4.5 Article

Quantitative investigation of polarization-dependent photocurrent in ferroelectric thin films

期刊

JOURNAL OF PHYSICS-CONDENSED MATTER
卷 34, 期 10, 页码 -

出版社

IOP Publishing Ltd
DOI: 10.1088/1361-648X/ac3f67

关键词

ferroelectric; thin film; photocurrent

资金

  1. French RENATECH network
  2. French National Research Agency (ANR) - Project UP-DOWN [ANR-18-CE09-0026-04]
  3. Agence Nationale de la Recherche (ANR) [ANR-18-CE09-0026] Funding Source: Agence Nationale de la Recherche (ANR)

向作者/读者索取更多资源

In this study, the polarization-dependent photocurrent of epitaxial Pb(Zr, Ti)O-3 thin films has been carefully investigated, and a quantitative determination of the unswitchable part of ferroelectric polarization has been provided. This research approach can be used to optimize the switchability of photocurrent and provides important insights into the ferroelectric behavior of various types of ferroelectric layers in which pinned polarization is difficult to investigate.
Ferroelectric thin films are investigated for their potential in photovoltaic (PV) applications, owing to their high open-circuit voltage and switchable photovoltaic effect. The direction of the ferroelectric polarization can control the sign of the photocurrent through the ferroelectric layer, theoretically allowing for 100% switchability of the photocurrent with the polarization, which is particularly interesting for photo-ferroelectric memories. However, the quantitative relationship between photocurrent and polarization remains little studied. In this work, a careful investigation of the polarization-dependent photocurrent of epitaxial Pb(Zr, Ti)O-3 thin films has been carried out, and has provided a quantitative determination of the unswitchable part of ferroelectric polarization. These results represent a systematic approach to study and optimize the switchability of photocurrent, and more broadly to get important insights on the ferroelectric behavior in all types of ferroelectric layers in which pinned polarization is difficult to investigate.

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