Optical Properties of Organic Semiconductor Blends with Near-Infrared Quantum-Dot Sensitizers for Light Harvesting Applications

Autor: Itskos, Grigorios, Othonos, Andreas S., Rauch, T., Tedde, S. F., Hayden, O., Kovalenko, M. V., Heiss, W., Choulis, Stelios A.
Přispěvatelé: Itskos, Grigorios [0000-0003-3971-3801], Othonos, Andreas S. [0000-0003-0016-9116], Choulis, Stelios A. [0000-0002-7899-6296]
Rok vydání: 2011
Předmět:
Near Infrared
Solution-processed
Charge transfer process
Semiconductor quantum dots
General Materials Science
Photoinduced charge transfer
Organic semiconductor blends
Absorption (electromagnetic radiation)
Transient absorption
Optical properties
Interfacial charge transfer
Exciton emission
Bulk Heterojunction
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
Ultrafast decay
Charge transfer excitons
Engineering and Technology
Optoelectronics
Excitons
Fullerenes
Optical investigation
Ultra-fast
Photoinduced absorption
Infrared devices
Light-harvesting
Pump-probe experiments
Photoluminescence
Fullerene
Materials science
Exciton recombination
Exciton
Poly(3-Hexylthiophene)
Transient absorption measurements
Condensed Matter::Materials Science
Charge transfer
Ultrafast laser spectroscopy
Ternary blends
Semiconducting organic compounds
Relative ratios
Steady-state absorption
Absorption strength
Condensed Matter::Other
Renewable Energy
Sustainability and the Environment
business.industry
Photo-excitations
Organic semiconductor
Nanocrystal
Solar Cell
Quantum dot
Experiments
business
Exciton dissociation
Zdroj: Advanced Energy Materials
Adv.Energy Mater.
ISSN: 1614-6832
DOI: 10.1002/aenm.201100182
Popis: We report an optical investigation of conjugated polymer (P3HT)/fullerene (PCBM) semiconductor blends sensitized by near-infrared absorbing quantum dots (PbS QDs). A systematic series of samples that include pristine, binary and ternary blends of the materials are studied using steadystate absorption, photoluminescence (PL) and ultrafast transient absorption. Measurements show an enhancement of the absorption strength in the near-infrared upon QD incorporation. PL quenching of the polymer and the QD exciton emission is observed and predominantly attributed to intermaterial photoinduced charge transfer processes. Pump-probe experiments show photo-excitations to relax via an initial ultrafast decay while longer-lived photoinduced absorption is attributed to charge transfer exciton formation and found to depend on the relative ratio of QDs to P3HT:PCBM content. PL experiments and transient absorption measurements indicate that interfacial charge transfer processes occur more efficiently at the fullerene/polymer and fullerene/nanocrystal interfaces compared to polymer/nanocrystal interfaces. Thus the inclusion of the fullerene seems to facilitate exciton dissociation in such blends. The study discusses important and rather unexplored aspects of exciton recombination and charge transfer processes in ternary blend composites of organic semiconductors and near-infrared quantum dots for applications in solution-processed photodetectors and solar cells. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. 1 5 802 812 Cited By :56
Databáze: OpenAIRE
Externí odkaz: