Enhanced light harvesting and charge recombination control with TiO2/PbCdS/CdS based quantum dot-sensitized solar cells

Hee Je Kim, Guo Cheng Xu, Chandu V.V.M. Gopi, Hyunwoong Seo, Mallineni Venkata-Haritha, Masaharu Shiratani

Research output: Contribution to journalArticle

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Abstract

Charge recombination is considered as one of the most significant factors in hindering the photovoltaic performance of quantum dot-sensitized solar cells (QDSSCs). In addition, expand the light absorption range to the near-infrared region in QDSSCs increasing the generated photocurrent. A significant enhancement in the power conversion efficiency (PCE) of QDSSCs has been obtained by charge recombination control and enhanced light harvesting. In this respect, PbCdS layer is introduced between TiO2 and CdS QDs via a facile successive ionic layer absorption and reaction (SILAR) method in order to further improve the cell performance. For the first time a photoanode assembly composed of TiO2/PbCdS/CdS was prepared in QDSSCs. The photovoltaic parameters were significantly enhanced with the incorporation of a PbCdS intermediate layer between TiO2 and CdS QDs but varied appreciably with the SILAR cycles of PbCdS. When four SILAR cycle layer was applied, the PCE is as high as 3.35%, which is higher than the efficiency of 1.84% for the solar cell without PbCdS layer. The improved performance of the TiO2/PbCdS/CdS-based QDSSCs was attributed to the PbCdS layer can enhance the light harvesting to release more excitons. In addition, the PbCdS layer accelerates the electron injection kinetics and also functioning as a blocking layer to cover the TiO2 core from the outer QDs and redox couple, thereby reducing the recombination of electrons from the TiO2 with the electrolyte or with the QDs. Electrochemical impedance measurements has been measured and discussed in detail providing a detailed analysis of charge transport processes in QDSSCs.

Original languageEnglish
Pages (from-to)131-136
Number of pages6
JournalJournal of Electroanalytical Chemistry
Volume788
DOIs
Publication statusPublished - Mar 1 2017

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Semiconductor quantum dots
Solar cells
Conversion efficiency
Electron injection
Photocurrents
Excitons
Light absorption
Electrolytes
Charge transfer
Infrared radiation
Kinetics
Electrons

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

Cite this

Enhanced light harvesting and charge recombination control with TiO2/PbCdS/CdS based quantum dot-sensitized solar cells. / Kim, Hee Je; Xu, Guo Cheng; Gopi, Chandu V.V.M.; Seo, Hyunwoong; Venkata-Haritha, Mallineni; Shiratani, Masaharu.

In: Journal of Electroanalytical Chemistry, Vol. 788, 01.03.2017, p. 131-136.

Research output: Contribution to journalArticle

Kim, Hee Je ; Xu, Guo Cheng ; Gopi, Chandu V.V.M. ; Seo, Hyunwoong ; Venkata-Haritha, Mallineni ; Shiratani, Masaharu. / Enhanced light harvesting and charge recombination control with TiO2/PbCdS/CdS based quantum dot-sensitized solar cells. In: Journal of Electroanalytical Chemistry. 2017 ; Vol. 788. pp. 131-136.
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