Applications brief: Touching is believing: Interrogating halide perovskite solar cells at the nanoscale via scanning probe microscopy

Key results


  • Halide perovskite solar cells are an exciting development in the next generation photovoltaic technologies
  • There is need for a method to investigate the local photovoltaic properties of halide perovskite solar cells that can be directly traced to their microstructures and device performance
  • AFM-IR has great potential to realize such promises at the nanoscale, and highlight some of the recent progresses and challenges along this line of investigation toward local probing of photocurrent, work function, ionic activities, polarization switching, and chemical degradation

Key words

photovoltaics | solar cells | halide perovskite | scanning probe microscopy

Authors

J. Li, B. Huang, E.N. Esfahani, L. Wei, J. Yao, J. Zhao, W. Chen

Abstract

Halide perovskite solar cells based on CH3NH3PbI3 and related materials have emerged as the most exciting development in the next generation photovoltaic technologies, yet the microscopi phenomena involving photo-carriers, ionic defects, spontaneous polarization, and molecular vibration and rotation interacting with numerous grains, grain boundaries, and interfaces are still inadequately understood. In fact, there is still need for an effective method to interrogate the local photovoltaic properties of halide perovskite solar cells that can be directly traced to their microstructures on one hand and linked to their device performance on the other hand. In this perspective, we propose that scanning probe microscopy (SPM) techniques have great potential to realize such promises at the nanoscale, and highlight some of the recent progresses and challenges along this line of investigation toward local probing of photocurrent, work function, ionic activities, polarization switching, and chemical degradation. We also emphasize the importance of multi-modality imaging, in-operando scanning, big data analysis, and multidisciplinary collaboration for further studies toward fully understanding of these complex systems.

 


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Chemical heterogeneity of CH3NH3PbI3 on FTO/PEDOTS:PSS revealed by AFM-IR. Chemical mapping of fresh (d) and degraded (e) sample at 1464cm-1
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