Scientific article
OA Policy
English

Twisted Crystalline Organic Semiconductor Photodetectors

Published inAdvanced functional materials, vol. 33, no. 19, 2212531
Publication date2023-03-06
First online date2023-03-06
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.

Keywords
  • Banded spherulite
  • Crystal anisotropies
  • Crystal twisting
  • Melt growth
  • Organic semiconductors
Research groups
Funding
  • U.S. Department of Energy [DE-AC02-06CH11357]
  • Basic Energy Sciences [DE‐AC02‐06CH11357]
  • National Science Foundation [DMR-1627428]
  • National Science Foundation - Collaborative Research: Charge Transport in Helicoidal Molecular Crystals [2003997]
  • National Science Foundation - NYU Materials Research Science and Engineering Center [1420073]
Citation (ISO format)
JEONG, Sehee et al. Twisted Crystalline Organic Semiconductor Photodetectors. In: Advanced functional materials, 2023, vol. 33, n° 19, p. 2212531. doi: 10.1002/adfm.202212531
Main files (2)
Article (Accepted version)
accessLevelPublic
Article (Published version)
accessLevelRestricted
Identifiers
Journal ISSN1616-301X
61views
537downloads

Technical informations

Creation19/10/2024 17:00:35
First validation30/10/2024 14:19:22
Update30/10/2024 14:19:22
Status update30/10/2024 14:19:22
Last indexation26/11/2024 15:42:16
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack