Enhancement of photocurrent generation and open circuit voltage in dye-sensitized solar cells using Li+ trapping species in the gel electrolyte

Benedetti, João E.; Paoli, Marco-Aurélio De; Nogueira, Ana F.

doi:10.1039/b717278h

Cited by 69 publications

(68 citation statements)

References 35 publications

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“…Several methods have been developed to fabricate ssDSSCs employing quasi-solid or solid polymer electrolytes. [3][4][5][6][7][8][9][10][11] In ssDSSCs, hole transporting materials (HTMs) and the control of interfacial properties between the nanoporous TiO 2 layer and the HTM are critical to the photoconversion effi ciency of the cells. Recently, HTMs have been extensively investigated as potential replacements for conventional I 3 − /I − redox electrolyte systems using iodine (I 2 ) in DSSCs.…”

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confidence: 99%

Highly Efficient, Iodine‐Free Dye‐Sensitized Solar Cells with Solid‐State Synthesis of Conducting Polymers

et al. 2011

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Dye-sensitized solar cells (DSSCs) are low-cost photovoltaic devices that provide a high energy conversion effi ciency of 11%. [ 1 ] High conversion effi ciency, good stability, and easy fabrication are essential for commercialization of DSSCs. [ 2 ] Although DSSCs with liquid electrolytes have been reported to exhibit high effi ciency, there has been interest in developing a solid-state DSSC (ssDSSC) due to its potential to decrease the overall weight of the cells and to provide long-term durability and fl exibility. Several methods have been developed to fabricate ssDSSCs employing quasi-solid or solid polymer electrolytes. [3][4][5][6][7][8][9][10][11] In ssDSSCs, hole transporting materials (HTMs) and the control of interfacial properties between the nanoporous TiO 2 layer and the HTM are critical to the photoconversion effi ciency of the cells. Recently, HTMs have been extensively investigated as potential replacements for conventional I 3 − /I − redox electrolyte systems using iodine (I 2 ) in DSSCs. [12][13][14][15][16][17][18] As an organic HTM, spiro-OMeTAD was used for an iodine free ssDSSC and showed higher effi ciency of 5.1%. [ 17 , 18 ] Inorganic HTMs such as CuI showed a good effi ciency of 4.7%, [ 12 ] but the crystal formation of metal oxide gradually reduced cell performance. [ 19 ] Another possibility is the utilization of p-type conducting polymers, e.g., polypyrrole, polyaniline, polydiacetylene, poly (3-octylthiopehene), and poly(3,4-ethylenedioxythiophene) (PEDOT). [20][21][22][23][24][25][26] These polymers are advantageous over other small molecules due to their low cost, good stability, simple fabrication using spin-coating, and easy preparation of designable structures. Recently, Ho et al. reported an iodine (I 2 )-free ssDSSC using polyaniline/carbon black composite with imidazolium iodide derivatives, which effectively generates I − / I 3 − redox couples without addition of iodine (I 2 ). [ 27 ] However, while conductive polymers offer many advantages, they show low energy conversion effi ciencies due to poor penetration into the nanopores of TiO 2 photoelectrodes that arises from mismatches between the molecular sizes of the polymers and the pore sizes of the TiO 2 layer. Recently, Yanagida et al. were successful at improving the power conversion effi ciency signifi cantly up to 2.85%, which was the highest effi ciency for an iodine-free ssDSSC using a conductive polymer as HTM. [28][29][30] The penetration of a conductive polymer into TiO 2 porous layers was successfully improved via the in situ photoelectrochemical polymerization of a heterocyclic monomer, e.g., 2,2'-bis(3,4-ethylenedioxythiophene) (bis-EDOT). [ 29 ] However, the maximum penetration depth of the conductive polymer into the TiO 2 layer was 4-5 μ m, above which cell effi ciency was decreased, resulting from insuffi cient interfacial properties of electrode/HTM despite increased dye adsorption. More recently, Liu et al. further improved cell efficiency up to 6.1% using indoline D149 dye as a sensitizer, [ 31 ] whe...

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Highly Efficient, Iodine‐Free Dye‐Sensitized Solar Cells with Solid‐State Synthesis of Conducting Polymers

et al. 2011

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“…Interaction wavelength ranges of different external wave phenomena become comparable with nanoscale, which makes the materials suitable for the various applications of optoelectronics. The energy quantization dramatically changes electronic band structure in nanomaterials and therefore alters their optical, magnetic, and electronic properties [76][77][78][79][80][81]. Thus, the consequences of quantum confinement in low dimension are fundamental as well as technologically important.…”

Section: Scope Of Nanoscience In Environmental Chemistrymentioning

confidence: 99%

Applications of nanomaterials in the different fields of photosciences

Mandal

Ganguly

2011

Indian J Phys

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Current developments in nanostructured materials and nanotechnology will have profound impact in many areas such as energy technologies and biomedical applications. These include solar cells, energy storage, environmental control, tissue engineering, bioprobe, biomarking, cancer diagnosis, cancer therapy, and drug delivery. Our recent work covers a wide range of nanomaterials research for a variety of applications including to produce organic-inorganic nanocomposites which will be used in for constructing light emitting diodes, photovoltaic cells, future organic solar cells etc, biomedicine and photocatalytic. In this article the chief scientific and technical aspects of nanotechnology are introduced and some of its potential applications have been discussed.

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“…Polymer electrolytes containing a redox couple, i.e., triiodide/ iodide (I 3 − /I − ), have also been demonstrated to exhibit unique conducting properties that make them useful for solid state dye-sensitized solar cells (DSSCs) [4][5][6][7]. DSSCs, first proposed by Grätzel in 1991 [8], have attracted much interest in the last decade due to their low production cost and the low environmental impact of their fabrication.…”

Section: Introductionmentioning

confidence: 99%

Effect of oligomer on dye-sensitized solar cells employing polymer electrolytes

Ahn

Kim

Lee

et al. 2010

Korean J. Chem. Eng.

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The effect of oligomer (M n =400-500 g/mol) on dye-sensitized solar cells (DSSC) employing polymer electrolytes consisting of poly(epichlorohydrin-co-ethylene oxide) (Epichlomer), LiI, 1-methyl-3-propylimidazolium iodide (MPII) and I 2 is investigated. Five kinds of oligomer, poly(ethylene glycol) (PEG, M n =400 and 1,000 g/mol), poly(ethylene glycol) dimethyl ether (PEGDME), poly(propylene glycol) (PPG) and poly(ethylene glycol) diglycidyl ether (PEGDGE), were introduced to elucidate the role of terminal groups and chain length. The coordinative interactions and structures of polymer electrolytes were characterized by FT-IR spectroscopy and X-ray diffraction (XRD). The improved interfacial contact between the electrolytes and the electrodes by the oligomer addition was confirmed using a field-emission scanning electron microscope (FE-SEM). The electrolytes exhibited ionic conductivities on the order of 10 −4 S/cm, but PEGDGE electrolyte showed much lower value (~10 −8 S/cm). As a result, the energy conversion efficiency of DSSC was significantly affected by the oligomer. For example, the DSSC employing PEGDME with methyl terminal groups exhibited 3.95% at 100 mW/cm 2 , which is 200-fold higher than that employing PEGDGE.

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Enhancement of photocurrent generation and open circuit voltage in dye-sensitized solar cells using Li+ trapping species in the gel electrolyte

Cited by 69 publications

References 35 publications

Highly Efficient, Iodine‐Free Dye‐Sensitized Solar Cells with Solid‐State Synthesis of Conducting Polymers

Highly Efficient, Iodine‐Free Dye‐Sensitized Solar Cells with Solid‐State Synthesis of Conducting Polymers

Applications of nanomaterials in the different fields of photosciences

Effect of oligomer on dye-sensitized solar cells employing polymer electrolytes

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