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CMP
Credit: Jack Hobhouse

Dr Pascal Kaienburg

Postdoctoral Research Fellow

Sub department

  • Condensed Matter Physics

Research groups

  • Advanced Functional Materials and Devices (AFMD) Group
pascal.kaienburg@physics.ox.ac.uk
Telephone: 01865282330
Robert Hooke Building, room G29
  • About
  • Publications

Figures of Merit Guiding Research on Organic Solar Cells

JOURNAL OF PHYSICAL CHEMISTRY C 122:11 (2018) 5829-5843

Authors:

Thomas Kirchartz, Pascal Kaienburg, Derya Baran
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Reduced voltage losses yield 10% efficient fullerene free organic solar cells with >1 V open circuit voltages

Energy and Environmental Science Royal Society of Chemistry 9:12 (2016) 3783-3793

Authors:

D Baran, T Kirchartz, Scot Wheeler, S Dimitrov, M Abdelsamie, J Gorman, RS Ashraf, S Holliday, A Wadsworth, N Gasparini, P Kaienburg, H Yan, A Amassian, CJ Brabec, I McCulloch

Abstract:

Optimization of the energy levels at the donor–acceptor interface of organic solar cells has driven their efficiencies to above 10%. However, further improvements towards efficiencies comparable with inorganic solar cells remain challenging because of high recombination losses, which empirically limit the open-circuit voltage (Voc) to typically less than 1 V. Here we show that this empirical limit can be overcome using non-fullerene acceptors blended with the low band gap polymer PffBT4T-2DT leading to efficiencies approaching 10% (9.95%). We achieve Voc up to 1.12 V, which corresponds to a loss of only Eg/q − Voc = 0.5 ± 0.01 V between the optical bandgap Eg of the polymer and Voc. This high Voc is shown to be associated with the achievement of remarkably low non-geminate and non-radiative recombination losses in these devices. Suppression of non-radiative recombination implies high external electroluminescence quantum efficiencies which are orders of magnitude higher than those of equivalent devices employing fullerene acceptors. Using the balance between reduced recombination losses and good photocurrent generation efficiencies achieved experimentally as a baseline for simulations of the efficiency potential of organic solar cells, we estimate that efficiencies of up to 20% are achievable if band gaps and fill factors are further optimized.

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Extracting Information about the Electronic Quality of Organic Solar-Cell Absorbers from Fill Factor and Thickness

PHYSICAL REVIEW APPLIED 6:2 (2016) ARTN 024001

Authors:

Pascal Kaienburg, Uwe Rau, Thomas Kirchartz
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Low-temperature compatible electrostatic combdrive actuators with integrated graphene

Institute of Electrical and Electronics Engineers (IEEE) (2014) 251-255

Authors:

Matthias Goldsche, Tymofiy Khodkov, Pascal Kaienburg, Christoph Neumann, Christoph Stampfer, Matthias Goldsche, Stefan Trellenkamp, Gregor Mussler, Christoph Stampfer
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Limiting factors for charge generation in low-offset fullerene-based organic solar cells

Authors:

Anna Jungbluth, Eunkyung Cho, Alberto Privitera, Pascal Kaienburg, Andreas Lauritzen, Thomas Derrien, Sameer Kesava, Irfan Habib, Veaceslav Coropceanu, Jean-Luc Bredas, Moritz Riede
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