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P-N junction

P-N junction

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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Selenium-Diffusional Precursor Engineering for High-Efficiency CdSeTe Solar Cells with 80% Fill Factor.

Jiao Liu¹, Yanjie Gan², Yiliang Zhou¹

¹Institute of New Energy Technology, College of Physics and Optoelectronic Engineering, Jinan University, Guangzhou, 510632, China.

Small (Weinheim an Der Bergstrasse, Germany)

|November 30, 2025

Summary

Optimizing the precursor for graded Cadmium Selenide Telluride (CdSeTe) solar cells enhances device performance. This precursor management strategy improves microstructure and reduces recombination, achieving a 20.6% power conversion efficiency.

Keywords:

CdSeTe absorber selenium‐diffusional precursor solar cell

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Published on: March 6, 2020

Area of Science:

Materials Science
Photovoltaics
Thin-film Solar Cells

Background:

Graded Cadmium Selenide Telluride (CdSeTe) absorbers are key to exceeding conventional Cadmium Telluride (CdTe) solar cell efficiencies.
Device performance is critically dependent on the Se-diffusional precursor's characteristics.

Purpose of the Study:

To introduce a precursor-management strategy for optimizing Se diffusion and crystallization in CdSeTe absorbers.
To enhance the microstructure and interfacial properties of CdSeTe absorbers.

Main Methods:

Incorporation of oxygen and chlorine during Cadmium Selenide (CdSe) precursor processing.
Analysis of CdSeTe absorber microstructure, interfacial voids, and surface-potential fluctuations.
Fabrication and characterization of solar cell devices.

Main Results:

Improved CdSeTe absorber microstructure and suppressed buried interfacial voids.
Diminished surface-potential fluctuations, leading to reduced interfacial recombination.
Achieved a champion power conversion efficiency of 20.6% with excellent V_OC, J_SC, and FF.

Conclusions:

Precursor chemistry significantly impacts the performance of graded-absorber photovoltaics.
The developed precursor-management strategy is effective in advancing CdSeTe solar cell technology.
This approach offers a pathway to higher efficiency in thin-film solar cells.