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One of the substrate layouts for our organic solar cells
Credit: AFMD Group

Moritz Riede

Professor of Soft Functional Nanomaterials

Research theme

  • Photovoltaics and nanoscience

Sub department

  • Condensed Matter Physics

Research groups

  • Advanced Functional Materials and Devices (AFMD) Group
moritz.riede@physics.ox.ac.uk
Telephone: 01865 (2)72377 (office),01865 (2)82095 (lab)
  • About
  • Research
  • Teaching
  • Publications

The crystal packing of non-fullerene acceptors in organic solar cells

SPIE, the international society for optics and photonics (2022) 27

Authors:

Pierluigi Mondelli, Pascal Kaienburg, Francesco Silvestri, Eduardo Solano, Esther Barrena, Moritz Riede, Graham Morse
More details from the publisher

All-Small-Molecule Organic Solar Cells – Performance, Electronic & Microstructure Properties

Fundacio Scito (2022)

Authors:

Pascal Kaienburg, Moritz Riede
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Improving performance of fully scalable, flexible transparent conductive films made from carbon nanotubes and ethylene-vinyl acetate

Energy Reports Elsevier 8:S11 (2022) 48-60

Authors:

Bernd K Sturdza, Andreas E Lauritzen, Suer Zhou, Andre J Bennett, Joshua Form, M Greyson Christoforo, Robert M Dalgliesh, Henry J Snaith, Moritz K Riede, Robin J Nicholas

Abstract:

We report process improvements for the fabrication of single-walled carbon nanotube ethylene-vinyl acetate transparent conductive films. CNT:EVA films demonstrate high resilience against folding and can replace the external dopant in a spiro-OMeTAD based hole selective contact of n-i-p perovskite solar cells achieving a steady-state efficiency of 16.3%. The adapted process is fully scalable, and compared to previous reports (Mazzotta et al., 2018) lowers the material cost dramatically and improves DC to optical conductivity ratio by two orders of magnitude to σdc/σop = 3.6 for pristine and σdc/σop = 15 for chemically doped films. We analyse the microstructure of our films via small angle neutron scattering and find a positive correlation between the long range packing density of the CNT:EVA films and the σdc/σop performance. Increasing monomer ratio and chain length of the EVA polymer improves resilience against bending strain, whereas no significant effect on the CNT wrapping and electrical conductivity of resulting films is found.
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Geminate and Nongeminate Pathways for Triplet Exciton Formation in Organic Solar Cells

Advanced Energy Materials Wiley (2022) 2103944-2103944

Authors:

Alberto Privitera, Jeannine Grüne, Akchheta Karki, William K Myers, Vladimir Dyakonov, Thuc‐Quyen Nguyen, Moritz K Riede, Richard H Friend, Andreas Sperlich, Alexander J Gillett
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Interfacial rearrangements and strain evolution in the thin film growth of ZnPc on glass

Physical Review Materials American Physical Society 6:3 (2022) 33401

Authors:

Thomas L Derrien, Andreas E Lauritzen, Pascal Kaienburg, Ellis Hancox, Chris Nicklin, Moritz Riede

Abstract:

We report on the characterization of the growth of vacuum-deposited zinc phthalocyanine (ZnPc) thin films on glass through a combination of in situ grazing incidence x-ray scattering, x-ray reflectivity, and atomic force microscopy. We found that the growth at room temperature proceeds via the formation of two structurally unique substrate-induced interfacial layers, followed by the growth of the γ -ZnPc polymorph thereafter (thickness ≈ 1.0 nm). As the growth of the bulk γ -ZnPc progresses, a substantial out-of-plane lattice strain ( ≈ 15 % relative to γ -ZnPc powder) is continually relaxed during the thin film growth. The rate of strain relaxation was slowed after a thickness of ≈ 13 nm, corresponding to the transition from layer growth to island growth. The findings reveal the real-time microstructural evolution of ZnPc and highlight the importance of substrate-induced strain on thin film growth.
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