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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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Updated: Jun 30, 2025

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

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Back Interface and Absorber Bulk Deep-Level Trap Optimization Enables Highly Efficient Flexible Antimony Triselenide

Jia Yang¹, Mingdong Chen², Guojie Chen²

¹State Key Laboratory of Complex Non-ferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, 650093, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|March 21, 2024

Summary

Flexible Antimony Triselenide (Sb₂Se₃) solar cells achieve 8.23% efficiency with a novel Molybdenum Trioxide (MoO₃) interlayer. This interlayer improves crystal quality, reduces interface barriers, and passivates defects for enhanced performance and durability.

Keywords:

Back interface Defect Efficiency Flexible solar cell Sb2Se3

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Area of Science:

Materials Science
Renewable Energy
Device Physics

Background:

Antimony Triselenide (Sb₂Se₃) possesses a unique 1D crystal structure suitable for flexible electronics.
Fabricating high-efficiency flexible Sb₂Se₃ solar cells is hindered by poor back contact interfaces and intrinsic defects.

Purpose of the Study:

To introduce a Molybdenum Trioxide (MoO₃) interlayer to improve the back contact interface in flexible Sb₂Se₃ solar cells.
To enhance the performance and durability of flexible Sb₂Se₃ photovoltaic devices.

Main Methods:

Fabrication of flexible Sb₂Se₃ solar cells with a Mo-foil/Mo/MoO₃/Sb₂Se₃/CdS/ITO/Ag structure.
Characterization of the MoO₃ interlayer's effect on Sb₂Se₃ crystalline quality, growth orientation, and defect passivation.
Evaluation of the solar cells' electrical properties, flexibility, and durability.

Main Results:

The MoO₃ interlayer enhanced Sb₂Se₃ crystalline quality and promoted favorable [hk1] growth.
Reduced barrier height at the back contact and effective passivation of defects were observed.
The flexible solar cells demonstrated excellent durability under bending and achieved a power conversion efficiency of 8.23%.

Conclusions:

The MoO₃ interlayer is a viable strategy for improving flexible Sb₂Se₃ solar cell performance.
This approach offers a straightforward method to enhance device efficiency and expand applications in flexible photovoltaics.