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Effects of oxidation state on photovoltaic properties of reactively magnetron sputtered hole-selective WO<sub>x</sub> contacts in silicon heterojunction solar cells
摘要： The stoichiometry value x of WOx, or its oxidation state, is crucial for improving performances of the hole-selective contact heterojunction silicon solar cell. However, it is challenging to tune the films’ oxidation state using the well-known evaporation method. In this study, a simulation was performed to analyze the effect of x on short-circuit current (Jsc) loss, attributed to the hole-selective contact in the device. Compared to the thickness of WOx layer, x has a more important role in minimizing Jsc loss. Based on the simulation, the WOx/c-Si heterojunction solar cells having hole-selective WOx contacts with tuned x to vary its oxidation state were fabricated using reactive magnetron sputtering. The relationships of the open-circuit voltage (Voc) and Jsc with respect to x were similar. The experimentally determined Jsc increased from 34.7 to 36.6 mA/cm2 when x was increased from 2.72 to 2.77; this result is consistent with the simulation. Nevertheless, fill factor (FF) reduced with the increase of x, owing to the reduced conductivity of WOx. Both oxidation state and film conductivity must be as high as possible to simultaneously achieve high Voc, Jsc, and FF. The lowest x yielded a solar cell efficiency of 13.3%.
关键词： Current loss,Tungsten oxide,Hole-selective contact,Heterojunction solar cell
更新于2025-09-19 17:13:59
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Sputtered Transparent Electrodes (IO:H and IZO) with Low Parasitic Near-Infrared Absorption for Perovskite-Cu(In,Ga)Se <sub/>2</sub> Tandem Solar Cells
摘要： Hybrid lead halide perovskite solar cells (PSCs) in tandem application with copper indium gallium diselenide (CIGS) solar cells represent one of the most promising all-thin-film technologies for next-generation photovoltaic devices. To minimize parasitic near-infrared (NIR) absorption losses in the electrodes, this work advances hydrogenated indium oxide (IO:H) and indium zinc oxide (IZO) electrodes for semi-transparent perovskite solar cells. The total NIR absorptance (800 nm to 1300 nm) of the perovskite top cell is reduced to <7 %, maximizing the bottom cell output current. Already taking first steps towards up-scaling, the perovskite active area is increased to match the CIGS active area of 0.5 cm2, and the RS is optimized by the implementation of a metal grid. The semitransparent perovskite solar cell reaches a power conversion efficiency of 15 %. Combined with a CIGS bottom solar cell, a 4-terminal tandem solar cell with 23 % power conversion efficiency is demonstrated. We conduct detailed current loss analyses of the complete tandem devices to monitor and evaluate the improvements of this work.
关键词： CIGS,tandem,indium oxide,TCO,current loss analysis,Perovskite
更新于2025-09-16 10:30:52