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Related Concept Videos

P-N junction01:11

P-N junction

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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 13, 2026

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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Multifunctional Cellulose Derivative Enables Efficient and Stable Wide-Bandgap Perovskite Solar Cells by Inhibiting

Chaoqi Liu1, Jun Chu1, Xixi Yu1

  • 1Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|January 12, 2026
PubMed
Summary

Wide-bandgap perovskite solar cells suffer from ion migration and phase segregation. A new cellulose derivative, L12-CMCNa, enhances stability and efficiency by passivating defects and forming a protective layer.

Keywords:
enhanced stabilityhydrophobically modified sodium cellulosesuppressed halide ion migrationwide‐bandgap perovskite

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Wide-bandgap perovskites (>1.65 eV) with high bromine content are prone to photo-induced phase segregation.
  • This degradation stems from iodide ion (I-) migration and conversion to molecular iodine (I2) under stress, causing irreversible performance loss.

Purpose of the Study:

  • To enhance the performance and stability of 1.68 eV wide-bandgap perovskite solar cells (PSCs).
  • To address the critical challenge of ion migration and phase segregation in wide-bandgap PSCs.

Main Methods:

  • Development of a novel hydrophobically modified cellulose derivative, L12-CMCNa, for interfacial engineering.
  • Utilizing L12-CMCNa to anchor functional groups (-COO- and -OH) at the perovskite interface.
  • In situ formation of a low-dimensional perovskite capping layer by reacting L12-CMCNa with residual PbI2.

Main Results:

  • L12-CMCNa suppresses iodide ion migration by passivating Pb2+ defects and iodide vacancies.
  • The modified PSCs achieved a champion power conversion efficiency (PCE) of 23.25% and a fill factor (FF) of 83.80%.
  • Unencapsulated devices retained over 90% of initial efficiency after 1000h (ISOS-L-1I), 800h (ISOS-D-1), and 1000h (ISOS-D-2I) of stress testing.

Conclusions:

  • The dual-passivation strategy of L12-CMCNa effectively immobilizes ions at the interface, enhancing device stability.
  • L12-CMCNa significantly improves the operational and environmental stability of 1.68 eV WBG PSCs.
  • This work presents a promising approach for developing highly stable wide-bandgap perovskite solar cells.