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Related Experiment Video

Updated: Oct 5, 2025

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation
06:49

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Volatile Solid Additive-Assisted Sequential Deposition Enables 18.42% Efficiency in Organic Solar Cells.

Jianqiang Qin1,2, Qianguang Yang2, Jiyeon Oh3

  • 1MOE Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, School of Energy & Power Engineering, Chongqing University, Chongqing, 400044, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|January 24, 2022
PubMed
Summary

A novel sequential deposition strategy using a volatile solid additive significantly improves organic solar cell performance. This method enhances molecular order and phase separation, achieving a record 18.42% power conversion efficiency.

Keywords:
morphology optimizationorganic solar cellssequential depositionsolid additive

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Renewable Energy

Background:

  • Morphology optimization of the active layer is crucial for enhancing organic solar cell (OSC) performance.
  • Controlling molecular order and phase separation in the solid state is key to device efficiency.

Purpose of the Study:

  • To develop a volatile solid additive-assisted sequential deposition (SD) strategy for OSCs.
  • To investigate the impact of 1,4-diiodobenzene (DIB) as a volatile additive on active layer morphology and performance.

Main Methods:

  • Sequential deposition (SD) strategy using polymer donor D18-Cl, acceptor N3, and volatile additive 1,4-diiodobenzene (DIB).
  • Fabrication of organic solar cells (OSCs) with D18-Cl:N3 active layers using different deposition methods (mixture, SD, DIB-assisted SD).
  • Characterization of active layer morphology using angle-dependent grazing-incidence wide-angle X-ray scattering (GIWAXS).

Main Results:

  • DIB-assisted SD method resulted in finer phase separation and enhanced molecular crystallinity compared to other methods.
  • The optimized morphology led to superior charge transport and extraction.
  • Achieved a champion power conversion efficiency (PCE) of 18.42%, with a short-circuit current density (Jsc) of 27.18 mA cm⁻² and fill factor (FF) of 78.8%.

Conclusions:

  • The combination of volatile solid additive and sequential deposition is an effective strategy for developing high-performance OSCs.
  • This approach significantly enhances molecular ordering and phase separation in the active layer.
  • The reported performance represents a significant advancement in binary sequential deposition OSCs.