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Optoelectronic Materials and Device Spectroscopy Group (StranksLab)

Our research focuses on the optical and electronic properties of emerging semiconductors for low-cost, transformative electronics applications including photovoltaics for energy, LEDs for lighting and X-ray detectors for medical imaging. We use optical spectroscopy to understand material and device photophysics on a range of length and time scales, and relate these characteristics directly to local chemical, structural and morphological properties through multimodal measurements. This provides a unique platform to discover new semiconducting materials, unveil power loss mechanisms in devices, guide innovative device designs, and push device performance to the limits. Our developed devices and in-situ and operando imaging approaches are applicable to a range of fields including energy materials, medical imaging and biological systems. We also have a strong emphasis in the group on making our work accessible to the public through a number of outreach and media activities, and on equality, diversity and inclusion efforts.


  • Pan, L.; Dai, L.; Burton, O. J.; Chen, L.; Andrei, V.; Zhang, Y.; Ren, D.; Cheng, J.; Wu, L.; Frohna, K.; Abfalterer, A.; Yang, T. C-J.; Niu, W.; Xia, M.; Hofmann, S.; Dyson, P. J.; Reisner, E.; Sirringhaus, H.; *Luo, J.; *Hagfeldt, A.; *Grätzel, M.; *Stranks, S. D.; High carrier mobility along the [111] orientation in Cu2O photoelectrodes Nature 2024, In Press, DOI:10.1038/s41586-024-07273-8
  • Ji, K.; Lin, W.; Sun, Y.; Cui, L.; Shamsi, J.; Chiang, Y-H.; Chen, J.; Tennyson, E. M.; Dai, L.; Li, Q.; Frohna, K.; Anaya, M.; Greenham, N. C.; *Stranks, S. D. Self-supervised Deep Learning for Tracking Degradation of Perovskite LEDs with Multispectral Imaging Nature Machine Intelligence 2023, 5, 1225–1235
  • *Senanayak, S.P.; Dey, K.; Shivanna, R.; Li, W.; Ghosh, D.; Zhang, Y.; Roose, B.; Zelewski, S. J.; Andaji-Garmaroudi, Z.; Wood, W.; Tiwale, N.; MacManus-Driscoll, J. L.; Friend, R. H.; *Stranks, S. D.; *Sirringhaus, H. Charge transport in mixed metal halide perovskite semiconductors. Nature Materials 2023, 22, 216–224 
  • Cho, C.; Feldmann, S.; Yeom, K. M.; Jang, Y-W.; Kahmann, S.; Huang, J-Y.; Yang, T. C-J.; Khayyat, M. N. T.; Wu, Y-R.; Choi, M.; Noh, J. H.; Stranks, S.; *Greenham, N. C. Efficient vertical charge transport in polycrystalline halide perovskites revealed by four-dimensional tracking of charge carriers. Nature Materials 2022, 211388–1395
  • Macpherson, S.; Doherty, T. A. S.; Winchester, A. J.; Kosar, S.; Johnstone, D. N.; Chiang, Y.-H.; Galkowski, K.; Anaya, M.; Frohna, K.; Iqbal, A. N.; Nagane, S.; Roose, B.; Andaji-Garmaroudi, Z.; Orr, K. W. P.; Parker, J. E.; Midgley, P. A.; *Dani, K. M.; *Stranks, S. D. Local nanoscale phase impurities are degradation sites in halide perovskites Nature 2022, 607, 294-300
  • Frohna, K.; *Anaya, M.; Macpherson, S.; Sung, J.; Doherty, T. A. S.; Chiang, Y.-H.; Winchester, A. J.; Orr, K. W. P.; Parker, J. E.; Quinn, P. D.; Dani, K. M.; Rao, A.; *Stranks, S. D. Nanoscale chemical heterogeneity dominates the optoelectronic response of alloyed perovskite solar cells Nature Nanotechnology 2022, 17, 190–196
  • Doherty, T. A. S.; Nagane, S.; Kubicki, D. J.; Jung, Y.-K.; Johnstone, D. N. ; Iqbal, A. N.; Guo, D.; Frohna, K.; Danaie, M.; Tennyson, E. M.; Macpherson, S.; Abfalterer, A.; Anaya, M.; Chiang, Y.-H.; Crout, P.; Ruggeri, F. S.; Collins, S.; Grey, C. P.; Walsh, A.; Midgley, P. A.; *Stranks, S. D. Stabilized tilted-octahedra halide perovskites inhibit local formation of performance-limiting phases Science 2021, 374(6575), 1598-1605
  • Liu, D.; Luo, D.; Iqbal, A.N.; Orr, K.W.P.; Doherty, T.A.S.; Lu, Z.; *Stranks, S.D.; *Zhang, W. Strain analysis and engineering in halide perovskite photovoltaics Nature Materials 2021, DOI: 10.1038/s41563-021-01097-x
  • Kubicki, D.J.; *Stranks, S.D.; *Grey, C.P.; *Emsley, L. NMR spectroscopy probes microstructure, dynamics and doping of metal halide perovskites Nature Reviews Chemistry 2021, DOI: 10.1038/s41570-021-00309-x




We acknowledge generous support from the European Research Council (HYPERION), the Royal Society, the Engineering and Physical Sciences Research Council, the Faraday Institute, the Leverhulme Trust and the European Commission.