Photovoltaics Based on Hybridization of Effective Dye‐Sensitized Titanium Oxide and Hole‐Conductive Polymer P3HT

Jiang, Ke‐Jian; Manseki, Kazuhiro; Yu, Youhai; Masaki, N; Suzuki, Kazuharu; Song, Yanlin; Yanagida, Shozo

doi:10.1002/adfm.200900283

Cited by 122 publications

(89 citation statements)

References 31 publications

(59 reference statements)

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“…mesoporous fi lms with polymers, [ 7 ] combined with the previously postulated poor charge transport of P3HT in random mesoporous channels. [ 8 ] Two similar studies from Jiang et al [ 1 ] and from Zhu et al [ 2 ] on P3HT based DSSCs showed that the addition of lithium salts and tert-butyl pyridine signifi cantly increased the effi ciency in presence of a metal-free organic dye. The origin of this improvement is ascribed in one instance to a slight deepening of the dye HOMO level upon the addition of lithium salts enhancing the hole-transfer effi ciency, [ 9 ] and in the other case to be due to enhanced charge separation effi ciency.…”

Section: Infl Uence Of Ion Induced Local Coulomb Field and Polarity Omentioning

confidence: 93%

Influence of Ion Induced Local Coulomb Field and Polarity on Charge Generation and Efficiency in Poly(3‐Hexylthiophene)‐Based Solid‐State Dye‐Sensitized Solar Cells

Abrusci

Kumar

Al‐Hashimi

et al. 2011

Adv Funct Materials

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Dye‐sensitized solar cells (DSSC) are a realistic option for converting light to electrical energy. Hybrid architectures offer a vast materials library for device optimization, including a variety of metal oxides, organic and inorganic sensitizers, molecular, polymeric and electrolytic hole‐transporter materials. In order to further improve the efficiency of solid‐state dye‐sensitized solar cells, recent attention has focused on using light absorbing polymers such as poly(3‐hexylthiophene) (P3HT), to replace the more commonly used “transparent” 2,2′,7,7′‐tetrakis‐(N,N‐di‐p‐methoxyphenyl‐amine)9,9′spiro‐bifluorene (spiro‐OMeTAD), in order to enhance the light absorption within thin films. As is the case with spiro‐OMeTAD based solid‐state DSSC, the P3HT‐based devices improve significantly with the addition of lithium bis(trifluoromethylsulfonyl)imide salts (Li‐TFSI), although the precise role of these additives has not yet been clarified in solid‐state DSCs. Here, we present a thorough study on the effect of Li‐TFSI in P3HT based solid‐state DSSC incorporating an indolene‐based organic sensitizer termed D102. Employing ultrafast transient absorption and cw‐emission spectroscopy together with electronic measurements, we demonstrate a fine tuning of the energetic landscape of the active cell components by the local Coulomb field induced by the ions. This increases the charge transfer nature of the excited state on the dye, significantly accelerating electron injection into the TiO2. We demonstrate that this ionic influence on the excited state energy is the primary reason for enhanced charge generation with the addition of ionic additives. The deepening of the relative position of the TiO2 conduction band, which has previously been thought to be the cause for enhanced charge generation in dye sensitized solar cells with the addition of lithium salts, appears to be of minor importance in this system.

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Section: Infl Uence Of Ion Induced Local Coulomb Field and Polarity Omentioning

confidence: 93%

Influence of Ion Induced Local Coulomb Field and Polarity on Charge Generation and Efficiency in Poly(3‐Hexylthiophene)‐Based Solid‐State Dye‐Sensitized Solar Cells

Abrusci

Kumar

Al‐Hashimi

et al. 2011

Adv Funct Materials

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“…[ 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 ).…”

mentioning

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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“…The result indicated that the dye/spiro-OMeTAD interfaces are self-organized by oleophilic interaction resulting in improved photocurrent and efficiency. Similarly, Jiang et al [74] also reported the dyes with oleophilic thienyl groups, which show power conversion efficiency of up to 2.7%. Such improvement in PCE is also believed because of self-organized interface between dye molecules and polymer material.…”

Section: Solid-state Dye-sensitized Solar Cell Using Conjugated Polymmentioning

confidence: 79%

“…Various triarylamine-based polymers [60][61][62][63], poly(3-alkylthiophene)s [64][65][66][67][68][69][70][71][72][73][74][75][76], polypyrrole [77][78][79][80], polyaniline [81][82][83][84][85], are studied as HTMs in solid-state DSSCs. The polymers cast from solutions must penetrate into the pores between the nanoparticles and should form a good contact with the absorbed dye.…”

Section: Solid-state Dye-sensitized Solar Cell Using Conjugated Polymmentioning

confidence: 99%

Similar Device Architectures for Inverted Organic Solar Cell and Laminated Solid-State Dye-Sensitized Solar Cells

et al. 2012

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Here, we examine the device architecture of two different types of solar cells mainly inverted organic solar cells and solid state dye-sensitized solar cells (DSSCs) that use organic materials as hole transportation. The inverted organic solar cells structure is dominated by work on titanium dioxide (TiO 2 ) and zinc oxide (ZnO). These layers are sensitized with dye in solid state DSSCs. Because of the similar device architecture, it becomes possible to fabricate laminated solid-state DSSCs. The performance of the device was improved by varying the top metal electrode. In laminated solid-state DSSC, we expect that excited dye molecules inject electron into the conduction band of nanocrystalline TiO 2 layer, whereas P3HT provides efficient hole transportation. These solar cells are promising for future energy source as they are cheaper, light weight, flexible and made into large areas, which are showing growing importance.

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Photovoltaics Based on Hybridization of Effective Dye‐Sensitized Titanium Oxide and Hole‐Conductive Polymer P3HT

Cited by 122 publications

References 31 publications

Influence of Ion Induced Local Coulomb Field and Polarity on Charge Generation and Efficiency in Poly(3‐Hexylthiophene)‐Based Solid‐State Dye‐Sensitized Solar Cells

Influence of Ion Induced Local Coulomb Field and Polarity on Charge Generation and Efficiency in Poly(3‐Hexylthiophene)‐Based Solid‐State Dye‐Sensitized Solar Cells

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

Similar Device Architectures for Inverted Organic Solar Cell and Laminated Solid-State Dye-Sensitized Solar Cells

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