Semi-transparent, printable, and bifacial CIGS thin film solar cells for power generating windows

Semi-transparent, printable, and bifacial CIGS thin film solar cells for power generating windows
Semi-transparent; Pritable; CIGS; Bifacial
Issue Date
2013 KIST-IMCM SYMPOSIUM for innovative materials
Solution processed chalcopyrite compound film (CuInGaS2, CIGS) was synthesized on transparent conducting oxide substrates (tin-doped indium oxide, ITO) aiming at fabrication of semi-transparent and bifacial inorganic thin film solar cells by a low cost and printable method. According to the solar cell performance of the CIGS solar cell devices with the Cㅈ 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%). Compared to the simple sum of the efficiencies of the front and rear side illumination only, the bifacial illumination resulted in an extra increase of the apparent power conversion efficiency in the range of 0.1~0.5 %, depending on the CIGS film thickness. 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. interior illumination) can be efficiently utilized for improving the overall solar cell efficiency of bifacial devices. Semi-transparent CIGS solar cells also revealed visible light transmission to some degrees applicable to power generating windows. The details of the fabrication method and device characteristics will be discussed in the presentation.
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