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Related Experiment Video

Updated: Jan 20, 2026

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High-Performance Simple-Structured Planar Heterojunction Perovskite Solar Cells Achieved by Precursor Optimization.

Kaixuan Wang1, Zhenhua Lin1, Jing Ma1

  • 1State Key Laboratory of Wide Band Gap Semiconductor Technology, Shaanxi Joint Key Laboratory of Graphene, School of Microelectronics, Xidian University, 2 South Taibai Road, Xi'an 710071, China.

ACS Omega
|August 29, 2019
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Summary

High-quality lead halide precursors significantly improve perovskite solar cell performance by enhancing film quality and reducing defects. This advancement enables simpler fabrication of efficient solar cells, even on flexible substrates.

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Solid-State Physics

Background:

  • Planar perovskite solar cells (PSCs) offer low-temperature fabrication and high power conversion efficiency (PCE).
  • Existing PSCs often rely on complex compositional and interface engineering for performance optimization.
  • The quality of the perovskite precursor is crucial for device performance.

Purpose of the Study:

  • To investigate the impact of high-quality lead halide crystal precursors on perovskite film quality and PSC performance.
  • To explore the potential for simplified PSC fabrication by eliminating electron and hole interlayers.
  • To demonstrate high PCEs in interlayer-free PSCs on various substrates.

Main Methods:

  • Fabrication of PSCs using high-quality lead halide crystal precursors.
  • Characterization of perovskite film quality, light absorption, crystal defects, and charge recombination.
  • Performance testing of PSCs with and without electron/hole interlayers on glass and flexible substrates.

Main Results:

  • High-quality precursors enhanced perovskite film light absorption and reduced defects, suppressing charge recombination.
  • Device PCE improved significantly for CH3NH3PbI3 (8.9% to 15.0%) and MA0.7FA0.3PbI3-Cl (14.2% to 18.0%).
  • Electron and hole interlayer-free devices achieved high PCEs of 13.6% (glass) and 10.4% (flexible).

Conclusions:

  • High-quality lead halide precursors are critical for high-performance PSCs.
  • Simplified fabrication of PSCs is achievable by utilizing high-quality precursors, eliminating the need for interlayers.
  • This approach is particularly promising for scalable and printed PSC applications.