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Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Updated: Mar 19, 2026

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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Defect-Anchored Dipole Molecules Induce Surface Polarization Facilitating High-Performance Inverted Perovskite Solar

Weichun Pan1, Jihuai Wu2, Jiexi Pan1

  • 1Engineering Research Center of Environment-Friendly Functional Materials, Ministry of Education, Fujian Key Laboratory of Photoelectric Functional Materials, College of Materials Science and Engineering, Huaqiao University, Xiamen, 361021, People's Republic of China.

Nano-Micro Letters
|March 18, 2026
PubMed
Summary
This summary is machine-generated.

Surface modification with 4-aminocyclohexanone hydrochloride (ACHCl) reduces interfacial losses in perovskite solar cells (PSCs). This enhances charge transport, leading to a 26.12% power conversion efficiency and improved device stability.

Keywords:
4-aminocyclohexanone hydrochloride (ACHCl)Dipole effectInterfacial lossesPerovskite solar cells (PSCs)Surface polarization

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Efficiency and stability of inverted perovskite solar cells (PSCs) are limited by charge-carrier and energy losses at interfaces.
  • Interfacial defects and misalignment hinder optimal performance in PSCs.

Purpose of the Study:

  • To reduce interfacial losses in PSCs by modifying the perovskite film surface.
  • To enhance charge-carrier transport and energy-level alignment using a dipolar molecule.

Main Methods:

  • Introduction of 4-aminocyclohexanone hydrochloride (ACHCl), a dipolar molecule, onto perovskite films in p-i-n structured PSCs.
  • Utilizing surface defects to anchor ACHCl, inducing surface polarization and reducing interfacial defects.
  • Analysis of ACHCl's interaction with perovskite surface defects (uncoordinated lead ions and halide vacancies).

Main Results:

  • ACHCl effectively passivates surface defects, reducing trap-state density and defect-assisted recombination.
  • Surface polarization induced by ACHCl optimizes energy-level alignment and enhances charge-carrier extraction.
  • ACHCl-modified PSCs achieved a power conversion efficiency of 26.12% with improved operational stability.

Conclusions:

  • Surface modification with ACHCl is a viable strategy to mitigate interfacial losses in PSCs.
  • The study demonstrates significant improvements in PSC efficiency and stability through defect passivation and energy-level engineering.