biostudies-literatureBetancur PFEuropean Social Fund PlusAgencia Estatal de InvestigaciónMinistry of Energy, IsraelNextGenerationEUConselleria d'Educació, Investigació, Cultura i Esport8410-8417https://www.ebi.ac.uk/biostudies/studies/S-EPMC12376095biostudies-literatureUnknown16(33)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) TiO₂/ZrO₂/ITO PSCs with varying TiO₂ 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-TiO₂ 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.The journal of physical chemistry lettersWorking Mechanisms of Triple-Oxide Mesoporous Hole-Transport-Layer-Free Printable Perovskite Solar Cells via Impedance Spectroscopy.PMC12376095CEX2021-001230-SCNS2023-144270TED2021-131600B-C32ESGENT 010/2024TED2021-131600B-C31MFA/2022/020PID2023-151880OB-C31CIACIF/2022/183MFA/2022/040Betancur PFSohmer MBoix PPMora-Sero IEtgar LfalseWorking Mechanisms of Triple-Oxide Mesoporous Hole-Transport-Layer-Free Printable Perovskite Solar Cells via Impedance Spectroscopy.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) TiO₂/ZrO₂/ITO PSCs with varying TiO₂ 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-TiO₂ 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.2025-01-01T00:00:00Z2025 Aug2026-05-09T10:36:24.661Z2026-04-08T00:48:01.102ZS-EPMC123760954077864910.1021/acs.jpclett.5c01405