Multiple-Trapping Model for the Charge Recombination Dynamics in Mesoporous-Structured Perovskite Solar Cells

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Organic-inorganic hybrid perovskite solar cells (PSCs) face performance bottlenecks despite rapid advancements.
• Understanding charge-carrier recombination dynamics is crucial for further breakthroughs in PSC efficiency.
• Mesoporous-structured perovskite solar cells (MPSCs) share photoelectric dynamics similarities with dye-sensitized solar cells (DSSCs).

Purpose of the Study:

• To propose a novel physical model for describing charge recombination dynamics in MPSCs.
• To adapt the multiple-trapping model from DSSCs for application in MPSCs.
• To elucidate the relationship between recombination processes and trap-state distribution in MPSCs.

Main Methods:

• Application and rational modification of the multiple-trapping model for charge recombination dynamics.
• Analysis of experimental data to validate the proposed physical model.
• Assignment of perovskite- and TiO2-dominating charge-recombination processes.

Main Results:

• A novel physical model was developed, showing good agreement with experimental data for MPSCs.
• The model successfully assigned perovskite- and TiO2-dominant charge-recombination pathways.
• The study discussed the influence of trap-state distribution on these recombination dynamics.

Conclusions:

• Achieving an optimal balance between perovskite- and TiO2-dominant recombination is essential for enhancing MPSC performance.
• The developed model provides deeper insights into the photoelectric conversion mechanisms in MPSCs.
• This work contributes to the fundamental understanding required for next-generation perovskite solar cell development.