Charge separation dynamics in a narrow band gap polymer-PbS nanocrystal blend for efficient hybrid solar cells.

Claudia Piliego, Marianna Manca, Renee Kroon, Maksym Yarema, Kristztina Szendrei, Mats R. Andersson, Wolfgang Heiss, Maria Loi

    Research output: Contribution to journalArticle

    44 Citations (Scopus)

    Abstract

    We have demonstrated efficient hybrid solar cells based on lead sulfide (PbS) nanocrystals and a narrow band gap polymer, poly[{2,5-bis(2-hexyldecyl)-2, 3,5,6-tetrahydro-3,6-dioxopyrrolo[3,4-c]pyrrole-1,4-diyl}-alt-{[2,2′-(1, 4-phenylene)bis-thiophene]-5,5′-diyl}], (PDPPTPT). An opportune mixing of the two materials led to the formation of an energetically favorable bulk hetero-junction with a broad spectral response. Using a basic device structure, we reached a power conversion efficiency of ∼3%, which is one of the highest values reported for this class of solar cells. Photo-physical measurements carried out on the device provided insights into the working mechanism: the comparison between the time decay of the pristine polymer and the polymer-PbS blend allows us to conclude that efficient charge transfer is taking place in this hybrid system.

    Original languageEnglish
    Pages (from-to)24411-24416
    Number of pages6
    JournalJournal of Materials Chemistry
    Volume22
    Issue number46
    DOIs
    Publication statusPublished - 14 Dec 2012

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