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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
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  • About
  • Publications

Ion-induced field screening as a dominant factor in perovskite solar cell operational stability

Nature Energy Nature Research 9:6 (2024) 664-676

Authors:

Jarla Thiesbrummel, Sahil Shah, Emilio Gutierrez-Partida, Fengshuo Zu, Francisco Peña-Camargo, Stefan Zeiske, Jonas Diekmann, Fangyuan Ye, Karol P Peters, Kai O Brinkmann, Pietro Caprioglio, Akash Dasgupta, Seongrok Seo, Fatai A Adeleye, Jonathan Warby, Quentin Jeangros, Felix Lang, Shuo Zhang, Steve Albrecht, Thomas Riedl, Ardalan Armin, Dieter Neher, Norbert Koch, Yongzhen Wu, Henry Snaith

Abstract:

The presence of mobile ions in metal halide perovskites has been shown to adversely affect the intrinsic stability of perovskite solar cells (PSCs). However, the actual contribution of mobile ions to the total degradation loss compared with other factors such as trap-assisted recombination remains poorly understood. Here we reveal that mobile ion-induced internal field screening is the dominant factor in the degradation of PSCs under operational conditions. The increased field screening leads to a decrease in the steady-state efficiency, often owing to a large reduction in the current density. Instead, the efficiency at high scan speeds (>1,000 V s−1), where the ions are immobilized, is much less affected. We also show that the bulk and interface quality do not degrade upon ageing, yet the open-circuit voltage decreases owing to an increase in the mobile ion density. This work reveals the importance of ionic losses for intrinsic PSC degradation before chemical or extrinsic mechanical effects manifest.
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Improving interface quality for 1-cm2 all-perovskite tandem solar cells

Nature Springer Nature 618:7963 (2023) 80-86

Authors:

Rui He, Wanhai Wang, Zongjin Yi, Felix Lang, Cong Chen, Jincheng Luo, Jingwei Zhu, Jarla Thiesbrummel, Sahil Shah, Kun Wei, Yi Luo, Changlei Wang, Huagui Lai, Hao Huang, Jie Zhou, Bingsuo Zou, Xinxing Yin, Shengqiang Ren, Xia Hao, Lili Wu, Jingquan Zhang, Jinbao Zhang, Martin Stolterfoht, Fan Fu, Weihua Tang, Dewei Zhao
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Intensity-Modulated Photoluminescence Spectroscopy for Revealing Ionic Processes in Halide Perovskites

ACS Energy Letters American Chemical Society (ACS) 10:7 (2025) 3122-3131

Authors:

Sarah C Gillespie, Agustin O Alvarez, Jarla Thiesbrummel, Veronique S Gevaerts, LJ Geerligs, Bruno Ehrler, Gianluca Coletti, Erik C Garnett
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Impact of Ion Migration on the Performance and Stability of Perovskite‐Based Tandem Solar Cells

Advanced Energy Materials Wiley (2024) 2400720

Authors:

Sahil Shah, Fengjiu Yang, Eike Köhnen, Esma Ugur, Mark Khenkin, Jarla Thiesbrummel, Bor Li, Lucas Holte, Sebastian Berwig, Florian Scherler, Paria Forozi, Jonas Diekmann, Francisco Peña‐Camargo, Marko Remec, Nikhil Kalasariya, Erkan Aydin, Felix Lang, Henry Snaith, Dieter Neher, Stefaan De Wolf, Carolin Ulbrich, Steve Albrecht, Martin Stolterfoht

Abstract:

The stability of perovskite‐based tandem solar cells (TSCs) is the last major scientific/technical challenge to be overcome before commercialization. Understanding the impact of mobile ions on the TSC performance is key to minimizing degradation. Here, a comprehensive study that combines an experimental analysis of ionic losses in Si/perovskite and all‐perovskite TSCs using scan‐rate‐dependent current–voltage (J–V) measurements with drift‐diffusion simulations is presented. The findings demonstrate that mobile ions have a significant influence on the tandem cell performance lowering the ion‐freeze power conversion efficiency from >31% for Si/perovskite and >30% for all‐perovskite tandems to ≈28% in steady‐state. Moreover, the ions cause a substantial hysteresis in Si/perovskite TSCs at high scan speeds (400 s−1), and significantly influence the performance degradation of both devices through internal field screening. Additionally, for all‐perovskite tandems, subcell‐dominated J–V characterization reveals more pronounced ionic losses in the wide‐bandgap subcell during aging, which is attributed to its tendency for halide segregation. This work provides valuable insights into ionic losses in perovskite‐based TSCs which helps to separate ion migration‐related degradation modes from other degradation mechanisms and guides targeted interventions for enhanced subcell efficiency and stability.
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Roadmap on established and emerging photovoltaics for sustainable energy conversion

JPhys Energy IOP Publishing 6:4 (2024) 041501

Authors:

James C Blakesley, Ruy S Bonilla, Marina Freitag, Alex M Ganose, Nicola Gasparini, Pascal Kaienburg, George Koutsourakis, Jonathan D Major, Jenny Nelson, Nakita K Noel, Bart Roose, Jae Sung Yun, Simon Aliwell, Pietro P Altermatt, Tayebeh Ameri, Virgil Andrei, Ardalan Armin, Diego Bagnis, Jenny Baker, Hamish Beath, Mathieu Bellanger, Philippe Berrouard, Jochen Blumberger, Stuart A Boden, Marina R Filip, Elizabeth A Gibson, M Saiful Islam, Michael B Johnston

Abstract:

Photovoltaics (PVs) are a critical technology for curbing growing levels of anthropogenic greenhouse gas emissions, and meeting increases in future demand for low-carbon electricity. In order to fulfill ambitions for net-zero carbon dioxide equivalent (CO2eq) emissions worldwide, the global cumulative capacity of solar PVs must increase by an order of magnitude from 0.9 TWp in 2021 to 8.5 TWp by 2050 according to the International Renewable Energy Agency, which is considered to be a highly conservative estimate. In 2020, the Henry Royce Institute brought together the UK PV community to discuss the critical technological and infrastructure challenges that need to be overcome to address the vast challenges in accelerating PV deployment. Herein, we examine the key developments in the global community, especially the progress made in the field since this earlier roadmap, bringing together experts primarily from the UK across the breadth of the PVs community. The focus is both on the challenges in improving the efficiency, stability and levelized cost of electricity of current technologies for utility-scale PVs, as well as the fundamental questions in novel technologies that can have a significant impact on emerging markets, such as indoor PVs, space PVs, and agrivoltaics. We discuss challenges in advanced metrology and computational tools, as well as the growing synergies between PVs and solar fuels, and offer a perspective on the environmental sustainability of the PV industry. Through this roadmap, we emphasize promising pathways forward in both the short- and long-term, and for communities working on technologies across a range of maturity levels to learn from each other.
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