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Charge separation dynamics in a narrow band gap polymer-PbS nanocrystal blend for efficient hybrid solar cells
Ist Teil von
Journal of materials chemistry, 2012-12, Vol.22 (46), p.24411-24416
Erscheinungsjahr
2012
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
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.
An opportune mixing of PbS nanocrystals and a narrow band gap polymer led to hybrid solar cells with a broad spectral response and an efficiency of ∼3%.