D 8.7 Identification of optical markers to control the timing for quenching of perovskite PV layer

D8.7 Identification of optical markers to control the timing for quenching of perovskite PV layers

This report dives into the realm of in-situ characterization in perovskite solar cells, unraveling key insights through various optical markers. Expanding on the significance of UV-Vis and photoluminescence (PL) spectroscopies, it explores their role in controlling perovskite layers, with a focus on quenching timing. The employed multi-faceted approach, integrated with the SPINBOT automated platform, uncovered crucial findings. UV-Vis absorption spectra exhibited uniformity, signaling consistent film thickness, yet additional markers were needed for comprehensive quality assessment. PL spectroscopy emerged as a robust metric, revealing insights into film microstructure and radiative recombination efficiency. This knowledge played a pivotal role in guiding the timing of quenching during film fabrication. Spatial PL intensity distribution maps showcased variations based on antisolvent quenching timing, underscoring PL intensity as a key indicator of film homogeneity. Applying these insights to perovskite solar cell fabrication, the report assessed device performance metrics, such as photocurrent density, open-circuit voltage, fill factor, and power conversion efficiency. Correlating PL findings with electrical characteristics validated the role of PL markers in optimizing device performance. In essence, this study establishes the critical importance of selecting appropriate optical markers to control quenching timing in perovskite PV layers. This strategic selection is instrumental in ensuring uniform film quality and enhancing the overall performance of perovskite solar cells, contributing significantly to advancements in photovoltaic technology