Core/shell PbSe/PbS QDs TiO2 heterojunction solar cell

Lioz Etgar*, Diana Yanover, Richard Karel Čapek, Roman Vaxenburg, Zhaosheng Xue, Bin Liu, Mohammad Khaja Nazeeruddin, Efrat Lifshitz, Michael Grätzel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

98 Scopus citations

Abstract

Quasi type-II PbSe/PbS quantum dots (QDs) are employed in a solid state high efficiency QD/TiO2 heterojunction solar cell. The QDs are deposited using layer-by-layer deposition on a half-micrometer-thick anatase TiO2 nanosheet film with (001) exposed facets. Theoretical calculations show that the carriers in PbSe/PbS quasi type-II QDs are delocalized over the entire core/shell structure, which results in better QD film conductivity compared to PbSe QDs. Moreover, PbS shell permits better stability and facile electron injection from the QDs to the TiO2 nanosheets. To complete the electrical circuit of the solar cell, a Au film is evaporated as a back contact on top of the QDs. This PbSe/PbS QD/TiO2 heterojunction solar cell produces a light to electric power conversion efficiency (η) of 4% with short circuit photocurrent (Jsc) of 17.3 mA/cm2. This report demonstrates highly efficient core/shell near infrared QDs in a QD/TiO2 heterojunction solar cell.

Original languageAmerican English
Pages (from-to)2736-2741
Number of pages6
JournalAdvanced Functional Materials
Volume23
Issue number21
DOIs
StatePublished - 6 Jun 2013

Keywords

  • PbSe/PbS
  • core shell
  • heterojunction solar cell
  • stability
  • wave function

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