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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: Dec 13, 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

Molecular Ferroelectrics-Driven High-Performance Perovskite Solar Cells.

Xiao-Li Xu¹, Ling-Bo Xiao¹, Jie Zhao¹

¹College of Energy, Soochow Institute for Energy and Materials InnovationS, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou, 215006, China.

Angewandte Chemie (International Ed. in English)

|July 29, 2020

Summary

Introducing a homochiral molecular ferroelectric into perovskite solar cells (PSCs) enhances charge separation and defect passivation. This innovation boosts PSC efficiency to 21.78% by reducing energy loss.

Keywords:

built-in electric fields defect passivation molecular ferroelectrics poling

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Area of Science:

Materials Science
Renewable Energy
Solid-State Physics

Background:

Nonradiative recombination is a primary energy loss mechanism in perovskite solar cells (PSCs).
Effective charge separation and defect passivation are crucial for improving PSC performance.
Existing methods for enhancing built-in fields and passivation are limited.

Purpose of the Study:

To introduce a homochiral molecular ferroelectric into PSCs for the first time.
To enhance the built-in electric field within the perovskite film.
To improve charge separation, transportation, and defect passivation.

Main Methods:

Integration of a homochiral molecular ferroelectric into the perovskite active layer.
Characterization of the perovskite film's built-in electric field.
Photoluminescence spectroscopy to assess defect passivation and charge carrier dynamics.
Fabrication and performance testing of photovoltaic devices.

Main Results:

The molecular ferroelectric significantly enlarged the built-in electric field of the perovskite film.
Defect passivation was achieved due to structural similarities between the ferroelectric and perovskite.
Photoluminescence intensity increased approximately eightfold, indicating reduced nonradiative recombination.
Electron trap-state density was significantly reduced.
Power conversion efficiency reached 21.78%.

Conclusions:

Homochiral molecular ferroelectrics are effective in enhancing built-in fields and passivating defects in PSCs.
This approach offers a novel strategy for overcoming energy loss mechanisms in perovskite photovoltaics.
The developed photovoltaic molecular ferroelectric PSCs demonstrate high efficiency and potential for commercialization.