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This is to certify that your paper entitled «Comparing the methods of reducing recombination inthe ETL layer of perovskite solar cells and calculatingthe efficiency of each of the methods and the method ofdoping the layer with SnO۲» was indexed with 8 pages, in the CIVILICA citation database, code COI:ICIRES19_001, after evaluation and approval of the referees of the "19th International Conference on Innovation and Research in Engineering Sciences (ICIRES) 2024.

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