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Inkjet Printing All Inorganic Halide Perovskite Inks for Photovoltaic Applications

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Passivation Using Molecular Halides Increases Quantum Dot Solar Cell Performance.

Xinzheng Lan¹, Oleksandr Voznyy¹, Amirreza Kiani¹

¹Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada.

Advanced Materials (Deerfield Beach, Fla.)

|November 19, 2015

Summary

This summary is machine-generated.

Researchers developed a new passivation method using molecular iodine and lead sulfide colloidal quantum dots (CQDs). This breakthrough enhances solar cell performance, achieving a record power conversion efficiency of 9.9% for CQD solar cells.

Keywords:

PbS quantum dots molecular iodine passivation solar cells

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Area of Science:

Materials Science
Photovoltaics
Nanotechnology

Background:

Colloidal quantum dot (CQD) solar cells offer tunable bandgaps for efficient light absorption.
Achieving high power conversion efficiency in CQD solar cells requires effective surface passivation to minimize charge recombination.

Purpose of the Study:

To develop and evaluate a novel solution-based passivation strategy for lead sulfide (PbS) CQD solar cells.
To improve carrier diffusion length and charge collection efficiency in CQD solar devices.

Main Methods:

A passivation scheme utilizing molecular iodine in conjunction with PbS CQDs was developed.
The passivation's effect on carrier dynamics and device performance was investigated.

Main Results:

The molecular iodine passivation significantly improved carrier diffusion length in the solid CQD film.
This enhancement enabled the fabrication of thicker solar cell devices without compromising charge collection.
A certified power conversion efficiency of 9.9% was achieved, setting a new record for CQD solar cells.

Conclusions:

Solution-based passivation with molecular iodine is a highly effective strategy for advancing CQD solar cell technology.
The developed method overcomes previous limitations in device thickness and charge transport.
This work represents a significant step towards the commercial viability of high-performance CQD solar cells.