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The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
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Isomerized Dithienopyrazine-Based Solid Additive Enables Organic Solar Cells With 20.5% Efficiency.

Siqi Wu1, Huizhen Xu2, Hao Wang1

  • 1Key Laboratory of Functional Molecular Solids, Ministry of Education, School of Chemistry and Materials Science, Anhui Normal University, Anhui, China.

Angewandte Chemie (International Ed. in English)
|April 11, 2026
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Summary

Designing isomeric solid additives, syn-dithieno[2,3-b:3

Keywords:
dithienopyrazineisomeric solid additivesmorphologyorganic solar cellsphotovoltaic properties

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Solid additives are crucial for optimizing organic solar cells (OSCs) by controlling film morphology and photoactive layer aggregation.
  • The chemical structure of additives significantly impacts their performance in OSCs.
  • High power conversion efficiencies (PCEs) in OSCs depend on efficient charge transport and optimized morphology.

Purpose of the Study:

  • To design and investigate two isomeric solid additives, syn-dithieno[2,3-b:3',2'-e]pyrazine (syn-DTPy) and anti-dithieno[2,3-b:2',3'-e]pyrazine (anti-DTPy), for enhancing OSC performance.
  • To explore the isomer-dependent conformational effects on morphology control in OSCs.
  • To establish structure-property relationships for designing advanced solid additives.

Main Methods:

  • Synthesis of syn-DTPy and anti-DTPy isomeric additives.
  • Incorporation of additives into the D18:L8-BO organic solar cell system.
  • Characterization of film morphology, phase separation, and charge transport pathways.
  • Performance evaluation of OSCs, including power conversion efficiency (PCE) and fill factor (FF).

Main Results:

  • Anti-DTPy additive optimized phase separation and charge transport pathways through directional intermolecular interactions.
  • OSCs incorporating anti-DTPy achieved a remarkable PCE of 20.5% and a high FF of 81.9%.
  • A distinct isomer-dependent conformational effect was observed for morphology control.

Conclusions:

  • Isomeric structure of solid additives plays a critical role in morphology control and OSC performance.
  • Anti-DTPy demonstrates significant potential for advancing high-efficiency organic solar cells.
  • The findings provide valuable insights for the rational design of novel solid additives for organic electronics.