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Micromolecule Postdeposition Process for Highly Efficient Inverted Perovskite Solar Cells.

Bing'e Li1, Jiangping Xing1, Valeriya Budnik2

  • 1School of Physics and Optoelectronic Engineering, Guangdong Provincial Key Laboratory of Sensing Physics and System Integration Applications, Guangdong University of Technology, Guangzhou 510006, China.

ACS Applied Materials & Interfaces
|February 24, 2025
PubMed
Summary

Researchers developed a new method using etidronic acid (EA) to improve perovskite solar cells (PSCs). This process fills interface vacancies in self-assembled monolayer (SAM) hole-transporting layers (HTLs), boosting PSC efficiency and performance.

Keywords:
facilitating the growth of perovskiteshole transport layermicromolecule postdeposition processperovskites solar cellsreducing vacancies at the interface

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Nanotechnology

Background:

  • Inverted perovskite solar cells (PSCs) show promise, driven by molecularly designed self-assembled monolayer (SAM) hole-transporting layers (HTLs).
  • Challenges remain in achieving compact, ordered SAM surfaces, leading to interfacial defects and hindering perovskite growth.

Purpose of the Study:

  • To introduce a micromolecule postdeposition strategy for enhancing SAM HTL interfaces.
  • To improve perovskite quality and boost the efficiency of inverted PSCs.

Main Methods:

  • A postdeposition process using etidronic acid (EA) was employed to modify the SAM HTL interface.
  • EA anchors to the substrate, filling vacancies and interacting with perovskite layers through its functional groups.
  • This process aims to passivate defects and facilitate carrier transport.

Main Results:

  • The micromolecule postdeposition effectively reduced vacancies at the SAM interface and passivated perovskite defects.
  • Improved carrier transport was observed due to the modified interface.
  • A champion power conversion efficiency (PCE) of 24.42% was achieved, significantly outperforming the control devices (20.08%).

Conclusions:

  • The postdeposition EA strategy offers a guided and broadly applicable approach for SAM interface engineering.
  • This method significantly advances the performance of inverted perovskite solar cells.
  • The findings pave the way for developing more efficient and stable PSCs.