Charge transport without recombination in organic solar cells and photodiodes

M. Stolterfoht; B. Philippa; S. Shoaee; H. Jin; W. Jiang; R.D. White; P.L. Burn; P. Meredith; A. Pivrikas

doi:10.1021/acs.jpcc.5b09058

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Charge transport without recombination in organic solar cells and photodiodes

Journal article

Peer reviewed

Charge transport without recombination in organic solar cells and photodiodes

M. Stolterfoht, B. Philippa, S. Shoaee, H. Jin, W. Jiang, R.D. White, P.L. Burn, P. Meredith and A. Pivrikas

The Journal of Physical Chemistry C, Vol.119(48), pp.26866-26874

2015

DOI: https://doi.org/10.1021/acs.jpcc.5b09058

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Abstract

Decoupling charge generation and extraction is critical to understanding loss mechanisms in polymer:fullerene organic solar cells and photodiodes but has thus far proven to be a challenging task. Using steady-state and time-resolved light intensity dependent photocurrent (iPC) measurements in combination with transient photovoltage, we estimate the total charge inside a typical device during steady-state photoconduction, which is defined by the trapped, doping-induced, and mobile charge populations. Our results show that nongeminate recombination of any order can be avoided as long as this charge is much less than that capable of being stored on the electrodes—a criterion that is typically met in the linear iPC regime in donor:fullerene systems even with low, imbalanced mobilities. Knowing the conditions under which nongeminate recombination is essentially absent is an important device and materials design consideration. Our work also demonstrates that the technique of iPC is not only useful to assess the charge extraction efficiency but can also be used to estimate the efficiency of free carrier generation in fully operational devices.

Details

Title: Charge transport without recombination in organic solar cells and photodiodes
Authors/Creators: M. Stolterfoht (Author/Creator) - The University of Queensland
B. Philippa (Author/Creator) - James Cook University
S. Shoaee (Author/Creator) - The University of Queensland
H. Jin (Author/Creator)
W. Jiang (Author/Creator) - The University of Queensland
R.D. White (Author/Creator) - James Cook University
P.L. Burn (Author/Creator) - The University of Queensland
P. Meredith (Author/Creator) - The University of Queensland
A. Pivrikas (Author/Creator) - Murdoch University
Publication Details: The Journal of Physical Chemistry C, Vol.119(48), pp.26866-26874
Publisher: American Chemical Society
Identifiers: 991005543483607891
Copyright: © 2015 American Chemical Society
Murdoch Affiliation: School of Engineering and Information Technology
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration
Citation topics: 2 Chemistry; 2.114 Organic Semiconductors; 2.114.61 Organic Solar Cells
Web Of Science research areas: Chemistry, Physical; Materials Science, Multidisciplinary; Nanoscience & Nanotechnology
ESI research areas: Chemistry