Effects of changes in the ETL/active layer and active layer/HTL interfaces on the transport of electrons and holes in Perovskite Solar Cells

Effects of changes in the ETL/active layer and active layer/HTL interfaces on the transport of electrons and holes in Perovskite Solar Cells

• Autor
• Helder Moreira Braga
• Co-autores
• André Sarto Polo
• Resumo

• Perovskite solar cells (PSCs) are gaining prominence as a promising class of semiconductor materials for solar energy conversion, owing to their remarkable efficiency, facile fabrication, and cost-effectiveness. Conversely, halide perovskite quantum dots (PQDs) manifest intrinsic properties that render them compelling for optoelectronic applications, including a low defect density, compatibility with large-scale deposition techniques, and a customizable bandgap. Additionally, all-inorganic perovskite exhibits superior stability under ambient conditions compared to organic-inorganic hybrid perovskite (PVK) materials. To augment the long-term stability of PSCs, a proven strategy involves the application of moisture-resistant layers to the PVK surface. Consequently, PQDs emerge as promising candidates for interface engineering in PSCs due to their stability and tunable bandgap position. In this study, we investigated the impact of CsPbBr3 PQDs on the morphology, optical, and structural properties of PVK layers. The incorporation of PQDs into PVK films was executed by depositing their suspension on the surface of the TiO2 substrate, followed by the formation of the MAPbI3 PVK film through the sequential deposition method. Another approach involved depositing QDs onto the MAPbI3 layer of MAI, resulting in a PVK QDs film on its surface. Preliminary scanning electron microscopy results reveal that the presence of PQDs induces distinct morphologies depending on the position in which the QDs were deposited in the PSC. Films deposited with PQDs before PVK formation exhibit similar morphology to PVK films without nanocrystals. However, PVK films with QDs on their surfaces have slightly different morphologies. X-ray diffraction (XRD) results suggest that the introduction of PQDs maintains the integrity of the perovskite structure. Furthermore, the photovoltaic results indicate that the QD layer does not impact the transport of electrons and holes in PSCs. Ongoing experiments involving these films in controlled environments aim to further elucidate their performance. 

   

• Palavras-chave
• Perovskite, Solar Cells, Semiconductor, Halide Perovskites, CsPbBr3 quantum dots
• Modalidade
• Comunicação oral
• Área Temática
• Nanociência e Nanotecnologia