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Close-Space Sublimation-Deposited Ultra-Thin CdSeTe/CdTe Solar Cells for Enhanced Short-Circuit Current Density and Photoluminescence

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Advanced Architecture for Colloidal PbS Quantum Dot Solar Cells Exploiting a CdSe Quantum Dot Buffer Layer.

Tianshuo Zhao¹, Earl D Goodwin¹, Jiacen Guo¹

¹Department of Materials Science and Engineering, ‡Department of Chemistry, and §Department of Electrical and Systems Engineering, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States.

|September 21, 2016

Summary

This summary is machine-generated.

A new cadmium selenide (CdSe) quantum dot buffer layer significantly boosts the performance of lead sulfide (PbS) quantum dot solar cells. This enhancement is achieved by optimizing the junction, suppressing recombination, and increasing power conversion efficiency by 25%.

Keywords:

CdSe PbS buffer layer interface quantum dot solar cell

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Area of Science:

Materials Science
Nanotechnology
Renewable Energy

Background:

Colloidal quantum dot solar cells require advanced architectures for improved performance.
Lead sulfide (PbS) quantum dot solar cells face challenges with interface recombination and energy band alignment.

Purpose of the Study:

To introduce a cadmium selenide (CdSe) quantum dot buffer layer to optimize the heterojunction in PbS quantum dot solar cells.
To enhance the power conversion efficiency of these solar cells by addressing interface issues.

Main Methods:

Fabrication of PbS quantum dot solar cells with an inserted CdI2-treated CdSe quantum dot buffer layer between ZnO nanoparticles and PbS quantum dots.
Characterization using optical, electrical, and analytical measurements.
Tuning of CdSe quantum dot properties (surface, size) to optimize carrier concentration and energy band alignment.

Main Results:

The CdSe quantum dot buffer layer effectively suppresses interface recombination.
The buffer layer contributes additional photogenerated carriers.
Significant increases were observed in open-circuit voltage and short-circuit current.
A 25% overall increase in solar power conversion efficiency was achieved.

Conclusions:

The integration of a CdSe quantum dot buffer layer is a viable strategy to enhance PbS quantum dot solar cell performance.
Optimizing heterojunction properties through quantum dot engineering is crucial for efficient solar energy conversion.