Twisted Crystalline Organic Semiconductor Photodetectors

Sehee Jeong, Natercia Barbosa, Akash Tiwari, Emma K. Holland, Ling Yi Huang, Vinayak Bhat, Yongfan Yang, Yuze Zhang, St John Whittaker, Min Woo Kim, Aida Alaei, Pallavi Sundaram, Rochelle Spencer, Johanna Brazard, Dilhan M. Kalyon, Chad Risko, John E. Anthony, Takuji B.M. Adachi, Alexander G. Shtukenberg, Bart KahrStephanie S. Lee

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Optoelectronic properties of anisotropic crystals vary with direction requiring that the orientation of molecular organic semiconductor crystals is controlled in optoelectronic device active layers to achieve optimal performance. Here, a generalizable strategy to introduce periodic variations in the out-of-plane orientations of 5,11-bis(triisopropylsilylethynyl)anthradithiophene (TIPS ADT) crystals is presented. TIPS ADT crystallized from the melt in the presence of 16 wt.% polyethylene (PE) forms banded spherulites of crystalline fibrils that twist in concert about the radial growth direction. These spherulites exhibit band-dependent light absorption, photoluminescence, and Raman scattering depending on the local orientation of crystals. Mueller matrix imaging reveals strong circular extinction (CE), with TIPS ADT banded spherulites exhibiting domains of positive or negative CE signal depending on the crystal twisting sense. Furthermore, orientation-dependent enhancement in charge injection and extraction in films of twisted TIPS ADT crystals compared to films of straight crystals is visualized in local conductive atomic force microscopy maps. This enhancement leads to 3.3- and 6.2-times larger photocurrents and external quantum efficiencies, respectively, in photodetectors comprising twisted crystals than those comprising straight crystals.

Original languageEnglish
Article number2212531
JournalAdvanced Functional Materials
Volume33
Issue number19
DOIs
StatePublished - May 8 2023

Bibliographical note

Publisher Copyright:
© 2023 Wiley-VCH GmbH.

Keywords

  • banded spherulite
  • crystal anisotropies
  • crystal twisting
  • melt growth
  • organic semiconductors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Chemistry
  • Biomaterials
  • General Materials Science
  • Condensed Matter Physics
  • Electrochemistry

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