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Photoinduced currents in PZT thin films.

M A Butler, S J Martin, C E Land

|June 18, 2010

Summary

This summary is machine-generated.

Photoinduced currents in lead zirconate titanate (PZT) films show an exponential relationship with photon energy, influenced by film interference. Carrier transport is hindered by traps, limiting overall efficiency in these semiconductor devices.

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Area of Science:

Materials Science
Solid State Physics
Photovoltaics

Background:

Ferroelectric PZT films are investigated for their potential optoelectronic properties.
Understanding photoresponse is crucial for developing novel electronic devices.

Purpose of the Study:

To measure and analyze photoinduced currents in PZT films.
To investigate the influence of wavelength and poling direction on photocurrent.
To understand carrier transport mechanisms and collection efficiency.

Main Methods:

Fabrication of 0.5-microm thick PZT films on platinum electrodes.
Measurement of photoinduced currents as a function of wavelength and poling direction.
Utilized aluminum or gold semitransparent top electrodes.
Analysis of photocurrent dependence on photon energy and interference effects.

Main Results:

Photocurrents exhibit an Urbach-like, exponential dependence on photon energy.
Observed interference effects within the PZT films impact photocurrent.
Carrier transport is significantly influenced by trapping phenomena.
Overall photoexcited carrier collection efficiency was found to be low.

Conclusions:

The photoresponse of PZT films is characterized by an exponential photon energy dependence and interference.
Trapping mechanisms dominate carrier transport, leading to reduced efficiency.
Further research is needed to enhance carrier collection in PZT-based optoelectronic devices.