{
  "id": 7378666,
  "title": "Mapping charge-carrier dynamics to guide more efficient organic solar cells",
  "url": "https://urgent.news/2026/09/14/mapping-charge-carrier-dynamics-to-guide-more-efficient-organic-solar",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-14T19:00:15.000Z",
  "source": {
    "name": "Phys.org",
    "slug": "phys-org",
    "url": "https://phys.org/news/2026-09-carrier-dynamics-efficient-solar-cells.html"
  },
  "original_language": "en",
  "account": "Scientists at Sungkyunkwan University in South Korea have published a review detailing the ultrafast dynamics of charge carriers in organic photovoltaic materials. Unlike traditional silicon-based solar cells, organic optoelectronic devices can be lightweight, flexible, and transparent, making them promising candidates for efficient solar energy conversion. However, the microscopic processes occurring within these materials upon light absorption and subsequent electricity generation have remained elusive, with various studies yielding conflicting interpretations.\n\nTo address this challenge, the research team compiled and analyzed the findings from ultrafast spectroscopy experiments that measure light-matter interactions on extremely short timescales, specifically femtoseconds (one quadrillionth of a second). The review outlines three primary ultrafast spectroscopy techniques—transient absorption, pump-probe, and two-dimensional electronic spectroscopy—and maps out their respective capabilities and limitations in resolving the complex charge carrier dynamics. Additionally, the authors harmonized the terminology for intermediate states, which had been inconsistently applied across different research groups.\n\nThe review also clarifies the conditions under which observed signals can be confidently attributed to specific charge carrier states, revealing that discrepancies in reported results for the benchmark material PM6:Y6 may stem more from experimental variations, such as excitation wavelength and film processing, than from inherent material differences. Furthermore, the study synthesizes recent insights into the factors that influence charge carrier dynamics, including the molecular structure of nonfullerene acceptors, their nanoscale crystallinity, and the quadrupole moments generated by the molecules. These factors can lower energy barriers at the material interface and suppress unwanted charge recombination, providing guidelines for designing materials that balance high efficiency with long-term stability.\n\nThe authors emphasize that while ultrafast spectroscopy has advanced our understanding of charge generation, separation, and recombination processes in nonfullerene organic photovoltaics, there remains a critical need for operando measurements—those conducted under real device operating conditions. Meeting this challenge is essential for engineers and scientists to develop more efficient, durable, and commercially viable solar energy solutions.",
  "summary": "A Sungkyunkwan University (SKKU) research team led by professors Taeyeon Kim and Doo-Hyun Ko of the Department of Chemistry recently published a comprehensive review titled \"Carrier Dynamics in Nonfullerene Acceptor Organic Photovoltaics through Ultrafast Spectroscopy\" in the journal ACS Nano.",
  "key_points": [
    "Scientists map ultrafast dynamics of charge carriers in organic photovoltaics.",
    "Review harmonizes terminology for intermediate states in charge carrier processes.",
    "Optimized molecular structure and nanoscale crystallinity enhance efficiency and stability."
  ],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}