Imaging the Anomalous Charge Distribution Inside CsPbBr3 Perovskite Quantum Dots Sensitized Solar Cells

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Highly luminescent CsPbBr3 perovskite quantum dots (QDs) have gained huge attention in research due to their various applications in optoelectronics, including as a light absorber in photovoltaic solar cells. To improve the performances of such devices, it requires a deeper knowledge on the charge transport dynamics inside the solar cell, which are related to its power-conversion efficiency. Here, we report the successful fabrication of an all-inorganic CsPbBr3 perovskite QD sensitized solar cell and the imaging of anomalous electrical potential distribution across the layers of the cell under different illuminations using Kelvin probe force microscopy. Carrier generation, separation, and transport capacity inside the cells are dependent on the light illumination. Large differences in surface potential between electron and hole transport layers with unbalanced carrier separation at the junction have been observed under white light (full solar spectrum) illumination. However, under monochromatic light (single wavelength of solar spectrum) illumination, poor charge transport occurred across the junction as a consequence of less difference in surface potential between the active layers. The outcome of this study provides a clear idea on the carrier dynamic processes inside the cells and corresponding surface potential across the layers under the illumination of different wavelengths of light to understand the functioning of the solar cells and ultimately for the improvement of their photovoltaic performances.

Original languageEnglish
Pages (from-to)10214-10221
Number of pages8
JournalACS Nano
Volume11
Issue number10
DOIs
Publication statusPublished - 24 Oct 2017

Fingerprint

Charge distribution
Perovskite
charge distribution
Semiconductor quantum dots
Solar cells
solar cells
Lighting
illumination
quantum dots
Imaging techniques
Surface potential
solar spectra
Charge transfer
cells
Wavelength
wavelengths
Optoelectronic devices
Conversion efficiency
absorbers
Microscopic examination

Keywords

  • charge carrier dynamics
  • CsPbBr QDs
  • Kelvin probe force microscopy
  • light illumination
  • perovskite solar cell
  • surface potential

Cite this

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title = "Imaging the Anomalous Charge Distribution Inside CsPbBr3 Perovskite Quantum Dots Sensitized Solar Cells",
abstract = "Highly luminescent CsPbBr3 perovskite quantum dots (QDs) have gained huge attention in research due to their various applications in optoelectronics, including as a light absorber in photovoltaic solar cells. To improve the performances of such devices, it requires a deeper knowledge on the charge transport dynamics inside the solar cell, which are related to its power-conversion efficiency. Here, we report the successful fabrication of an all-inorganic CsPbBr3 perovskite QD sensitized solar cell and the imaging of anomalous electrical potential distribution across the layers of the cell under different illuminations using Kelvin probe force microscopy. Carrier generation, separation, and transport capacity inside the cells are dependent on the light illumination. Large differences in surface potential between electron and hole transport layers with unbalanced carrier separation at the junction have been observed under white light (full solar spectrum) illumination. However, under monochromatic light (single wavelength of solar spectrum) illumination, poor charge transport occurred across the junction as a consequence of less difference in surface potential between the active layers. The outcome of this study provides a clear idea on the carrier dynamic processes inside the cells and corresponding surface potential across the layers under the illumination of different wavelengths of light to understand the functioning of the solar cells and ultimately for the improvement of their photovoltaic performances.",
keywords = "charge carrier dynamics, CsPbBr QDs, Kelvin probe force microscopy, light illumination, perovskite solar cell, surface potential",
author = "Shrabani Panigrahi and Santanu Jana and Tom{\'a}s Calmeiro and Daniela Nunes and Rodrigo Martins and Elvira Fortunato",
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Imaging the Anomalous Charge Distribution Inside CsPbBr3 Perovskite Quantum Dots Sensitized Solar Cells. / Panigrahi, Shrabani; Jana, Santanu; Calmeiro, Tomás; Nunes, Daniela; Martins, Rodrigo; Fortunato, Elvira.

In: ACS Nano, Vol. 11, No. 10, 24.10.2017, p. 10214-10221.

Research output: Contribution to journalArticle

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