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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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Related Experiment Video

Updated: Jun 5, 2026

Flash Infrared Annealing for Perovskite Solar Cell Processing
05:15

Flash Infrared Annealing for Perovskite Solar Cell Processing

Published on: February 3, 2021

Bidentate Hole-Transporting Materials for Interface Passivation and High-Efficiency Inverted Perovskite Solar Cells.

Yogesh S Tingare1, Chaochin Su1, Yi-Xuan Huang2

  • 1Institute of Organic and Polymeric Materials, Research and Development Center for Smart Textile Technology, National Taipei University of Technology, Taipei, Taiwan.

Chemsuschem
|June 4, 2026
PubMed
Summary
This summary is machine-generated.

New enol-centered small-molecule hole-transporting materials (HTMs) enhance perovskite solar cell (PSC) efficiency and stability. These materials passivate interfacial defects, leading to a 22.74% power conversion efficiency and excellent operational longevity.

Keywords:
bidentate hole transport materialsinterface defect passivationinverted perovskite solar cellsperovskite absorber

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Organic Chemistry

Background:

  • Interface engineering is crucial for perovskite solar cell (PSC) efficiency and stability.
  • Multifunctional materials are key to addressing interfacial challenges in PSCs.

Purpose of the Study:

  • To design and synthesize novel enol-centered small-molecule hole-transporting materials (HTMs).
  • To investigate the structure-property-function relationships of these HTMs for PSC applications.
  • To achieve high efficiency and operational stability in PSCs using dopant-free interfacial layers.

Main Methods:

  • Rational design of enol-centered small molecules (DKcH, DKPh, DKTPA) with cooperative C═O and ‒OH moieties.
  • Systematic modulation of side arm substituents to tune electronic structure and film properties.
  • Fabrication and characterization of inverted MAPb(I0.9C0.1)3-based PSCs.

Main Results:

  • The designed HTMs effectively passivate perovskite surface defects through bidentate coordination.
  • Increasing molecular conjugation and π-π stacking improved film cohesion and thermal robustness.
  • The DKTPA-based PSCs achieved a high power conversion efficiency of 22.74%.
  • DKTPA devices demonstrated excellent stability, retaining 90.35% efficiency after 500 hours of illumination.

Conclusions:

  • Enol-centered HTMs represent a versatile platform for functional interfacial layers in PSCs.
  • General molecular design principles for stable, dopant-free interfacial layers were established.
  • The developed materials significantly advance the performance and stability of perovskite photovoltaics.