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Related Experiment Video

Updated: Aug 6, 2025

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

Published on: September 8, 2017

Distinguishing Electron Diffusion and Extraction in Methylammonium Lead Iodide.

P E Brown^1,2, A Ruseckas¹, L K Jagadamma¹

¹Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS, United Kingdom.

The Journal of Physical Chemistry Letters

|March 21, 2023

Summary

This summary is machine-generated.

Time-resolved photoluminescence reveals electron diffusion in hybrid perovskite solar cells. A fullerene layer enhances electron transfer, making diffusion the limiting factor for charge extraction.

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Last Updated: Aug 6, 2025

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

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Published on: September 8, 2017

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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

Published on: February 27, 2017

Area of Science:

Materials Science
Photovoltaics
Spectroscopy

Background:

Charge diffusion and extraction are critical for solar cell performance.
Hybrid perovskite solar cells offer promising efficiency but require optimized charge transport.

Purpose of the Study:

To investigate electron diffusion and transfer in hybrid perovskite films.
To distinguish between diffusion and transfer processes and identify rate-limiting steps.
To evaluate the impact of interlayers on charge extraction.

Main Methods:

Utilizing time-resolved photoluminescence spectroscopy.
Employing site-selective excitation from opposite sides of the sample.
Analyzing electron diffusion and transfer dynamics in methylammonium lead iodide (MAPbI₃) films.

Main Results:

Electron transfer velocity between MAPbI₃ and SnO₂ is significantly enhanced by a fullerene monolayer.
Electron diffusion within the MAPbI₃ layer becomes the rate-limiting step for charge extraction.
Site-selective excitation successfully separated diffusion and transfer processes.

Conclusions:

Optimizing electron diffusion in MAPbI₃ is key to improving electron extraction efficiency.
Fullerene interlayers can accelerate charge transfer, shifting the bottleneck to diffusion.
This study provides insights for designing more efficient n-i-p type perovskite solar cells.