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Related Concept Videos

P-N junction01:11

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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Inverted perovskite solar cells with N-type organic small molecule dopant optimization.

Mengyan Feng1, Binbin Wang1, Yaowu Wang1

  • 1School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China.

The Journal of Chemical Physics
|May 15, 2026
PubMed
Summary

Researchers developed a new N-type organic molecule, SMX2, to improve perovskite solar cells (PSCs). Doping the electron transport layer (ETL) with SMX2 enhanced device efficiency to 20.06% and stability.

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Interface contact properties, charge recombination, and energy level alignment in inverted perovskite solar cells (PSCs) are key limitations.
  • Developing efficient and stable electronic transport layer (ETL) materials is critical for PSC advancement.

Purpose of the Study:

  • To design and synthesize a novel N-type organic small molecule, SMX2, for composite ETLs in PSCs.
  • To investigate the impact of SMX2 on interfacial properties, energy level alignment, and charge recombination in PSCs.

Main Methods:

  • Synthesis of a novel N-type organic small molecule, SMX2.
  • Fabrication of a composite ETL by incorporating SMX2 into [6,6]-phenyl-C61-butyric acid methyl ester.
  • Characterization of the ETL-perovskite interface and device performance.

Main Results:

  • SMX2 improved interfacial compatibility, contact quality, and energy level alignment.
  • SMX2 passivated defects and reduced non-radiative recombination.
  • The SMX2-doped ETL resulted in a champion PSC with 20.06% power conversion efficiency and maintained 92.8% efficiency after 30 days of air storage.

Conclusions:

  • SMX2 is an effective ETL modification material for enhancing PSC performance and stability.
  • This work offers guidance for developing advanced ETL materials for high-performance, long-lifetime PSCs.