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Carrier Generation and Recombination

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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

Modulating carrier dynamics through perovskite film engineering.

Swee Sien Lim¹, Wee Kiang Chong, Ankur Solanki

¹Energy Research Institute @NTU (ERI@N), Interdisciplinary Graduate School Nanyang Technological University, Singapore.

Physical Chemistry Chemical Physics : PCCP

|June 28, 2016

Summary

Controlling perovskite film morphology is crucial for devices. Substrate and solvent treatments impact charge dynamics, with toluene treatment affecting morphology more on plasma-cleaned substrates, but increasing surface traps.

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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

Area of Science:

Materials Science
Photovoltaics
Spectroscopy

Background:

Precise morphological control of perovskite films is essential for high-performance photovoltaic and light-emitting devices.
The interplay between substrate/perovskite antisolvent treatments and charge dynamics requires further investigation.
Understanding morphology-kinetics relationships is key to optimizing perovskite film performance.

Purpose of the Study:

To correlate the morphology-kinetics relationship in perovskite films under different substrate and antisolvent treatments.
To investigate the influence of plasma-cleaned vs. piranha-etched substrates and toluene treatments on perovskite film morphology and charge dynamics.
To elucidate the complex effects of surface treatments on charge carrier behavior in perovskite thin films.

Main Methods:

Ultrafast optical spectroscopy was employed to study charge dynamics.
Perovskite films were prepared on plasma-cleaned and piranha-etched substrates.
Antisolvent (toluene) treatments were applied to the perovskite films.

Main Results:

Toluene treatment influenced perovskite film morphology more significantly on plasma-cleaned substrates compared to piranha-etched ones.
Surprisingly, toluene treatment increased surface trap densities, limiting improvements in carrier relaxation lifetimes despite better surface morphology.
Hole injection into spiro-OMeTAD was inhibited in toluene-treated films on piranha-etched substrates, potentially due to energy band realignment.

Conclusions:

Substrate and antisolvent treatments have complex, competing effects on perovskite film morphology and charge kinetics.
Piranha-etching of substrates may improve electron and hole diffusion length balance.
Findings provide insights into optimizing perovskite film treatments for enhanced device performance.