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Related Concept Videos

Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Related Experiment Video

Updated: Aug 9, 2025

Morphology Control for Fully Printable Organic&#8211;Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
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Efficient and stable organic solar cells enabled by multicomponent photoactive layer based on one-pot polymerization.

Bin Liu1,2, Huiliang Sun3,4, Jin-Woo Lee5

  • 1Guangdong Engineering Technology Research Center for Photoelectric Sensing Materials & Devices, Guangzhou Key Laboratory of Sensing Materials & Devices, Center for Advanced Analytical Science, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou, 510006, P.R. China.

Nature Communications
|February 22, 2023
PubMed
Summary

Researchers developed stable organic solar cells (OSCs) using a novel multicomponent photoactive layer. This breakthrough balances high power conversion efficiency with over 1000 hours of operational stability.

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Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization
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Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization
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Area of Science:

  • Materials Science
  • Organic Electronics
  • Renewable Energy

Background:

  • Degradation of bulk heterojunction film morphology is a major challenge for organic solar cell (OSC) practical application.
  • Achieving long-term operational stability alongside high power conversion efficiency in OSCs is crucial for commercial viability.

Purpose of the Study:

  • To develop highly thermally stable organic solar cells (OSCs) with improved efficiency and operational lifetime.
  • To investigate the role of multicomponent photoactive layers in enhancing OSC stability and performance.

Main Methods:

  • Facile one-pot polymerization to synthesize multicomponent photoactive layers.
  • Fabrication of organic solar cells (OSCs) using the novel photoactive layer.
  • In-depth opto-electrical and morphological characterizations to analyze film properties and device performance.

Main Results:

  • The developed OSCs achieved a high power conversion efficiency of 11.8%.
  • The devices demonstrated excellent operational stability, retaining over 80% of their initial efficiency after 1000 hours.
  • Multicomponent photoactive layers, particularly PM6-b-L15 block polymers, contributed to frozen, fine-tuned film morphology and balanced charge transport.

Conclusions:

  • A balance between high device efficiency and long operational lifetime for OSCs has been realized.
  • The findings suggest a promising pathway for developing low-cost and long-term stable organic solar cells.
  • Backbone entanglement and synergistic polymer fractions are key to maintaining morphology and charge transport in stable OSCs.