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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...

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Efficiently Passivated PbSe Quantum Dot Solids for Infrared Photovoltaics.

Sisi Liu¹, Kao Xiong¹, Kang Wang¹

¹School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.

|January 29, 2021

Summary

Researchers developed a hybrid ligand strategy for lead selenide (PbSe) quantum dot (QD) solar cells. This method enhances passivation, improving performance and achieving a record infrared power conversion efficiency (IR-PCE) of 1.31%.

Keywords:

PbSe quantum dots hybrid ligands infrared solar cells passivation trap states

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Area of Science:

Materials Science
Nanotechnology
Photovoltaics

Background:

Infrared (IR) solar cells offer improved efficiency by capturing low-energy IR photons.
Lead selenide (PbSe) quantum dots (QDs) are excellent IR absorbers but suffer from high trap-state density due to poor passivation.

Purpose of the Study:

To develop a novel hybrid ligand co-passivation strategy for PbSe QD solar cells.
To address the challenges of etching and poor passivation in PbSe QDs.
To improve the performance of IR solar cells.

Main Methods:

A hybrid ligand co-passivation strategy using halide anions and Cd cations was employed.
Passivation targeted both Pb and Se sites in PbSe QDs.
The strategy aimed to improve QD solid quality, trap-state control, and carrier lifetime.

Main Results:

The hybrid passivation strategy significantly improved PbSe QD solid quality.
Excellent trap-state control and prolonged carrier lifetime were achieved.
Record IR power conversion efficiency (IR-PCE) of 1.31% under 1100-nm-filtered solar illumination was obtained.
High external quantum efficiency (EQE) of 80% at ~1295 nm was demonstrated.

Conclusions:

The hybrid ligand co-passivation strategy is effective for enhancing PbSe QD solar cell performance.
This approach overcomes previous limitations related to PbSe QD passivation.
The achieved results represent a significant advancement in PbSe QD-based IR solar cell technology.