieved unless the solar cell is also designed to be a good light emitting diode (LED).   The light trapping structure requires two components, a back mirror and a textured glass.  This requires one to internally trap radiation by reflecting any lost radiation back, extending the time and probability that this energy can be reused, which ultimately improves photon recycling. The optical design is important so that the only loss mechanism is photons exiting at the front surface. surface, so ZnO or another transparent contact should be used.  The back mirror can be implemented by SiO₂ \cite{Zhao_2010} \cite{Andreani_2012}. The design and number of mirrors can be optimized according to any particular situation via simulation \cite{Wang_2013}. Different possible mirror geometries are illustrated in Figure .  Particularly encouraging is a numerical simulation of a proposed ultra thin cell structure \cite{Khosroabadi_2014} with back mirrors, reaching open-circuit voltage of 1.062V, and overall efficiency of 21.02%.