Simultaneous enhancement of charge generation quantum yield and carrier transport in organic solar cells

Armin, Ardalan, Wolfer, Pascal, Shaw, Paul E., Hambsch, Mike, Maasoumi, Fatemeh, Ullah, Mujeeb, Gann, Eliot, McNeill, Christopher R., Li, Jun, Shi, Zugui, Burn, Paul L. and Meredith, Paul (2015) Simultaneous enhancement of charge generation quantum yield and carrier transport in organic solar cells. Journal of Materials Chemistry C, 3 41: 10799-10812. doi:10.1039/c5tc02133b

Author Armin, Ardalan
Wolfer, Pascal
Shaw, Paul E.
Hambsch, Mike
Maasoumi, Fatemeh
Ullah, Mujeeb
Gann, Eliot
McNeill, Christopher R.
Li, Jun
Shi, Zugui
Burn, Paul L.
Meredith, Paul
Title Simultaneous enhancement of charge generation quantum yield and carrier transport in organic solar cells
Journal name Journal of Materials Chemistry C   Check publisher's open access policy
ISSN 2050-7526
Publication date 2015-09-24
Year available 2015
Sub-type Article (original research)
DOI 10.1039/c5tc02133b
Open Access Status Not yet assessed
Volume 3
Issue 41
Start page 10799
End page 10812
Total pages 14
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Collection year 2016
Language eng
Formatted abstract
Bulk heterojunction (BHJ) organic solar cells and photodiodes require optimised active layer structures for both charge carrier photo-generation and extraction to occur efficiently. The most efficient polymer:fullerene devices comprising narrow optical gap donor polymers invariably have a high fullerene fraction. In such circumstances photo-generated carrier extraction is compromised, as charge transport is often unbalanced with electron transport in the fullerene dominating. In this current work we study the high efficiency blend system poly(2,5-{2-octyldodecyl}-3,6-diketopyrrolopyrrole-alt-5,5-{2′,5′-di[thien-2-yl]thieno[3,2-b]thiophene}) (DPP–DTT):phenyl-C71-butyric acid methyl ester (PC70BM). We show that by manipulating the packing of the (DPP–DTT) chains, large hole mobilities >0.02 cm2 V−1 s−1 can be obtained in a simple polymer-only diode. More importantly, when blended with PC70BM in a 1 : 3 ratio the hole mobility was found to increase to 0.2 cm2 V−1 s−1. This is the first case of a polymer:fullerene solar cell where the charge carrier transport is limited by the electron mobility of the fullerene rather than the hole mobility of the donor material. Photophysical measurements reveal that the charge generation quantum yield is also enhanced when the DPP–DTT chains are optimally packed. The simultaneous improvement of the charge transport properties and charge generation quantum yield delivers an order of magnitude increase in the power conversion efficiency.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2016 Collection
School of Chemistry and Molecular Biosciences
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Citation counts: TR Web of Science Citation Count  Cited 1 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 1 times in Scopus Article | Citations
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