Time-independent charge carrier mobility in a model polymer: fullerene organic solar cell

Philippa, Bronson, Vijila, Chellappan, White, Ronald D., Sonar, Prashant, Burn, Paul L., Meredith, Paul, and Pivrikas, Almantas (2015) Time-independent charge carrier mobility in a model polymer: fullerene organic solar cell. Organic Electronics, 16. pp. 205-211.

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Abstract

The technique of photo-CELIV (charge extraction by linearly increasing voltage) is one of the more straightforward and popular approaches to measure the faster carrier mobility in measurement geometries that are relevant for operational solar cells and other optoelectronic devices. It has been used to demonstrate a time-dependent photocarrier mobility in pristine polymers, attributed to energetic relaxation within the density of states. Conversely, in solar cell blends, the presence or absence of such energetic relaxation on transport timescales remains under debate. We developed a complete numerical model and performed photo-CELIV experiments on the model high efficiency organic solar cell blend poly[3,6-dithiophene-2-yl-2,5-di(2-octyldodecyl)-pyrrolo[3,4-c]pyrrole-1,4-dione-alt-naphthalene] (PDPP-TNT):[6,6]-phenyl-C71-butyric-acid-methyl-ester (PC70BM). In the studied solar cells a constant, time-independent mobility on the scale relevant to charge extraction was observed, where thermalisation of photocarriers occurs on time scales much shorter than the transit time. Therefore, photocarrier relaxation effects are insignificant for charge transport in these efficient photovoltaic devices.

Item ID: 37935
Item Type: Article (Refereed Research - C1)
Keywords: photo-CELIV, organic solar cells, charge transport
ISSN: 1878-5530
Funders: Australian Research Council (ARC), Queensland Government
Date Deposited: 17 Mar 2015 16:43
FoR Codes: 09 ENGINEERING > 0906 Electrical and Electronic Engineering > 090605 Photodetectors, Optical Sensors and Solar Cells @ 50%
02 PHYSICAL SCIENCES > 0204 Condensed Matter Physics > 020404 Electronic and Magnetic Properties of Condensed Matter; Superconductivity @ 50%
SEO Codes: 85 ENERGY > 8505 Renewable Energy > 850504 Solar-Photovoltaic Energy @ 50%
97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 50%
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