Abstract
In this work, CdS/CdTe thin-film solar cells were grown on a mica sheet and delaminated through a water assisted lift-off process and transfer to the substrate of interest. An CdCl <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> vapor treatment was applied for the CdS buffer layer and CdTe absorber layer, individually. We observed that two-time CdCl <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> treated films (one for CdS and second for CdTe) can help enhance the recrystallization, yielding larger grain sizes for both CdS buffer layer and CdTe absorber layer compared to one-time CdCl <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> treatment after CdTe deposition. Finally, we succeeded to fabricate ultrathin, lightweight, and flexible polycrystalline CdTe solar cells with a power conversion efficiency of 12.6 % with a high specific power (W/Kg).
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