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Core/Shell PbSe/PbS QDs TiO 2 Heterojunction Solar Cell
Author(s) -
Etgar Lioz,
Yanover Diana,
Čapek Richard Karel,
Vaxenburg Roman,
Xue Zhaosheng,
Liu Bin,
Nazeeruddin Mohammad Khaja,
Lifshitz Efrat,
Grätzel Michael
Publication year - 2013
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201202322
Subject(s) - materials science , heterojunction , quantum dot , solar cell , photocurrent , optoelectronics , nanosheet , nanotechnology , energy conversion efficiency , nanocomposite
Abstract Quasi type‐II PbSe/PbS quantum dots (QDs) are employed in a solid state high efficiency QD/TiO 2 heterojunction solar cell. The QDs are deposited using layer‐by‐layer deposition on a half‐micrometer‐thick anatase TiO 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 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 2 heterojunction solar cell produces a light to electric power conversion efficiency ( η ) of 4% with short circuit photocurrent ( J sc ) of 17.3 mA/cm 2 . This report demonstrates highly efficient core/shell near infrared QDs in a QD/TiO 2 heterojunction solar cell.