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Conference Paper: Organic Solar Cells with Efficiency of 9% Achieved by Using Multiple Plasmonic Nanostructures

TitleOrganic Solar Cells with Efficiency of 9% Achieved by Using Multiple Plasmonic Nanostructures
Authors
Issue Date2013
PublisherElectromagnetics Academy.
Citation
The 34th Progress in Electromagnetic Research Symposium (PIERS), Stockholm, Sweden, 12-15 August 2013. In the Progress In Electromagnetics Research Symposium Abstracts, 2013, p. 1155 How to Cite?
AbstractPolymer-fullerene-based bulk heterojunction (BHJ) solar cells have many advantages including low-cost, low-temperature fabrication, semi-transparency, and mechanical flexibility [1, 2]. However, there is a mismatch between optical absorption length and charge transport scale [3, 4]. These factors lead to recombination losses, higher series resistances and lower fill factors. Attempts to optimize both the optical and electrical properties of the photoactive layer in organic solar cells (OSCs) inevitably result in a demand to develop a device architecture that can enable efficient optical absorption in films thinner than optical absorption length [5, 6]. Here, we report the use of multiple metallic nanostructures to achieve the broad light absorption enhancement, increased short-circuit circuit (Jsc) and improved fill factor (FF) simultaneously based on a new small-bandgap polymer donor of poly {[4,8-bis-(2-ethyl-hexyl-thiophene-5-yl)-benzo[1,2- b:4,5-b’]dithiophene-2,6-diyl]-alt-[2-(2-ethyl-hexanoyl)-thieno[3,4-b]thiophen-4,6-diyl]} (PBDTTT-C-T) in BHJ cells [7]. The multiple metallic nanostructure consists of 2D arrays of metallic nanograting electrode as a back reflector and metallic nanoparticles (NPs) with different geometries embedded into the active layer. Apart from the waveguide modes and diffractions, we simultaneously introduce hybridized surface plasmonic resonances (from Ag nanograting) and localized plasmonic resonances (from Au and Ag NPs [8]) to successfully achieve a broadband absorption enhancement. The detail understanding has been described with our theoretically studies. Consequently, we improve PCE to ∼9% [9] by improving both optical and electrical properties of single-junction OSCs through introducing dual plasmonic nanostructures which contribute to the practical application of OSCs for photovoltaics.
DescriptionSession 3P4b SC2: Plasmonic Nanomaterials and Nanostrcutures for Photovoltaics and Optoelectronics in Energy 1
Persistent Identifierhttp://hdl.handle.net/10722/204084
ISSN

 

DC FieldValueLanguage
dc.contributor.authorChoy, WCHen_US
dc.date.accessioned2014-09-19T20:04:40Z-
dc.date.available2014-09-19T20:04:40Z-
dc.date.issued2013en_US
dc.identifier.citationThe 34th Progress in Electromagnetic Research Symposium (PIERS), Stockholm, Sweden, 12-15 August 2013. In the Progress In Electromagnetics Research Symposium Abstracts, 2013, p. 1155en_US
dc.identifier.issn1559-9450-
dc.identifier.urihttp://hdl.handle.net/10722/204084-
dc.descriptionSession 3P4b SC2: Plasmonic Nanomaterials and Nanostrcutures for Photovoltaics and Optoelectronics in Energy 1-
dc.description.abstractPolymer-fullerene-based bulk heterojunction (BHJ) solar cells have many advantages including low-cost, low-temperature fabrication, semi-transparency, and mechanical flexibility [1, 2]. However, there is a mismatch between optical absorption length and charge transport scale [3, 4]. These factors lead to recombination losses, higher series resistances and lower fill factors. Attempts to optimize both the optical and electrical properties of the photoactive layer in organic solar cells (OSCs) inevitably result in a demand to develop a device architecture that can enable efficient optical absorption in films thinner than optical absorption length [5, 6]. Here, we report the use of multiple metallic nanostructures to achieve the broad light absorption enhancement, increased short-circuit circuit (Jsc) and improved fill factor (FF) simultaneously based on a new small-bandgap polymer donor of poly {[4,8-bis-(2-ethyl-hexyl-thiophene-5-yl)-benzo[1,2- b:4,5-b’]dithiophene-2,6-diyl]-alt-[2-(2-ethyl-hexanoyl)-thieno[3,4-b]thiophen-4,6-diyl]} (PBDTTT-C-T) in BHJ cells [7]. The multiple metallic nanostructure consists of 2D arrays of metallic nanograting electrode as a back reflector and metallic nanoparticles (NPs) with different geometries embedded into the active layer. Apart from the waveguide modes and diffractions, we simultaneously introduce hybridized surface plasmonic resonances (from Ag nanograting) and localized plasmonic resonances (from Au and Ag NPs [8]) to successfully achieve a broadband absorption enhancement. The detail understanding has been described with our theoretically studies. Consequently, we improve PCE to ∼9% [9] by improving both optical and electrical properties of single-junction OSCs through introducing dual plasmonic nanostructures which contribute to the practical application of OSCs for photovoltaics.-
dc.languageengen_US
dc.publisherElectromagnetics Academy.-
dc.relation.ispartofProgress in Electromagnetic Research Symposium (PIERS)en_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleOrganic Solar Cells with Efficiency of 9% Achieved by Using Multiple Plasmonic Nanostructuresen_US
dc.typeConference_Paperen_US
dc.identifier.emailChoy, WCH: chchoy@eee.hku.hken_US
dc.identifier.authorityChoy, WCH=rp00218en_US
dc.description.naturepublished_or_final_version-
dc.identifier.hkuros238592en_US
dc.identifier.spage1155-
dc.identifier.epage1155-
dc.publisher.placeUnited States-

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