Abstract
We report here experimental demonstration of crystalline semiconductor Si nanomembrane thin film solar cells based on room temperature frame-assisted membrane transfer (FAMT) process. Low-temperature compatible annealing processes have also been investigated for optimal metal contact formation. For two micrometer thick p-n junction Si solar cells, we obtained an open circuit voltage of 0.38 V and power efficiency of 1.64%, without any anti-reflection coating or light trapping schemes. Incorporating optimal anti-reflection coating, light trapping and plasmonic structures, we expect the cell efficiency to approach 10% and more for 2 μm thick Si cells. The results demonstrate a promising future for such a new type of cost effective flexible thin film solar cells, based on crystalline semiconductor membranes.
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