Е-Публикации
Технически университет - София

Abstract: This study investigates the impact of spray-coated inorganic charge transport layers (ETLs) on perovskite thin-film solar cell performance, addressing the electrical performance issues of perovskite devices by exploring the use of aluminum oxide (Al2O3) as an ETL. Aluminum oxide films of varying thicknesses (10-25 nm) were deposited onto perovskite layers via ultrasonic spray coating, and the resulting solar cell characteristics were analyzed. The results demonstrated that an Al2O3 thickness of 20 nm yielded the best power conversion efficiency (PCE) of 13.91%, attributed to improved light absorption and optimized interface engineering. However, thicknesses exceeding 20 nm led to decreased performance due to the insulating properties of Al2O3. This research confirms that spray coating is a scalable method for ETL deposition and highlights the importance of optimizing ETL thickness to enhance perovskite solar cell performance.

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