Betancur Pablo F, Sohmer Maayan, Mora-Seró Iván, Etgar Lioz, Boix Pablo P
Instituto de Ciencia de los Materiales de la Universidad de Valencia (ICMUV), 46980 Paterna, València Spain.
Institute of Chemistry, Casali Center for Applied Chemistry, The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.
J Phys Chem Lett. 2025 Aug 21;16(33):8410-8417. doi: 10.1021/acs.jpclett.5c01405. Epub 2025 Aug 8.
All-printed mesoporous perovskite solar cells (PSCs) show great potential for scalable photovoltaic technologies, yet direct identification of their key working mechanisms by impedance spectroscopy (IS) is not well-established. IS response of printable hole transport layer (HTL)-free triple mesoporous (mp) TiO/ZrO/ITO PSCs with varying TiO electron transport layer (ETL) thicknesses (500-1200 nm) reveals strong interplay between the mesoporous scaffold architecture and charge carrier dynamics, significantly impacting resistive and capacitive features of the devices. The emergence of an intermediate-frequency feature can be related to chemical capacitance of the mp-TiO layer, a phenomenon commonly associated with dye-sensitized solar cells, decoupling recombination, and key transport phenomena for both charge carriers. An updated equivalent circuit model, incorporating chemical capacitance and associated transport/recombination resistances can capture these effects. These findings provide valuable insights into the role of mesoporous scaffold engineering in printable PSCs and offer a robust characterization tool for optimizing scalable photovoltaic architectures.
全印刷介孔钙钛矿太阳能电池（PSC）在可扩展光伏技术方面显示出巨大潜力，但通过阻抗谱（IS）直接识别其关键工作机制尚未完全确立。具有不同TiO电子传输层（ETL）厚度（500 - 1200 nm）的可印刷无空穴传输层（HTL）的三重介孔（mp）TiO/ZrO/ITO PSC的IS响应揭示了介孔支架结构与电荷载流子动力学之间的强烈相互作用，这对器件的电阻和电容特性有显著影响。中频特征的出现可能与mp - TiO层的化学电容有关，这是一种通常与染料敏化太阳能电池相关的现象，它解耦了复合以及两种电荷载流子的关键传输现象。一个包含化学电容以及相关传输/复合电阻的更新等效电路模型可以捕捉这些效应。这些发现为介孔支架工程在可印刷PSC中的作用提供了有价值的见解，并为优化可扩展光伏架构提供了一个强大的表征工具。
