Study of Ultrathin Films of P3HT/PCBM by Means of Highly Sensitive Absorption Spectroscopy

Yaguchi, Kaori; Furube, Akihiro; Katoh, Ryuzi

doi:10.1246/cl.2012.184

Cited by 3 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The thickness of the P3HT layer, calculated using the absorbance and absorption coefficient of the P3HT films, was approximately 80100 nm. 58 As previously reported, 59 the photocurrent value from the P3HT film of the active layer in the OSCs increased with an increase in the thickness of the P3HT layer, up to approximately 100 nm.…”

Section: Immersionsupporting

confidence: 67%

Facile Fabrication and Photovoltaic Application of [60]Fullerene Assembly Films Formed by Reaction between Fullerene and Amines

Banya

Akiyama

Matsumoto

et al. 2014

Bulletin of the Chemical Society of Japan

View full text Add to dashboard Cite

[60]Fullerene assembly films consisting of C 60 and 1,2-diaminoethane (ethylenediamine) were easily fabricated on an amino-group-modified substrate by an alternate immersion process. The C 60 -assembly film was characterized after confirming the film formation using transmission absorption spectroscopy, transmission electron microscopy, atomic force microscopy, and X-ray photoelectron spectroscopy. An inverted-type organic solar cell was fabricated by using the C 60 -assembly film as the acceptor layer in the photoactive layer of the solar cell. The resultant photoelectric conversion performances of the solar cells were evaluated using the photocurrent and photovoltage via the photoexcitation of polythiophene. The results suggested that the fabricated C 60 -assembly film works as an n-type semiconductor for polythiophene.Fullerenes are suitable as electron acceptor components in organic solar cells (OSCs), 1,2 artificial photosynthesis models, 35 and organic transistors; 68 they are highly attractive as organic n-type semiconductors. One of the reasons that fullerenes are efficient electron acceptors is their small reorganization energy in electron transfer. 911In OSCs, organic electronic material based photovoltaic devices such as dye-sensitized and organic thin-film solar cells have gained attention in novel renewable energy source applications because of their potential for low-cost, lightweight, and large-area processability.1214 Indeed, the carrier mobility of the organic films of the active layer is an important factor in the photoelectric conversion performance. 15,16 Controlling the orientation of fullerene assemblies is vital for fabricating useful fullerene-based n-type (acceptor) organic electronic materials. 1719 In particular, adjacent or aggregated fullerene structures seem to be suitable for fabricating n-type organic semiconductor materials or electron acceptor materials with high negative carrier mobilities. 2030 The number of fullerene derivatives exhibited as organic electronic materials is still limited compared with the number of donor material. 3133 Therefore, developing and improving a facile preparation method for fullerene derivatives is very important for the development of organic electronic materials.Additionally, the quality of the electric contact between the organic layer and the electrodes is one of the most important factors in determining device performance. 3439 One approach to improving the OSC performance is to modify C 60 -based selfassembled monolayers (C 60 -SAMs) at the interface between the inorganic and organic materials. 40,41 These C 60 -SAMs help suppress charge recombination between photoinduced holes and electrons at the inorganic/organic interface by preventing carrier trapping, as well as improving the photoinduced charge transfer properties.In relation to the above, one of the simplest chemical modification methods for the preparation of fullerene derivatives is an addition reaction between fullerenes and amines. 42,43 As the preparation method for C 60 -...

show abstract

Section: Immersionsupporting

confidence: 67%

Facile Fabrication and Photovoltaic Application of [60]Fullerene Assembly Films Formed by Reaction between Fullerene and Amines

Banya

Akiyama

Matsumoto

et al. 2014

Bulletin of the Chemical Society of Japan

View full text Add to dashboard Cite

show abstract

“…Absorption spectra of the dye-sensitized nanocrystalline films were measured with a conventional absorption spectrometer (V-670, JASCO). Because absorption by the dye-sensitized single crystals was weak (<10 – 3), we used a highly sensitive homemade absorption spectrometer that is similar to an instrument described previously . A 40 W halogen lamp was used as the light source.…”

Section: Methodsmentioning

confidence: 99%

“…Because absorption by the dye-sensitized single crystals was weak (<10 − 3), we used a highly sensitive homemade absorption spectrometer that is similar to an instrument described previously. 24 A 40 W halogen lamp was used as the light source. Monochromatic light obtained with a monochromator (SP-150, Acton) was transmitted through the sample placed on a motorized linear stage controlled with a computer.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Effect of Adsorbed Water Molecules on Light Harvesting and Electron Injection Processes in Dye-Sensitized Nanocrystalline TiO₂ Films

et al. 2017

Self Cite

View full text Add to dashboard Cite

We studied the effects of adsorbed water molecules on light harvesting and electron injection processes in nanocrystalline TiO2 films sensitized with Ru-complex dyes. We found that the absorption spectra of adsorbed dyes containing SCN groups were sensitive to humidity (that is, the dyes exhibited vapochromism) and that the absorption spectra of dyes adsorbed on nanocrystalline films differed slightly from the spectra of the same dyes adsorbed on TiO2 single crystals, suggesting that the orientation of the dye molecules on the surface was affected by surface-adsorbed water molecules. The dynamics of electron injection from the excited dye molecules into the TiO2 were studied by transient absorption spectroscopy. Transient absorption signal intensities decreased with decreasing humidity, indicating that electron injection efficiency was reduced by loss of water molecules from the surface. IR spectroscopy indicated that only a small amount of physisorbed water was lost upon drying, and the use of an indicator dye showed that the proton concentration around the dye molecules on the surface was markedly increased by drying. On the basis of these findings, we discuss possible mechanisms for the vapochromism and for the reduction in electron injection efficiency caused by the loss of water molecules from the surface.

show abstract

Fabrication and photocurrent generation properties of C ₆₀ -ethylenediamine adduct microparticles film modified with poly(3-hexylthiophene-2,5-diyl)

Tanaka,

Kanbe,

Banya

et al. 2024

Molecular Crystals and Liquid Crystals

View full text Add to dashboard Cite

Study of Ultrathin Films of P3HT/PCBM by Means of Highly Sensitive Absorption Spectroscopy

Cited by 3 publications

References 11 publications

Facile Fabrication and Photovoltaic Application of [60]Fullerene Assembly Films Formed by Reaction between Fullerene and Amines

Facile Fabrication and Photovoltaic Application of [60]Fullerene Assembly Films Formed by Reaction between Fullerene and Amines

Effect of Adsorbed Water Molecules on Light Harvesting and Electron Injection Processes in Dye-Sensitized Nanocrystalline TiO₂ Films

Fabrication and photocurrent generation properties of C ₆₀ -ethylenediamine adduct microparticles film modified with poly(3-hexylthiophene-2,5-diyl)

Contact Info

Product

Resources

About

Study of Ultrathin Films of P3HT/PCBM by Means of Highly Sensitive Absorption Spectroscopy

Cited by 3 publications

References 11 publications

Facile Fabrication and Photovoltaic Application of [60]Fullerene Assembly Films Formed by Reaction between Fullerene and Amines

Facile Fabrication and Photovoltaic Application of [60]Fullerene Assembly Films Formed by Reaction between Fullerene and Amines

Effect of Adsorbed Water Molecules on Light Harvesting and Electron Injection Processes in Dye-Sensitized Nanocrystalline TiO2 Films

Fabrication and photocurrent generation properties of C 60 -ethylenediamine adduct microparticles film modified with poly(3-hexylthiophene-2,5-diyl)

Contact Info

Product

Resources

About

Effect of Adsorbed Water Molecules on Light Harvesting and Electron Injection Processes in Dye-Sensitized Nanocrystalline TiO₂ Films

Fabrication and photocurrent generation properties of C ₆₀ -ethylenediamine adduct microparticles film modified with poly(3-hexylthiophene-2,5-diyl)