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CMP
Credit: Jack Hobhouse

Jarla Thiesbrummel

Visitor

Research theme

  • Photovoltaics and nanoscience

Sub department

  • Condensed Matter Physics
jarla.thiesbrummel@physics.ox.ac.uk
Robert Hooke Building, room G29
My personal website
  • About
  • Publications

Determination of Mobile Ion Densities in Halide Perovskites via Low-Frequency Capacitance and Charge Extraction Techniques

The Journal of Physical Chemistry Letters American Chemical Society (ACS) 14:18 (2023) 4200-4210

Authors:

Jonas Diekmann, Francisco Peña-Camargo, Nurlan Tokmoldin, Jarla Thiesbrummel, Jonathan Warby, Emilio Gutierrez-Partida, Sahil Shah, Dieter Neher, Martin Stolterfoht
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Rubidium Iodide Reduces Recombination Losses in Methylammonium‐Free Tin‐Lead Perovskite Solar Cells

Advanced Energy Materials Wiley 13:19 (2023)

Authors:

Fengjiu Yang, Rowan W MacQueen, Dorothee Menzel, Artem Musiienko, Amran Al‐Ashouri, Jarla Thiesbrummel, Sahil Shah, Karunanantharajah Prashanthan, Daniel Abou‐Ras, Lars Korte, Martin Stolterfoht, Dieter Neher, Igal Levine, Henry Snaith, Steve Albrecht
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Open-circuit and short-circuit loss management in wide-gap perovskite p-i-n solar cells

Nature communications Springer Nature 14:1 (2023) 932

Authors:

Pietro Caprioglio, Joel A Smith, Robert DJ Oliver, Akash Dasgupta, Saqlain Choudhary, Michael D Farrar, Alexandra J Ramadan, Yen-Hung Lin, M Greyson Christoforo, James M Ball, Jonas Diekmann, Jarla Thiesbrummel, Karl-Augustin Zaininger, Xinyi Shen, Michael B Johnston, Dieter Neher, Martin Stolterfoht, Henry J Snaith

Abstract:

In this work, we couple theoretical and experimental approaches to understand and reduce the losses of wide bandgap Br-rich perovskite pin devices at open-circuit voltage (VOC) and short-circuit current (JSC) conditions. A mismatch between the internal quasi-Fermi level splitting (QFLS) and the external VOC is detrimental for these devices. We demonstrate that modifying the perovskite top-surface with guanidinium-Br and imidazolium-Br forms a low-dimensional perovskite phase at the n-interface, suppressing the QFLS-VOC mismatch, and boosting the VOC. Concurrently, the use of an ionic interlayer or a self-assembled monolayer at the p-interface reduces the inferred field screening induced by mobile ions at JSC, promoting charge extraction and raising the JSC. The combination of the n- and p-type optimizations allows us to approach the thermodynamic potential of the perovskite absorber layer, resulting in 1 cm2 devices with performance parameters of VOCs up to 1.29 V, fill factors above 80% and JSCs up to 17 mA/cm2, in addition to a thermal stability T80 lifetime of more than 3500 h at 85 °C.

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Understanding and Minimizing VOC Losses in All‐Perovskite Tandem Photovoltaics

Advanced Energy Materials Wiley 13:3 (2023)

Authors:

Jarla Thiesbrummel, Francisco Peña‐Camargo, Kai Oliver Brinkmann, Emilio Gutierrez‐Partida, Fengjiu Yang, Jonathan Warby, Steve Albrecht, Dieter Neher, Thomas Riedl, Henry J Snaith, Martin Stolterfoht, Felix Lang
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High‐Performance Flexible All‐Perovskite Tandem Solar Cells with Reduced VOC‐Deficit in Wide‐Bandgap Subcell

Advanced Energy Materials Wiley 12:45 (2022)

Authors:

Huagui Lai, Jincheng Luo, Yannick Zwirner, Selina Olthof, Alexander Wieczorek, Fangyuan Ye, Quentin Jeangros, Xinxing Yin, Fatima Akhundova, Tianshu Ma, Rui He, Radha K Kothandaraman, Xinyu Chin, Evgeniia Gilshtein, André Müller, Changlei Wang, Jarla Thiesbrummel, Sebastian Siol, José Márquez Prieto, Thomas Unold, Martin Stolterfoht, Cong Chen, Ayodhya N Tiwari, Dewei Zhao, Fan Fu
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