Mesoporous Perovskite Solar Cells: Material Composition, Charge-Carrier Dynamics, and Device Characteristics

Yixin Zhao, Alexandre M. Nardes, Kai Zhu

Research output: Contribution to journalArticlepeer-review

115 Scopus Citations


We report on our investigations on charge transport and recombination in TiO2-based mesoporous solar cells using PbI2 and various perovskite compositions, including CH3NH3PbI3, CH3NH3PbI2Br, CH3NH3PbIBr2, and CH3NH3PbBr3. The mesoporous TiO2 film is about 650 nm thick. Electron microscopy measurements show that no perovskite capping layer is formed on the top surface of the TiO2 film. Intensity-modulated photocurrent/photovoltage spectroscopies show that the electron diffusion coefficient and recombination lifetime are governed by the underlying mesoporous TiO2 film and thus do not depend on the perovskite composition. However, replacing the perovskite absorber with PbI2 leads to a diffusion coefficient that is about a factor of 5 slower than that in perovskite-based devices. We also find that TiCl4 treatment of the mesoporous TiO2 film prior to device fabrication substantially reduces the charge recombination kinetics in mesoporous perovskite solar cells.

Original languageAmerican English
Pages (from-to)301-312
Number of pages12
JournalFaraday Discussions
StatePublished - 2014

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry 2014.

NREL Publication Number

  • NREL/JA-5900-62210


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