skip to main content

SciTech ConnectSciTech Connect

Title: Structural and optoelectronic properties of hybrid bulk-heterojunction materials based on conjugated small molecules and mesostructured TiO{sub 2}

Improved hybrid bulk-heterojunction materials was fabricated by spin-casting a benchmark conjugated small molecule, namely, 3,6-bis(5-(benzofuran-2-yl)thiophen-2-yl)-2,5-bis(2-ethylhexyl) pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione (DPP(TBFu){sub 2}), into mesostructured TiO{sub 2}. Due to both a reduced molecular size and less hydrophobic nature of the conjugated molecules (relative to conjugated polymers), homogeneous and improved infiltration into the mesoporous TiO{sub 2} are achieved without the need for pre-treatment of the TiO{sub 2}. Remarkably, this small molecule can realize loadings of up to 25% of the total pore volume—2.5× the typical loadings achieved for conjugated polymers. The small molecule loading was determined using dynamic secondary ion mass spectroscopy and absorption spectroscopy. Further characterization such as charge transfer and nanoscale conducting atomic force microscopy helps to demonstrate the promise and viability of small molecule donors for hybrid optoelectronic devices.
Authors:
 [1] ; ;  [2] ;  [1] ;  [3]
  1. Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106 (United States)
  2. Department of Chemical Engineering, University of California, Santa Barbara, California 93106 (United States)
  3. (Saudi Arabia)
Publication Date:
OSTI Identifier:
22300014
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; ATOMIC FORCE MICROSCOPY; BENCHMARKS; HETEROJUNCTIONS; ION MICROPROBE ANALYSIS; MASS SPECTROSCOPY; MOLECULES; NANOSTRUCTURES; SPIN; TITANIUM OXIDES