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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: Sep 15, 2025

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

Published on: September 8, 2017

Synchronous Phase Transformation for Efficient Wide-Bandgap Perovskite Photovoltaics.

Yifan Li¹, Xinmin Zhao¹, Ni Meng¹

¹Hebei Key Laboratory of Optic-Electronic Information and Materials, Province-Ministry Co-construction Collaborative Innovation Center of Hebei Photovoltaic Technology, College of Physics Science and Technology, Hebei University, Baoding, 071002, China.

Advanced Materials (Deerfield Beach, Fla.)

|July 18, 2025

Summary

This summary is machine-generated.

Researchers developed a new strategy to create uniform halogen-phase perovskite films for solar cells. This method improves efficiency in wide-bandgap perovskite solar cells and tandem solar cells.

Keywords:

all‐perovskite tandem solar cells intermediate phase synchronous phase transformation wide‐bandgap perovskite solar cell

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Published on: February 27, 2017

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Last Updated: Sep 15, 2025

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

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Published on: September 8, 2017

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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

Area of Science:

Materials Science
Renewable Energy
Photovoltaics

Background:

Mixed-halogen wide-bandgap (WBG) perovskite materials offer tunable bandgaps for tandem solar cells (TSCs).
Inhomogeneous halogen phases in bromine-rich perovskite films limit the performance of WBG perovskite solar cells (PSCs) and TSCs.

Purpose of the Study:

To develop a synchronous halogen-phase transformation strategy for forming homogeneous halogen-phase perovskite films.
To improve the efficiency and stability of WBG PSCs and TSCs by addressing phase inhomogeneity.

Main Methods:

Introduction of 1,3-Dimethyl-2-imidazolidinone (DMI) into the perovskite precursor solution to form a stable DMI-PbX₂ adducted intermediate phase.
Synchronous transformation of the intermediate phase into a homogeneous halide-phase perovskite film during annealing.

Main Results:

A 1.76 eV-bandgap PSC achieved a record power conversion efficiency (PCE) of 21.42% (certified 21.18%) for WBG devices (>1.74 eV).
A 4-terminal all-perovskite TSC achieved a PCE of 29.66%, leveraging the high transmittance of the WBG PSC.

Conclusions:

The synchronous halogen-phase transformation strategy effectively produces homogeneous perovskite films.
This approach significantly enhances carrier extraction, suppresses recombination, and boosts the performance of WBG PSCs and TSCs.