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Article: Functions of Self-assembled Ultrafine TiO2 Nanocrystals for High Efficient Dye-Sensitized Solar Cells

TitleFunctions of Self-assembled Ultrafine TiO2 Nanocrystals for High Efficient Dye-Sensitized Solar Cells
Authors
Issue Date2014
Citation
ACS Applied Materials & Interfaces, 2014, v. 6 n. 8, p. 5367-5373 How to Cite?
AbstractIn this paper, we demonstrate a simple approach of self-assembled process to form a very smooth and compacted TiO2 underlayer film from ultrafine titanium oxide (TiO2) nanocrystals with dimension of 4 nm for improving the electrical properties and device performances of dye-sensitized solar cells (DSSCs). Because the TiO2 film self-assembles by simply casting the TiO2 on fluorine-doped tin oxide (FTO) substrate, it can save a lot of materials in the process. As compared with control DSSC without the self-assembled TiO2 (SA-TiO2) layer, short-circuit current density (Jsc) improves from 14.9 mA/cm(2) for control DSSC to 17.3 mA/cm(2) for masked DSSC with the SA-TiO2 layer. With the very smooth SA-TiO2 layer, the power conversion efficiency is enhanced from 8.22% (control) to 9.35% for the DSSCs with mask and from 9.79% (control) to 11.87% for the DSSCs without mask. To explain the improvement, we have studied the optical properties, morphology, and workfunction of the SA-TiO2 layer on FTO substrate as well as the impedance spectrum of DSSCs. Importantly, we find that the SA-TiO2 layers have better morphology, uniformity, and contact with FTO electrode, increased workfunction and optical transmission, as well as reduced charge recombination at the contact of FTO substrate contributing to the improved device performances. Consequently, our results show that the simple self-assembly of TiO2 ultrafine nanocrystals forms a very good electron extraction layer with both improved optical and electrical properties for enhancing performances of DSSCs.
Persistent Identifierhttp://hdl.handle.net/10722/202881
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorXie, Fen_US
dc.contributor.authorCherng, S. J.en_US
dc.contributor.authorLu, Sen_US
dc.contributor.authorChang, Y. H.en_US
dc.contributor.authorSha, Wen_US
dc.contributor.authorFeng, S. P.en_US
dc.contributor.authorChen, C. M.en_US
dc.contributor.authorChoy, WCHen_US
dc.date.accessioned2014-09-19T10:09:09Z-
dc.date.available2014-09-19T10:09:09Z-
dc.date.issued2014en_US
dc.identifier.citationACS Applied Materials & Interfaces, 2014, v. 6 n. 8, p. 5367-5373en_US
dc.identifier.urihttp://hdl.handle.net/10722/202881-
dc.description.abstractIn this paper, we demonstrate a simple approach of self-assembled process to form a very smooth and compacted TiO2 underlayer film from ultrafine titanium oxide (TiO2) nanocrystals with dimension of 4 nm for improving the electrical properties and device performances of dye-sensitized solar cells (DSSCs). Because the TiO2 film self-assembles by simply casting the TiO2 on fluorine-doped tin oxide (FTO) substrate, it can save a lot of materials in the process. As compared with control DSSC without the self-assembled TiO2 (SA-TiO2) layer, short-circuit current density (Jsc) improves from 14.9 mA/cm(2) for control DSSC to 17.3 mA/cm(2) for masked DSSC with the SA-TiO2 layer. With the very smooth SA-TiO2 layer, the power conversion efficiency is enhanced from 8.22% (control) to 9.35% for the DSSCs with mask and from 9.79% (control) to 11.87% for the DSSCs without mask. To explain the improvement, we have studied the optical properties, morphology, and workfunction of the SA-TiO2 layer on FTO substrate as well as the impedance spectrum of DSSCs. Importantly, we find that the SA-TiO2 layers have better morphology, uniformity, and contact with FTO electrode, increased workfunction and optical transmission, as well as reduced charge recombination at the contact of FTO substrate contributing to the improved device performances. Consequently, our results show that the simple self-assembly of TiO2 ultrafine nanocrystals forms a very good electron extraction layer with both improved optical and electrical properties for enhancing performances of DSSCs.en_US
dc.languageengen_US
dc.relation.ispartofACS Applied Materials & Interfacesen_US
dc.titleFunctions of Self-assembled Ultrafine TiO2 Nanocrystals for High Efficient Dye-Sensitized Solar Cellsen_US
dc.typeArticleen_US
dc.identifier.emailXie, F: fxxie@hku.hken_US
dc.identifier.emailLu, S: shunmian@gmail.comen_US
dc.identifier.emailSha, W: shawei@hku.hken_US
dc.identifier.emailChoy, WCH: chchoy@eee.hku.hken_US
dc.identifier.authoritySha, W=rp01605en_US
dc.identifier.authorityChoy, WCH=rp00218en_US
dc.identifier.doi10.1021/am5006628-
dc.identifier.scopuseid_2-s2.0-84899535064-
dc.identifier.hkuros238577en_US
dc.identifier.hkuros234424-
dc.identifier.volume6en_US
dc.identifier.spage5367en_US
dc.identifier.epage5373en_US
dc.identifier.isiWOS:000335086000006-

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