Enhancing exciton diffusion length provides new opportunities for organic photovoltaics

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Abstract

Organic semiconductors can potentially revolutionize solar cell technology by offering very thin, lightweight, and flexible modules for outdoor and indoor power generation. Light absorption in organic semiconductors generates a bound electron-hole pair (exciton), which needs to travel to the interface between electron donor and acceptor materials to dissociate into charge carriers. Because the exciton diffusion length in organic semiconductors is typically much shorter than the light absorption depth (∼100 nm), planar donor-acceptor heterojunctions are inefficient, and most effort has been dedicated to optimization of bulk heterojunctions with nanoscale phase separation. In this Perspective, we review recent findings and new approaches to increase the exciton diffusion length and discuss how these improvements can benefit environmentally friendly production of solar modules using organic nanoparticles or graded heterojunctions obtained by sequential deposition of electron donor and acceptor.
Original languageEnglish
Pages (from-to)341-354
JournalMatter
Volume3
Issue number2
DOIs
Publication statusPublished - 5 Aug 2020

Keywords

  • Organic solar cell
  • Organic semiconductor
  • Energy transfer
  • Heterojunction
  • Light-harvesting
  • Solution-processing

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