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Wavelength-Dependent Charge Carrier Dynamics for Single Pixel Color Sensing Using Graded Perovskite Structures.

N Ganesh1, Ravichandran Shivanna2, Richard H Friend2

  • 1Chemistry and Physics of Materials Unit , Jawaharlal Nehru Center for Advanced Scientific Research , Jakkur, Bengaluru 560064 , India.

Nano Letters
|August 27, 2019
PubMed
Summary
This summary is machine-generated.

We developed novel color-sensing devices using graded band gap perovskite films. These devices show unique photocurrent responses to different light wavelengths, enabling spectral purity analysis.

Keywords:
Graded bandgap hybrid organic−inorganic perovskiteoff-cycle responseoptical time division multiplexingtransient photocurrent

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Solid-State Physics

Background:

  • Two-dimensional (2D) lead halide perovskites are promising materials for optoelectronic devices.
  • Controlling material properties like band gap is crucial for device functionality.
  • Graded band gap structures offer unique optical and electronic properties.

Purpose of the Study:

  • To report smart color-sensing devices based on 2D lead halide perovskites with a graded band gap.
  • To investigate the wavelength-dependent photocurrent response of these devices.
  • To explore the potential of these devices for spectral purity analysis.

Main Methods:

  • Fabrication of 2D lead halide perovskite films with a graded band gap.
  • Measurement of device short-circuit photocurrent under varying excitation wavelengths (λ).
  • Analysis of steady-state and transient photocurrent responses.
  • Application of an equivalent circuit model for physical interpretation.

Main Results:

  • Device photocurrent strongly depends on excitation wavelength due to depth-dependent photoabsorption.
  • A complete reversal in photocurrent polarity is observed across the visible spectrum when light is incident from the high band gap side.
  • Transient photocurrent exhibits wavelength-specific components (positive and negative).

Conclusions:

  • The unique wavelength-dependent photocurrent signature is a direct result of the graded band gap.
  • This phenomenon can be exploited for spectral purity examination without dispersive optical elements.
  • An equivalent circuit model provides insights into the underlying physical mechanisms.