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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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Related Experiment Video

Updated: Jan 18, 2026

Flash Infrared Annealing for Perovskite Solar Cell Processing

Flash Infrared Annealing for Perovskite Solar Cell Processing

Published on: February 3, 2021

Additive-Free Crystallization Modulation for Efficient Perovskite Solar Cells by a Transverse Pulsed Electric Field.

Hai-Fang Li¹, Pengkun Zhu¹, Zhiyu Zhang¹

¹State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, School of New Energy, North China Electric Power University, Beijing, 102206, China.

|September 11, 2025

Summary

Applying an electric field to perovskite solar cells guides ion movement, reducing defects and improving performance. This method enhances crystal orientation and film stability, boosting efficiency over 24%.

Keywords:

defect self‐passivation gradient distribution iodide vacancies perovskite solar cells pulsed electric fields

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Area of Science:

Materials Science
Solid-State Physics
Photovoltaics

Background:

Controlling ion migration is key for perovskite film morphology and crystallization.
Limited research exists on regulating specific ion species for oriented growth and defect reduction.

Purpose of the Study:

To introduce and investigate the use of a transverse pulsed electric field (e-field) for controlling perovskite constituent migration.
To explore the impact of e-field-driven ion migration on crystal orientation, defect suppression, and solar cell performance.

Main Methods:

Utilized a transverse pulsed electric field (e-field) to direct ion migration during perovskite film growth.
Employed e-field-assisted thermal annealing for MAPbI3 films.
Investigated the resulting lateral gradient in iodine distribution and its effects.

Main Results:

Achieved directional migration of perovskite constituents, leading to improved crystal orientation and reduced iodide loss.
Observed e-field-driven migration of mobile I- ions, facilitating vacancy filling and passivation of Pb2+ sites.
Demonstrated mitigation of iodine-related defects and non-radiative recombination, enhancing perovskite solar cell efficiency and stability.
Adapted the strategy for mixed-cation/halide perovskites, achieving over 24% efficiency.

Conclusions:

E-field-driven ion migration offers a novel approach to perovskite crystallization control, alternative to chemical additives.
Self-passivation of iodide vacancies via controlled ion migration significantly improves device performance and stability.
The e-field strategy shows promise for high-performance perovskite solar cells and is adaptable to various compositions.