Ionic-Defect Distribution Revealed by Improved Evaluation of Deep-Level Transient Spectroscopy on Perovskite Solar Cells

Sebastian Reichert, Jens Flemming, Qingzhi An, Yana Vaynzof, Jan-Frederik Pietschmann, and Carsten Deibel
Phys. Rev. Applied 13, 034018 – Published 6 March 2020
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Abstract

One of the key challenges for the future development of efficient and stable metal-halide perovskite solar cells is related to the migration of ions in these materials. Mobile ions have been linked to the observation of hysteresis in the current-voltage characteristics, shown to reduce device stability against degradation and act as recombination centers within the band gap of the active layer. In the literature, one finds a broad spread of reported ionic defect parameters (e.g., activation energies) for seemingly similar perovskite materials, rendering the identification of the nature of these species difficult. In this work, we perform temperature-dependent deep-level transient spectroscopy (DLTS) measurements on methylammonium-lead-iodide perovskite solar cells and develop a extended regularization algorithm for inverting the Laplace transform. Our results indicate that mobile ions form a distribution of emission rates (i.e., a distribution of diffusion constants) for each observed ionic species, which may be responsible for the differences in the previously reported defect parameters. Importantly, different DLTS modes such as optical and current DLTS yield the same defect distributions. Finally, the comparison of our results with conventional boxcar DLTS and impedance spectroscopy verifies our evaluation algorithm.

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  • Received 15 October 2019
  • Revised 19 December 2019
  • Accepted 17 January 2020

DOI:https://doi.org/10.1103/PhysRevApplied.13.034018

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Sebastian Reichert1,*, Jens Flemming2, Qingzhi An3,4, Yana Vaynzof3,4, Jan-Frederik Pietschmann2, and Carsten Deibel1,†

  • 1Institut für Physik, Technische Universität Chemnitz, Chemnitz 09126, Germany
  • 2Fakultät für Mathematik, Technische Universität Chemnitz, Chemnitz 09126, Germany
  • 3Kirchhoff-Institut für Physik and Center for Advanced Materials, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 227, Heidelberg 69120, Germany
  • 4Technische Universität Dresden, Institut für Angewandte Physik and Center for Advancing Electronics Dresden (cfaed), Nöthnitzer Straße 61, Dresden 01069, Germany

  • *sebastian.reichert@physik.tu-chemnitz.de
  • deibel@physik.tu-chemnitz.de

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Issue

Vol. 13, Iss. 3 — March 2020

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