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Mechanistic and Time Resolved Single-Photon Counting Analysis for Light Harvesting Characteristics Depending on the Adsorption Mode of Organic Sensitizers in DSSCs

Title
Mechanistic and Time Resolved Single-Photon Counting Analysis for Light Harvesting Characteristics Depending on the Adsorption Mode of Organic Sensitizers in DSSCs
Authors
Jo, Hyo JeongNam, Jung EmHeo, H.Kim, Dae HwanKim, J. H.Kang, Jin Kyu
DGIST Authors
Kim, Dae HwanKang, Jin Kyu
Issue Date
2018-01
Citation
Journal of Physical Chemistry C, 122(2), 995-1002
Type
Article
Article Type
Article
Keywords
SOLAR-CELL APPLICATIONSTIO2 FILMSSQUARAINE DYESPHOTOVOLTAIC PERFORMANCECHARGE RECOMBINATIONENHANCED PERFORMANCEELECTRON INJECTIONTITANIUM-DIOXIDECOUMARIN DYESANATASE TIO2
ISSN
1932-7447
Abstract
This study investigated the origin of the improved photovoltaic performance of bibranched phenothiazine derivatives in DSSCs, in terms of the adsorption modes of the π-bridge dyes as sensitizers. Two novel twin acceptor type organic dyes with various π-bridge systems were designed and synthesized. We mainly focused on the binding mode of the dye on the TiO2 surface and investigated the effect of the adsorption mode on the characteristics of solar cells. A stronger chemical bonding and a fast electron injection were found to originate from the bridge bidentate mode. This adsorption mode was also found to have the fastest electron transfer bonding of a π-conjugation anchoring group for organic dyes with 3,4-ethylenedioxythiophene (EDOT). Meanwhile, using thiophene as a π-conjugated anchoring group with a monodentate adsorption mode was found to produce slower electron transfer. The structural differences due to the π-conjugated anchoring groups affect their electron injection/recombination properties. Further, we found that the DSSCs based on organic sensitizers containing EDOT exhibited significantly enhanced long-term stability. © 2017 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/5803
DOI
10.1021/acs.jpcc.7b05376
Publisher
American Chemical Society
Related Researcher
Files:
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Collection:
Convergence Research Center for Solar Energy1. Journal Articles


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