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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: Jan 9, 2026

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

Weak-Interaction-Driven Self-Positioning for Multi-Site Modification in Perovskite Solar Cells.

Longchen Tao¹, Niping Chen¹, Chen Zhao¹

¹College of Energy, College of Physical Science and Technology, College of Chemistry and Chemical Engineering, College of Material, State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, Xiamen University, Xiamen, 361005, China.

Small (Weinheim an Der Bergstrasse, Germany)

|December 8, 2025

Summary

A novel self-positioning strategy enables multi-site interfacial engineering in perovskite solar cells without extra deposition steps. This approach enhances efficiency and voltage, nearing theoretical limits for scalable solar energy.

Keywords:

alkali metal phthalocyanines multi‐site modification perovskite solar cells voltage loss weak interaction

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Published on: March 2, 2021

Area of Science:

Materials Science
Renewable Energy
Photovoltaics

Background:

Interfacial engineering is crucial for perovskite solar cells (PSCs) to overcome efficiency limitations.
Current multi-site modification methods are complex, requiring additional layers and precise control.
Achieving high open-circuit voltage (V_OC) and power conversion efficiency (PCE) necessitates suppressing non-radiative recombination and optimizing energy levels.

Purpose of the Study:

To develop a simplified, effective multi-site interfacial modification strategy for PSCs.
To investigate the self-positioning behavior of metal phthalocyanine derivatives for targeted modification.
To enhance the performance of PSCs by improving the built-in electric field and reducing recombination losses.

Main Methods:

A weak-interaction-driven self-positioning strategy using metal phthalocyanine-based modifiers (Na₂Pc, Li₂Pc).
Spatially selective self-positioning of ligands and alkali metal ions during film formation.
Analysis of modifier dissociation and ion migration toward the SnO₂/perovskite interface.

Main Results:

Spontaneous migration of alkali metal ions to the SnO₂/perovskite interface and ligand enrichment at the upper surface.
Synergistic multi-site modification significantly enhanced the built-in electric field.
Suppression of non-radiative recombination led to a V_OC of 1.204 V and PCE of 25.60% for small-area devices.
High V_OC of 1.177 V achieved for larger 1.0 cm² devices.

Conclusions:

The proposed self-positioning strategy offers a simplified route for multi-site interfacial engineering in PSCs.
This method effectively suppresses non-radiative recombination and boosts V_OC, approaching theoretical limits.
The approach demonstrates strong potential for scalable and high-performance perovskite solar cell applications.