Silver Alloying in Highly Efficient CuGaSe <sub>2</sub> Solar Cells with Different Buffer Layers

نویسندگان

چکیده

This study evaluates the effect of silver alloying, stoichiometry, and deposition temperature wide-gap (Ag,Cu)GaSe2 (ACGS) absorber films for solar cell applications. Devices using a standard CdS buffer exhibit strong anticorrelation between open-circuit voltage (VOC) short-circuit current density (JSC), with VOC decreasing JSC increasing toward stoichiometric composition. Increasing ACGS leads to larger grains improved JSC, while is not affected. By adding more (maximum tested [Ag]/([Ag]+[Cu]) [AAC] = 0.4), widening space charge region (SCR) significantly enhances carrier collection. Experimental quantum efficiency spectra can be accurately simulated when assuming very low diffusion length perfect collection in SCR. The highest 8.3% (without antireflection coating [ARC]) reached an AAC 0.4 grown at 600 °C. Replacing by (Zn,Sn)O lower electron affinity strongly mitigates interface recombination. Moreover, VOC–JSC evident anymore 11.2% (11.6% w/ARC, 985 mV, 18.6 mA cm−2, fill factor 61.0%) close-stoichiometric processed 650

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ژورنال

عنوان ژورنال: Solar RRL

سال: 2023

ISSN: ['2367-198X']

DOI: https://doi.org/10.1002/solr.202300208