Regensburg 2025 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 32: Poster Session II

CPP 32.44: Poster

Donnerstag, 20. März 2025, 09:30–12:00, P3

The Construction of Temperature Gradient during Annealing to Guide Crystallization Direction — •Yiran Shi — Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany

Perovskite solar cells have gained significant attention as promising candidates for next-generation photovoltaics due to their outstanding advantages. The quality of the perovskite layer is a crucial determinant of the efficiency and stability of photovoltaic devices. As a polycrystalline thin film, the size and compactness of crystals are key quality metrics, closely linked to the annealing process. Conventional annealing typically involves placing the thin film, post-nucleation, on a fixed-temperature heating platform for crystal growth. Without external guidance, crystallization usually progresses top-down, preferentially completing at the upper surface. This sequence often traps solvents within the film, hindering evaporation and leading to void formation, which negatively affects film quality and device performance. To address this issue, we propose an improved annealing strategy by introducing a vertical thermal gradient to guide a bottom-up crystallization process. This approach aims to delay top-surface crystallization, allowing solvents to escape more effectively and reducing void formation. From the results about SEM and GIWAX, it is improved film quality, with enhanced structural integrity and reduced defects, offering a pathway to optimize perovskite photovoltaic performance.

Keywords: perovskite solar cell; crystalization