Solution processed bifacial CIGS thin film solar cells

Solution processed bifacial CIGS thin film solar cells
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Chalcopyrite compound film (CuInGaS2, CIGS) was synthesized on transparent conducting oxide substrates (tin-doped indium oxide, ITO) based on solution process aiming at fabrication of semi-transparent and bifacial inorganic thin film solar cells by a low cost and printable method. Paste coating method was applied to prepare CIGS thin films using a methanol based precursor solution followed by two-step heat treatment process (oxidation and sulfurization). According to the solar cell performance with the CIGS thin films of three different thickness (400, 800, and 1200 nm), the solar cell device with the thickest film (1200 nm) resulted in the highest power conversion efficiency for front side illumination (5.61%) while the 800 nm thick film revealed the best solar to electricity conversion performance for rear side illumination (1.01%). We also found that there is an extra increase of the apparent power conversion efficiency in the range of 0.1~0.5 % compared to the simple sum of the efficiencies of the front and rear side illumination only during the bifacial illumination. We also confirmed that this extra output power acquisition due to bifacial irradiation was not apparently influenced by the light intensity of the rear side illumination, implying that weak light (e.g. indoor light) can be efficiently utilized for improving the overall solar cell efficiency of bifacial devices.
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