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Herz Group

Prof Laura Herz FRS

Professor of Physics

Sub department

  • Condensed Matter Physics

Research groups

  • Semiconductors group
  • Advanced Device Concepts for Next-Generation Photovoltaics
Laura.Herz@physics.ox.ac.uk
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Publons/WoS
  • About
  • Publications

The Role of the Organic Cation in Developing Efficient Green Perovskite LEDs Based on Quasi‐2D Perovskite Heterostructures

Advanced Functional Materials Wiley 34:14 (2024)

Authors:

Alexandra J Ramadan, Woo Hyeon Jeong, Robert DJ Oliver, Junke Jiang, Akash Dasgupta, Zhongcheng Yuan, Joel Smith, Jae Eun Lee, Silvia G Motti, Olivia Gough, Zhenlong Li, Laura M Herz, Michael B Johnston, Hyosung Choi, Jacky Even, Claudine Katan, Bo Ram Lee, Henry J Snaith
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Charting the irreversible degradation modes of low bandgap Pb-Sn perovskite compositions for de-risking practical industrial development

Advanced Energy Materials Wiley 14:10 (2024) 2302916

Authors:

Christina Kamaraki, Matthew T Klug, Vincent J‐Y Lim, Nourdine Zibouche, Laura M Herz, M Saiful Islam, Christopher Case, Laura Miranda Perez

Abstract:

The commercialization of a solar technology necessitates the fulfillment of specific requirements both regarding efficiency and stability to enter and gain space in the photovoltaic market. These aims are heavily dependent on the selection of suitable materials, which is critical for suppressing any reliability risks arising from inherent instabilities. Focusing on the absorber material, herein the most suitable low bandgap lead-tin composition candidate for all-perovskite tandem applications is investigated by studying their degradation mechanisms with both widely available and advanced characterization techniques. Three irreversible degradation processes are identified in narrow bandgap Pb-Sn perovskite absorbers: 1) Tin (Sn) oxidation upon air exposure, 2) methylammonium (MA) loss upon heat exposure, and 3) formamidinium (FA) and cesium (Cs) segregation leading to impurity phase formation. From an industrial perspective, it is proposed to refocus attention on FASn0.5Pb0.5I3 which minimizes all three effects while maintaining a suitable bandgap for a bottom cell and good performance. Moreover, a practical and highly sensitive characterization method is proposed to monitor the oxidation, which can be deployed both in laboratory and industrial environments and provide useful information for the technological development process, including, the effectiveness of encapsulation methods, and the acceptable time windows for air exposure.

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Compositional Transformation and Impurity‐Mediated Optical Transitions in Co‐Evaporated Cu2AgBiI6 Thin Films for Photovoltaic Applications

Advanced Energy Materials Wiley 14:8 (2024)

Authors:

Benjamin WJ Putland, Marcello Righetto, Heon Jin, Markus Fischer, Alexandra J Ramadan, Karl‐Augustin Zaininger, Laura M Herz, Harry C Sansom, Henry J Snaith
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Trace Water in Lead Iodide Affecting Perovskite Crystal Nucleation Limits the Performance of Perovskite Solar Cells

Advanced Materials Wiley 36:7 (2024) e2310237

Authors:

Renjun Guo, Qiu Xiong, Aleksander Ulatowski, Saisai Li, Zijin Ding, Tianxiao Xiao, Suzhe Liang, Julian E Heger, Tianfu Guan, Xinyu Jiang, Kun Sun, Lennart K Reb, Manuel A Reus, Andrei Chumakov, Matthias Schwartzkopf, Minjian Yuan, Yi Hou, Stephan V Roth, Laura M Herz, Peng Gao, Peter Müller‐Buschbaum
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In-situ nanoscopy of carrier dynamics and nanomorphology in metal halide perovskites

Institute of Electrical and Electronics Engineers (IEEE) 00 (2024) 1-2

Authors:

M Zizlsperger, S Nerreter, Q Yuan, KB Lohmann, F Sandner, F Schiegl, C Meineke, Y Gerasimenko, LM Herz, T Siday, MA Huber, MB Johnston, R Huber
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