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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

Multication perovskite 2D/3D interfaces form via progressive dimensional reduction.

Andrew H Proppe^1,2, Andrew Johnston², Sam Teale²

¹Department of Chemistry, University of Toronto, Toronto, ON, Canada.

Nature Communications

|June 10, 2021

Summary

This summary is machine-generated.

Researchers investigated the formation of 2D/3D perovskite interfaces, crucial for efficient solar cells. They found that controlling the dimensional reduction of perovskites during fabrication enhances device performance and stability.

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Area of Science:

Materials Science
Renewable Energy
Solid-State Chemistry

Background:

2D/3D interfaces are key to high-performing perovskite solar cells, improving efficiency and stability.
The mechanism of 3D-to-2D perovskite conversion and interface assembly remains poorly understood.

Purpose of the Study:

To elucidate the formation process of 2D/3D perovskite interfaces during device fabrication.
To understand how ligand incorporation drives the dimensional reduction of perovskites.
To correlate interface formation with photovoltaic device performance.

Main Methods:

In situ Grazing-Incidence Wide-Angle X-ray Scattering (GIWAXS) to observe interface formation during spin-coating.
Density Functional Theory (DFT) simulations to model ligand-lattice interactions.
Fabrication and characterization of perovskite photovoltaic devices.

Main Results:

Observed progressive dimensional reduction (3D to 2D/1D) of perovskites upon exposure to vinylbenzylammonium ligands.
DFT simulations revealed sequential ligand incorporation driven by phenyl ring stacking, leading to perovskite bisection.
Controlled transformation via antisolvent concentration resulted in conformal 2D layers, enhancing carrier extraction and boosting device efficiency from 20% to 22%.

Conclusions:

The study reveals a mechanism for progressive dimensional reduction in perovskites, crucial for stable 2D/3D interface formation.
Controlling this transformation offers a pathway to further optimize perovskite solar cell performance.
Understanding and manipulating 2D/3D interface dynamics is vital for advancing perovskite photovoltaics.