Various metal oxides are probed as extrinsic thin tunnel barriers in Semiconductor Insulator Semiconductor solar cells. Namely Al2O3, ZrO2, Y2O3, and La2O3 thin films are in between n-type ZnO:Al (AZO) and p-type Si substrates by means of Atomic Layer Deposition. Low reverse dark current–density as low as 3×10−7 A/cm2, a fill factor up to 71.3%, and open-circuit voltage as high as 527 mV are obtained, achieving conversion efficiency of 8% for the rare earth oxide La2O3. ZrO2 and notably Al2O3 show drawbacks in performance suggesting an adverse reactivity with AZO as also indicated by X-ray Photoelectron Spectroscopy.
https://www.researchpad.co/tools/openurl?pubtype=article&doi=10.1016/j.solmat.2013.04.028&title=ALD grown bilayer junction of ZnO:Al and tunnel oxide barrier for SIS solar cell&author=&keyword=SIS solar cell,AZO,Tunnel barrier,Metal oxides,ALD,XPS,&subject=Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials,Surfaces, Coatings and Films,
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