Impact of molecular weight on charge carrier dissociation in solar cells from a polyfluorene derivative

Autor: Jörgen Sweelssen, Sjoerd Veenstra, J. D. Kotlarski, Date Moet, Marc M. Koetse, Martijn Lenes, Paul W. M. Blom, B. de Boer
Přispěvatelé: TNO Industrie en Techniek, Zernike Institute for Advanced Materials
Rok vydání: 2009
Předmět:
Space charge effects
Analytical chemistry
High Tech Systems & Materials
Molecular weight
Dissociation (chemistry)
law.invention
chemistry.chemical_compound
FIELD-EFFECT MOBILITY
DEPENDENCE
law
Benzothiadiazoles
Materials Chemistry
Polyfluorene
Polymer
Hole transports
chemistry.chemical_classification
Industrial Innovation
Efficient dissociation
Bound electrons
Photovoltaic cells
Molecular electronics
Heterojunction
Condensed Matter Physics
COPOLYMERS
Electronic
Optical and Magnetic Materials
Chemical physics
Heterojunctions
Optical modeling
Charge carrier
Fullerenes
Polyfluorene derivative
Dissociation
Solar cells
Materials science
In-phase
Short-circuit currents
Phase separation
Bulk heterojunction solar cells
Photovoltaic performance
Low molecular weight
Polymer solar cell
Solar power generation
Biomaterials
Fill factor
Numerical device simulation
Solar cell
Weighing
Electrical and Electronic Engineering
Charge carrier dissociation
General Chemistry
PERFORMANCE
Switching circuits
TRANSPORT
METHANOFULLERENE
Cell membranes
Orders of magnitude
chemistry
Electronics
Zdroj: Organic Electronics: physics, materials, applications, 7, 10, 1275-1281
Organic Electronics, 10(7), 1275-1281. ELSEVIER SCIENCE BV
ISSN: 1566-1199
DOI: 10.1016/j.orgel.2009.07.002
Popis: The effect of the molecular weight of poly[9,9-didecanefluorene-alt-(bis-thienylene) benzothiadiazole] (PF10TBT) on the photovoltaic performance of fullerene-based bulk heterojunction solar cells is investigated. An increase in molecular weight of two orders of magnitude results in a 30% increase of the short-circuit current and a rise of the fill factor from 0.45 to 0.63. Electron and hole transport are found to be virtually unaffected by changing molecular weight, which means that space-charge effects do not play a role in low molecular weight devices. Using optical modeling and numerical device simulations, we demonstrate that at low molecular weight the efficiency is mainly limited by a short lifetime of bound electron-hole pairs. This short lifetime prohibits efficient dissociation and is attributed to a deficiency in phase separation for low molecular weights. (C) 2009 Elsevier B.V. All rights reserved.
Databáze: OpenAIRE
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