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Core/Shell PbSe/PbS QDs TiO sub(2) Heterojunction Solar Cell

Advanced functional materials, 2013-06, Vol.23 (21), p.2736-2741 [Peer Reviewed Journal]

ISSN: 1616-301X ;EISSN: 1616-3028 ;DOI: 10.1002/adfm.201202322

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  • Title:
    Core/Shell PbSe/PbS QDs TiO sub(2) Heterojunction Solar Cell
  • Author: Etgar, Lioz ; Yanover, Diana ; Capek, Richard Karel ; Vaxenburg, Roman ; Xue, Zhaosheng ; Liu, Bin ; Nazeeruddin, Mohammad Khaja ; Lifshitz, Efrat ; Graetzel, Michael
  • Subjects: Deposition
  • Is Part Of: Advanced functional materials, 2013-06, Vol.23 (21), p.2736-2741
  • Description: Quasi type-II PbSe/PbS quantum dots (QDs) are employed in a solid state high efficiency QD/TiO sub(2) heterojunction solar cell. The QDs are deposited using layer-by-layer deposition on a half-micrometer-thick anatase TiO sub(2) 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 TiO sub(2) 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/TiO sub(2) heterojunction solar cell produces a light to electric power conversion efficiency ( eta ) of 4% with short circuit photocurrent (J sub(sc)) of 17.3 mA/cm super(2). This report demonstrates highly efficient core/shell near infrared QDs in a QD/TiO sub(2) heterojunction solar cell. PbSe core and PbSe/PbS core/shell quantum dots (QDs) are employed in a QD/TiO sub(2) heterojunction solar cell. Theoretical calculations show that the wave functions of the electrons and holes are extended to both materials, which contributes to the better photovoltaic performance of the PbSe/PbS core/shell compared to the PbSe core. The PbSe/PbS core/shell heterojunction solar cell produces a power conversion efficiency of 3.93%.
  • Language: English
  • Identifier: ISSN: 1616-301X
    EISSN: 1616-3028
    DOI: 10.1002/adfm.201202322
  • Source: Alma/SFX Local Collection
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