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Sudhagar, P.,Gonzá,lez-Pedro, Victoria,Mora-Seró,, Ivá,n,Fabregat-Santiago, Francisco,Bisquert, Juan,Kang, Yong Soo The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.28
<P>Herein we report generic surface treatment approaches to improve the electronic interfaces of quantum dot-sensitized TiO<SUB>2</SUB> fiber electrodes, thereby promoting their photoanode performance. Highly dense, continuous and nanostructured TiO<SUB>2</SUB> fibrous membranes, without the inclusion of a scattering layer, unlike conventional TiO<SUB>2</SUB> particulate electrodes, showed feasible photoconversion performance under the proposed interfacial engineering modification. The proposed interfacial treatment concerns fibrous membranes both before and after calcination. The chemical vapor pre-treatment on an as-deposited fibrous membrane using tetrahydrofuran (THF) reinforces the physical contact between the fibrous membrane and the transparent conducting substrate and reduces significantly the recombination rate. In the case of post-treatment by F-ion on a fibrous surface, together with the interfacial engineering approach, the ZnS surface passivation layer markedly improves the photoanode performance of the TiO<SUB>2</SUB> fibrous membrane nearly to a factor of 3.2% with a remarkable open-circuit voltage <I>V</I><SUB>oc</SUB> = 0.69 V and <I>J</I><SUB>sc</SUB> = 13 mA cm<SUP>−2</SUP> under 1 sun illumination (100 mW cm<SUP>−2</SUP>). This report provides an excellent platform for studying and understanding the interfacial contacts and mechanisms related to the charge transfer at CdS/CdSe QD-sensitized TiO<SUB>2</SUB> fibrous assemblies. Such implications of this interfacial treatment strategy can be successfully extended to a wide range of photoanode candidates in energy conversion systems and confirm the effectiveness of some alternative nanostructured electrodes for the development of semiconductor-sensitized solar cells.</P> <P>Graphic Abstract</P><P>The generic surface treatment approaches were demonstrated to improve the electronic interfaces of quantum dot-sensitized TiO<SUB>2</SUB> fiber electrodes, thereby improving their photoanode performance in solar cells. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm31599h'> </P>
Han, Hyungkyu,Sudhagar, P.,Song, Taeseup,Jeon, Yeryung,Mora-Seró,, Ivá,n,Fabregat-Santiago, Francisco,Bisquert, Juan,Kang, Yong Soo,Paik, Ungyu The Royal Society of Chemistry 2013 Chemical communications Vol.49 No.27
<P>Facile synthesis of TiO<SUB>2</SUB> nanotube branched (length ∼0.5 μm) thin hollow-nanofibers is reported. The hierarchical three dimensional photoanodes (H-TiO<SUB>2</SUB>-NFs) (only ∼1 μm thick) demonstrate their excellent candidature as photoanodes in QD-sensitized solar cells, exhibiting ∼3-fold higher energy conversion efficiency (<I>η</I> = 2.8%, <I>J</I><SUB>sc</SUB> = 8.8 mA cm<SUP>−2</SUP>) than that of the directly grown nanotube arrays on a transparent conducting oxide (TCO) substrate (<I>η</I> = 0.9%, <I>J</I><SUB>sc</SUB> = 2.5 mA cm<SUP>−2</SUP>).</P> <P>Graphic Abstract</P><P>Facile synthesis of TiO<SUB>2</SUB> nanotube branched (length ∼0.5 μm) thin hollow-nanofibers is reported. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cc40439k'> </P>
Kim, Sungwoo,Im, Sang Hyuk,Kang, Meejae,Heo, Jin Hyuck,Seok, Sang Il,Kim, Sang-Wook,Mora-Seró,, Ivá,n,Bisquert, Juan The Royal Society of Chemistry 2012 Physical chemistry chemical physics Vol.14 No.43
<P>PbS colloidal quantum dot (CQD)-sensitized inorganic–organic heterojunction solar cells fabricated by using the PbS CQDs co-capped by the oleic acid (OA) and 1-dodecanethiol (DT) ligand showed better device stability with aging time under ambient conditions without encapsulation. Furthermore, the device performance is better than the cell fabricated from PbS CQDs without DT ligand. The enhancement of performance in OA and DT co-capped systems is investigated by impedance spectroscopy. An upward displacement of the TiO<SUB>2</SUB> conduction band, with a consequent increase of <I>V</I><SUB>oc</SUB>, results in the improved performance when CQD with DT are employed.</P> <P>Graphic Abstract</P><P>PbS colloidal quantum dot (CQD)-sensitized inorganic–organic heterojunction solar cells fabricated by using the PbS CQDs co-capped by the oleic acid (OA) and 1-dodecanethiol (DT) ligand showed better device stability with aging time under ambient conditions without encapsulation. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cp43223d'> </P>