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Morphology Control in TiO2 Nanorod/Polythiophene Composites for Bulk Heterojunction Solar Cells Using Hydrogen Bonding
journal contribution
posted on 2012-11-13, 00:00 authored by Ying Lin, Qingshuo Wei, Gang Qian, Li Yao, James J. WatkinsHydrogen bond interactions between a dye adsorbed at
the interface of TiO2 nanorods and functionalized P3HT
was used to control nanorod dispersion, increase interfacial area,
and improve efficiency in solution-processable hybrid bulk heterojunction
solar cells. A series of poly(3-hexylthiophene-b-ethylene
glycol) (P3HT-b-PEG) copolymers were prepared by
a combination of Grignard metathesis polymerization and click chemistry.
The short PEG segments in P3HT-b-PEG serve as a hydrogen
bond acceptor. TiO2 nanorods functionalized with N3-dye
bearing multiple COOH groups function as both the electron acceptor
and hydrogen bond donor. The strong preferential H-bonding interaction
between TiO2 nanorods and the PEG chain limits the aggregation
of the TiO2 nanorods and affords homogeneously dispersion
of the nanorods within the polymer matrix to form an interpenetrating
network. This structure provides large interfacial area between electron
donor and acceptor and highly efficient transport pathways within
the composite. Hybrid devices constructed from copolymers with 10
wt % PEG and N3-dye TiO2 nanorods exhibit power conversion
efficiency ∼50% higher than that of conventional P3HT homopolymer
and N3-dye TiO2 nanorods.
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Keywords
PEG segmentsTiO 2 nanorods functionalizedMorphology ControlHybrid devicesBulk Heterojunction Solar CellsP 3HT homopolymerbulk heterojunctionelectron donorelectron acceptorCOOH groups functionfunctionalized P 3HTGrignard metathesis polymerizationTiO 2 nanorodshydrogen bond donortransport pathwaysHydrogen BondingHydrogen bond interactionsinterpenetrating networkhydrogen bond acceptorPEG chain limitsP 3HT copolymerspolymer matrixcontrol nanorod dispersionclick chemistryP 3HT
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