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Related Experiment Video

Updated: May 5, 2026

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Improving Small-Molecules Based OSCs Performance Through Molecular Optimization: A Computational DFT Analysis.

Sania Ismaeel1, Shamsa Bibi2, Saba Jamil1

  • 1Department of Chemistry, University of Agriculture, Faisalabad, 38000, Pakistan.

Journal of Fluorescence
|July 7, 2025
PubMed
Summary
This summary is machine-generated.

We computationally designed organic solar cell (OSC) donor molecules, optimizing side chains and backbones for enhanced efficiency. The selenophenyl-substituted molecule M6 showed the highest absorption and performance, demonstrating effective molecular engineering for advanced OSCs.

Keywords:
DFTElectron withdrawing groupsOSCsOptoelectronic propertiesSelenophenyl

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Computational Chemistry

Background:

  • Organic solar cells (OSCs) offer low-cost, flexible alternatives to traditional photovoltaics.
  • Improving donor molecule design is crucial for enhancing OSC efficiency and performance.
  • Computational methods enable rapid screening and optimization of novel materials.

Purpose of the Study:

  • To computationally design and optimize novel donor molecules for organic solar cells (OSCs).
  • To investigate the impact of molecular structure, including core variations and side-chain modifications, on photovoltaic properties.
  • To identify key molecular engineering strategies for high-performance small molecule donors in asymmetric-}$OSCs.

Main Methods:

  • Systematic design of benzodithiophene (BDT) and thieno[3,2-b]thiophene (TT) derivatives (M1-M7).
  • Modification of central cores and side chains with various substituents to tune electronic properties.
  • Computational analysis of molecular structure, π-π stacking, aggregation, and electronic characteristics.

Main Results:

  • Designed molecules (M1-M7) exhibit tunable electronic properties and improved photovoltaic performance.
  • Twisted backbone structures suppress molecular aggregation, enhancing charge transport.
  • The selenophenyl-substituted molecule (M6) showed the highest absorption (625 nm) and favorable HOMO offset for efficient exciton dissociation.
  • Optimized morphology and charge transport led to high fill factors (84-91%) and short-circuit current density (24.85 mA cm⁻²).

Conclusions:

  • Molecular engineering strategies, including twisted backbones and optimized side chains, are vital for high-performance small molecule donors.
  • The designed molecules demonstrate potential for achieving high open-circuit voltage (1.10-1.41 V) and overall power conversion efficiency (PCE).
  • This study provides a roadmap for rational design of efficient donor materials for advanced organic solar cell applications.