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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...
1.7K

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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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Spiro-Buckybowl-Structured Hole-Transporting Materials Toward High-Efficiency and Stable p-i-n Perovskite Solar

Junsheng Luo1,2, Heng Zhao1, Haomiao Yin1

  • 1National Key Laboratory of Electronic Films and Integrated Devices, School of Integrated Circuit Science and Engineering, University of Electronic Science and Technology of China, Chengdu, P. R. China.

Angewandte Chemie (International Ed. in English)
|April 14, 2026
PubMed
Summary

New spiro-buckybowl hole-transporting materials (HTMs) improve perovskite solar cell (PSC) performance. These organic semiconductors enhance efficiency and stability by optimizing interfaces and passivating defects.

Keywords:
defect passivationhole‐transporting materialsinverted perovskite solar cellsorganic semiconductorsspiro‐conjugation

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Renewable Energy

Background:

  • Perovskite solar cells (PSCs) require uniform hole-transporting materials (HTMs) for optimal efficiency and stability.
  • Interfacial interactions between HTMs and perovskite defects significantly impact device performance.

Purpose of the Study:

  • To develop novel spiro-buckybowl-shaped HTMs with enhanced properties for PSCs.
  • To investigate the impact of introducing chalcogen elements (Se, S) on HTM performance.
  • To improve perovskite crystallization and reduce defects through effective passivation.

Main Methods:

  • Synthesis of two spiro-buckybowl-shaped HTMs, Sp-Se and Sp-S, incorporating Se and S into sumanene frameworks.
  • Characterization of HTM properties, including molecular geometry, intermolecular interactions, and surface coverage.
  • Evaluation of PSC performance using the developed HTMs, focusing on efficiency and operational stability.

Main Results:

  • The 3D orthogonal geometry of spiro-buckybowl HTMs reduces aggregation and improves hole extraction.
  • The bowl-shaped π-system effectively passivates deep-level perovskite defects (Pb2+, VI).
  • Sp-S HTM resulted in a champion PSC efficiency of 25.54% and 92.5% stability over 1250 hours.

Conclusions:

  • Spiro-buckybowl molecular architecture offers a new design strategy for organic semiconductors in photovoltaics.
  • The developed HTMs significantly enhance PSC efficiency and long-term operational stability.
  • These findings pave the way for advanced perovskite solar cell technologies.