Presentation Information
[9p-P06-21]Fabrication and Light Stability Evaluation of Flexible Perovskite Mini-Modules Using One-Step Inkjet Printing
〇Nao Saito1, Tomoyuki Tobe2, Ryoto Funayama3, Tsutomu Miyasaka1, Masashi Ikegami1 (1.Toin Univ. of Yokohama, 2.KISTEC, 3.Kogyo,Co.Ltd.)
Keywords:
perovskite solar cells,inkjet,stability
Perovskite solar cells (PSCs) are paid much attention due to their high efficiency and low-cost potential, with further applications expected as a light-weight and flexible solar cells. In this study, we fabricated flexible mini-modules on PET films using a scalable one-step inkjet printing method to deposit the perovskite layer. The modules have a planar structure: PET/ITO/SnO2/CsFA-based perovskite/Spiro-OMeTAD/Au, in a shape of a 70 mm square with six series-connected cells. To assess light stability, devices without sealing were exposed to continuous 1 sun-equivalent LED illumination under nitrogen at 25 °C . The module outputs was continuously measured by Maximum power point tracking (MPPT) method using a source meter, and IV characteristics were recorded at every one-hour over 350 hours. Results showed that the open-circuit voltage (Voc) remained stable for the first 100 hours, while the short-circuit current (Isc) gradually decreased. Despite this, maximum power (Pmax) was initially maintained. A sudden Pmax drop occurred after 100 hours, accompanied by declines in both Voc and fill factor (FF), suggesting localized cell degradation in the series module. Further investigation compared module durability with that of single cells, focusing on how the fabrication process and structural design influence long-term stability. These insights contribute to improving the reliability of flexible PSC modules produced by inkjet printing.