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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: Aug 4, 2025

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

Published on: February 27, 2017

Constructing an Interfacial Gradient Heterostructure Enables Efficient CsPbI₃ Perovskite Solar Cells and Printed

Shan Tan^1,2, Chengyu Tan^1,2, Yuqi Cui^1,3

¹Beijing National Laboratory for Condensed Matter Physics, Renewable Energy Laboratory, Institute of Physics, Chinese Academy of Sciences (CAS), Beijing, 100190, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)

|April 6, 2023

Summary

This study introduces a novel interfacial treatment for cesium lead iodide perovskite solar cells (PSCs), significantly reducing defects and improving energy alignment. This breakthrough enhances PSC efficiency and stability for practical applications.

Keywords:

CsPbI3 energy level alignments gradient heterostructures passivation perovskite solar cells printed minimodules

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Area of Science:

Materials Science
Renewable Energy
Photovoltaics

Background:

Cesium lead iodide perovskite solar cells (CsPbI₃ PSCs) suffer from poor performance due to interfacial defects and energy level misalignment.
Nonradiative recombination at interfaces is a major limitation for achieving high-efficiency PSCs.

Purpose of the Study:

To develop an effective interfacial engineering strategy for CsPbI₃ PSCs.
To suppress nonradiative recombination and improve charge carrier dynamics.
To enhance the overall efficiency and stability of CsPbI₃ PSCs.

Main Methods:

Fabrication of CsPbI₃ PSCs using a low-temperature post-treatment with quaternary bromide salts.
Creation of an interfacial gradient heterostructure.
Analysis of ion diffusion, defect healing, and energy level alignment using advanced characterization techniques.

Main Results:

Achieved a champion power conversion efficiency of 21.31% with a fill factor of 0.854 for CsPbI₃ PSCs.
Demonstrated improved charge separation and collection due to optimized interfacial energy levels and reduced nonradiative recombination.
Reported a record efficiency of 16.60% for 12 cm² printed CsPbI₃ minimodules and superior stability for unencapsulated devices.

Conclusions:

The developed interfacial gradient heterostructure effectively heals defects and optimizes energy level alignment in CsPbI₃ PSCs.
The post-treatment method offers a viable route for fabricating high-performance and stable CsPbI₃ perovskite solar cells.
This approach paves the way for the commercial application of efficient and durable CsPbI₃ PSC technology.