The chemistry of the precursor from which charge transport layers are formed can significantly affect the device performance of organic solar cells. Here, we compare two common precursors that are used to generate titania electron transport layers and elucidate their effects on the transient characteristics of inverted bulk-heterojunction polymer solar cells comprising poly(3-hexyl hiophene) and [6,6]-phenyl-C61-butyric acid methyl ester. Substituting the isopropyl ligands of titanium isopropoxide with 2-methoxyethanol leads to electron transport layers that require a shorter illumination time to fill shallow electron traps. Furthermore, organic solar cells with titania electron transport layers prepared with such pre-modified titania precursor exhibit higher power-conversion efficiencies stemming from lower trap densities.
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11 March 2013
Research Article|
March 14 2013
Ligand chemistry of titania precursor affects transient photovoltaic behavior in inverted organic solar cells
Jong Bok Kim;
Jong Bok Kim
a)
1Department of Chemical and Biological Engineering,
Princeton University
, Princeton, New Jersey 08544, USA
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Seokhoon Ahn;
Seokhoon Ahn
b)
2Department of Chemistry,
Columbia University
, New York, New York 10027, USA
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Seok Ju Kang;
Seok Ju Kang
2Department of Chemistry,
Columbia University
, New York, New York 10027, USA
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Colin Nuckolls;
Colin Nuckolls
2Department of Chemistry,
Columbia University
, New York, New York 10027, USA
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Yueh-Lin Loo
Yueh-Lin Loo
c)
1Department of Chemical and Biological Engineering,
Princeton University
, Princeton, New Jersey 08544, USA
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a)
Present address: KIER-UNIST Advanced Center for Energy, Korea Institute of Energy Research, Ulsan 689-798, Korea.
b)
Present address: Institute of Advanced Composite Materials, Korea Institute of Science and Technology, Wanju 569-905, Korea.
c)
Author to whom correspondence should be addressed. Electronic mail: lloo@princeton.edu.
Appl. Phys. Lett. 102, 103302 (2013)
Article history
Received:
October 10 2012
Accepted:
February 28 2013
Citation
Jong Bok Kim, Seokhoon Ahn, Seok Ju Kang, Colin Nuckolls, Yueh-Lin Loo; Ligand chemistry of titania precursor affects transient photovoltaic behavior in inverted organic solar cells. Appl. Phys. Lett. 11 March 2013; 102 (10): 103302. https://doi.org/10.1063/1.4795287
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