Optimization of Hole Transport Layer (HTL)-Free Carbon-Based Perovskite Solar Cells Fabricated in Ambient Conditions
Thi Kim Cuc Mai a, Jaakko Palosaari a, Jari Juuti a, Janne Halme b
a Microelectronics Research Unit, Faculty of Information Technology & Electrical Engineering, P. O. Box 8000, FI-90014, University of Oulu, Finland.
b Department of Applied Physics, Aalto University School of Science, PO Box 11000, FI00076, Finland.
Poster, Thi Kim Cuc Mai, 212
Publication date: 6th February 2024

Carbon-based hole transport layer (HTL)-free printable perovskite solar cells (CPSCs) hold significant promise for commercialization thanks to their outstanding stability, low cost and scalable manufacturing.[1] In a standard CPSCs fabrication process, a compact TiO2 layer (c-TiO2) is usually created through spray pyrolysis, followed by the sequential screen printing of TiO2, ZrO2, and carbon layers to establish a mesoscopic scaffold for perovskite precursor infiltration.[2] In this study, the easily scalable screen-printing techniques are also employed to produce the c-TiO2 layer. Furthermore, to enhance commercial viability, perovskite infiltration is carried out entirely in ambient conditions. A two-step method is opted to obtain better pore filling and more uniform morphology of MAPbI3 perovskite absorber.[3] Enhancing the efficiency of CPSCs requires fine-tuning the thickness of scaffold layers and optimizing perovskite absorber formation, which involves adjusting various parameters including loading PbI2 amount, substrate and precursor temperature, annealing conditions, and immersion duration. Optimization of these parameters is crucial to achieve high-efficiency CPSCs fabricated under ambient conditions.

This work was supported by the Jane and Aatos Erkko Foundation and Technology Industries of Finland Centennial Foundation for CAPRINT project funding (#2430354811).

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