期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 235, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.solmat.2021.111451
关键词
Cadmium telluride; Back contact; Hole transport layer; Bifacial; Copper iodide (CuI)
资金
- Air Force Research Laboratory [FA9453-18-2-0037, FA9453-19-C1002]
- U.S. DOE's office of Energy Efficiency and Renewable Energy (EERE) under Solar Energy Technologies Office (SETO) [DE-EE0008974]
The study investigated the utilization of copper iodide nanoparticles as a hole transport layer in cadmium sulfide/cadmium telluride photovoltaics, achieving significant improvements in device efficiency and fill factor. Solar cells with a CuI/ITO back contact demonstrated photoconversion efficiencies of 11.6% under front illumination and 5.5% under back illumination.
We report the role of copper iodide (CuI) nanoparticles (NPs) as a hole transport layer (HTL) in cadmium sulfide/ cadmium telluride (CdS/CdTe) photovoltaics. These CuI NPs were prepared using solution processing at room temperature and used to fabricate monofacial and bifacial CdTe solar cells with different back contacts. Using CuI/Au as the back contact, the device efficiency reached to 14.8% with outstanding fill factor (FF) of 79.2%. Replacing the gold (Au) electrode with sputtered transparent indium tin oxide (ITO), a CuI/ITO back contact yielded photoconversion efficiencies (PCEs) of 11.6% and 5.5% under front and back illumination respectively. Bifacial devices (CdTe/ITO) without the CuI NP HTL have an efficiency of 7.0% and 1.0% for front and back illumination, respectively. For CuI/ITO, a current collection of 12.0 mAcm(-2) was observed upon back illumination which significantly improved over an ITO-only back contact (5.0 mAcm(-2)). The PCE obtained from back illumination was enhanced when using CuI NPs as the HTL due to the reduced back barrier height, and improved back interface as determined by temperature dependent current vs. voltage characteristics and impedance spectroscopy analysis. The improvement in device performance of the bifacial configuration is a significant step forward toward realizing thin film photovoltaic modules which harvest energy incident on the rear of the module.
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