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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

11.1K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.1K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

1.2K
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Related Experiment Video

Updated: Jan 10, 2026

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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Chelate Multisite Coordination for High-Performance Inverted Perovskite Solar Cells.

Xue Lu1, Kunpeng Li1, Xiong Chang1

  • 1Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, P. R. China.

ACS Applied Materials & Interfaces
|November 23, 2025
PubMed
Summary

New chelating agent N,N'-ethylenediamine disuccinic acid (EDDS) effectively passivates perovskite solar cell defects. This boosts power conversion efficiency to 24.57% and enhances operational stability.

Keywords:
chelationdefect passivationenergy level alignmentinverted perovskite solar cellsmultisitenonradiative recombination

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Renewable Energy

Background:

  • Interfacial defects, especially nonradiative recombination centers, hinder charge transport and reduce perovskite solar cell (PSC) performance.
  • Small molecule doping is a promising strategy for improving film formation, crystal growth, and defect passivation in PSCs.

Purpose of the Study:

  • To introduce N,N -ethylenediamine disuccinic acid (EDDS) as a chelating agent for passivating interfacial defects in PSCs.
  • To investigate the mechanism of defect passivation and its impact on device performance and stability.

Main Methods:

  • Density Functional Theory (DFT) calculations to study coordination bond formation.
  • Experimental characterization of film properties and device performance.
  • Long-term operational stability testing under continuous illumination.

Main Results:

  • EDDS effectively passivates uncoordinated Pb2+ and I- defects via stable Pb-O and I-O coordination bonds.
  • Nonradiative recombination is suppressed, leading to prolonged charge carrier lifetimes.
  • EDDS-incorporated inverted PSCs achieve a champion power conversion efficiency of 24.57% and retain 90.2% efficiency after 3000 hours.

Conclusions:

  • Multisite coordination chemistry using EDDS is highly effective in mitigating interfacial recombination in PSCs.
  • EDDS significantly advances the development of highly efficient and stable perovskite photovoltaics.