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Kim, Jihun,Shim, Hyun-Sub,Lee, Horim,Choi, Min-Soo,Kim, Jang-Joo,Seo, Yongsok American Chemical Society 2014 The Journal of Physical Chemistry Part C Vol.118 No.22
<P>Two novel electron-donor molecules based on donor−π-conjugated linker–acceptor structure with compact packing and intramolecular charge-transfer characteristics were synthesized for the preparation of efficient organic solar cells. The donor molecules featuring an electron-rich triphenyl amine as the electron-donor unit, dicyanovinylene as the acceptor unit, and π-conjugated linkers of thienothiophene, thiophene, and thiazole units were synthesized. The π-conjugated linkers were carefully designed to have a planar structure, an efficient conjugation length, and appropriate energy levels for a compact packing in the solid state. The vacuum-processed solar cells fabricated using the donor molecules of DTTh and DTTz exhibited average power-conversion efficiencies (PCEs) of 5.4 and 6.2% (the highest PCE obtained was 6.37%) under AM 1.5G illumination with an intensity of 100 mW cm<SUP>–2</SUP>.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2014/jpccck.2014.118.issue-22/jp5017467/production/images/medium/jp-2014-017467_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp5017467'>ACS Electronic Supporting Info</A></P>
Co-sensitization of metal free organic dyes in flexible dye sensitized solar cells
Lee, Horim,Kim, Jihun,Kim, Dong Young,Seo, Yongsok Elsevier 2018 ORGANIC ELECTRONICS Vol.52 No.-
<P><B>Abstract</B></P> <P>A metal-free organic dye (JH-1) and an unsymmetrical squaraine dye (SQ2) were used for co-sensitization of a flexible TiO<SUB>2</SUB> electrode in order to obtain a broad spectral response in the visible light regions. Because of enhanced light absorption, the performance of the flexible plastic dye-sensitized solar cells (DSSCs) was enhanced. The dye concentration of co-sensitized TiO<SUB>2</SUB> film was higher than that of individual dye-sensitized TiO<SUB>2</SUB> film, leading to improved photovoltaic performance with the panchromatic light harvesting of JH-1 and SQ2 (350–720 nm). Optimum molar ratio of individual dye, dye concentration and adsorption kinetics onto the TiO<SUB>2</SUB> photoelectrode, and ideal thickness of HS-TiO<SUB>2</SUB> layer have been investigated. A flexible DSSC co-sensitized with the molar ratio of 60:40 (JH-1:SQ2) and TiO<SUB>2</SUB> film thickness of 6 μm yielded a high photocurrent density of 12.32 mA cm<SUP>−2</SUP>, an open circuit voltage of 0.754 V, a fill factor of 0.68, and a power conversion efficiency of 6.31% under 1 sun illumination (100 mW cm<SUP>−2</SUP>). Interestingly, the co-sensitizers did not compete with each other for the absorption. Both the open circuit photovoltage and the photocurrent density were unexpectedly increased with co-sensitization which means that enhancement in photocurrents can be achieved without sacrificing the open circuit photovoltage for the co-sensitized solar cells, once the electron recombination and dye aggregation are retarded by the co-sensitization.</P> <P><B>Highlights</B></P> <P> <UL> <LI> An organic dye (JH-1) and a squaraine dye (SQ2) were used for co-sensitization of a flexible TiO2 electrode. </LI> <LI> Because of enhanced light absorption, the performance of the flexible DSSCs was enhanced. </LI> <LI> A DSSC with a molar ratio of 60:40 (JH-1:SQ2) yielded a power conversion efficiency of 6.31%. </LI> <LI> Both V<SUB>OC</SUB> and J<SUB>SC</SUB> were unexpectedly increased with co-sensitization. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lee, Horim,Hwang, Daesub,Jo, Seong Mu,Kim, Dongho,Seo, Yongsok,Kim, Dong Young American Chemical Society 2012 ACS APPLIED MATERIALS & INTERFACES Vol.4 No.6
<P>Hierarchically structured TiO<SUB>2</SUB> (HS-TiO<SUB>2</SUB>) was prepared on a flexible ITO-PEN (polyethylene naphthalate) substrate via electrospray deposition using a commercially available TiO<SUB>2</SUB> nanocrystalline powder in order to fabricate flexible DSSCs under low-temperature (<150 °C) conditions. The cell efficiency increased when using flexible ITO-PEN substrates post-treated by either a mechanical compression treatment or a chemical sintering treatment using titanium n-tetrabutoxide (TTB). The mechanical compression treatment reduced the surface area and porosity of the HS-TiO<SUB>2</SUB>; however, this treatment improved the interparticle connectivity and physical adhesion between the HS-TiO<SUB>2</SUB> and ITO-PEN substrate, which increased the photocurrent density of the as-pressed HS-TiO<SUB>2</SUB> cells. The electron diffusion coefficients of the as-pressed HS-TiO<SUB>2</SUB> improved upon compression treatment, whereas the recombination lifetimes remained unchanged. An additional chemical sintering post-treatment involving TTB was tested for its effects on DSSC efficiency. The freshly coated TiO<SUB>2</SUB> submitted to TTB hydrolysis in water at 100 °C yielded an anatase phase. TTB treatment of the HS-TiO<SUB>2</SUB> cell after compression treatment yielded faster electron diffusion, providing an efficiency of 5.57% under 100 mW cm<SUP>–2</SUP>, AM 1.5 global illumination.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2012/aamick.2012.4.issue-6/am3007164/production/images/medium/am-2012-007164_0008.gif'></P>