Photoelectrochemical properties of donor-acceptor nanocomposite films composed of porphyrin-functionalized cup-shaped nanocarbon materials

2010 ◽  
Vol 14 (05) ◽  
pp. 452-458 ◽  
Author(s):  
Masataka Ohtani ◽  
Shunichi Fukuzumi
Keyword(s):  
Photovoltaic Cells ◽  
Visible Region ◽  
Nanocomposite Films ◽  
Photoelectrochemical Properties ◽  
Deposition Method ◽  
Photoelectrochemical Performance ◽  
Time Resolved ◽  
Photocurrent Generation ◽  
Nanocarbon Materials ◽  
Donor Acceptor

Porphyrin-functionalized cup-shaped nanocarbons (CNC-H2P) have been assembled onto nanostructured SnO2 films using an electrophoretic deposition method to examine the photoelectrochemical properties. The obtained CNC-H2P nanohybrid films were examined by a series of steady-state and time-resolved spectroscopic measurements and photoelectrochemical measurements. The resulting nanohybrid film afforded drastic enhancement in the photoelectrochemical performance as well as broader photoresponse in the visible region as compared with the reference CNC system without porphyrins. The enhancement of photocurrent generation may be caused by the efficient electron injection from the long-lived charge-separated state of CNC-H2P upon photoexcitation. This feature makes cup-shaped nanocarbon materials a useful candidate for developing efficient photoelectrochemical and photovoltaic cells.

Photoelectrochemical properties of supramolecular composites of an anionic zinc chlorin and Li+@C60 on SnO2

2014 ◽  
Vol 18 (10n11) ◽  
pp. 982-990 ◽  
Author(s):  
Kei Ohkubo ◽  
Yuki Kawashima ◽  
Kentaro Mase ◽  
Hayato Sakai ◽  
Taku Hasobe ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Photoinduced Electron Transfer ◽  
Photovoltaic Cells ◽  
Lithium Ion ◽  
Transparent Electrode ◽  
Supramolecular Complex ◽  
Photoelectrochemical Properties ◽  
Triplet Excited State ◽  
Optically Transparent ◽  
Donor Acceptor

An electron donor–acceptor supramolecular complex was formed between an anionic zinc chlorin carboxylate ( ZnCh -) and lithium-ion-encapsulated [60]fullerene ( Li +@ C 60) by an electrostatic interaction in benzonitrile ( PhCN ). Photoinduced electron transfer in the supramolecular complex of ZnCh -/ Li +@ C 60 resulted in the formation of the charge-separated state via electron transfer from the triplet excited state of ZnCh - to Li +@ C 60. We report herein photovoltaic cells using ZnCh -/ Li +@ C 60 nanoclusters, which are assembled on the optically transparent electrode (OTE) of nanostructured SnO 2 (OTE/ SnO 2). The photoelectrochemical behavior of the nanostructured SnO 2 film of supramolecular nanoclusters of ZnCh - and Li +@ C 60 denoted as OTE/ SnO 2/( ZnCh -/ Li +@ C 60)n is significantly higher than the single component films of ZnCh - or Li +@ C 60 clusters, denoted as OTE/ SnO 2/( ZnCh -)n or OTE/ SnO 2/( Li +@ C 60)n.

scholarly journals Effect of Ce Doping on RGO-TiO2Nanocomposite for High Photoelectrocatalytic Behavior

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Md. Rakibul Hasan ◽  
Chin Wei Lai ◽  
Sharifah Bee Abd Hamid ◽  
Wan Jeffrey Basirun
Keyword(s):  
Composite Film ◽  
Sol Gel ◽  
Composite Films ◽  
Visible Region ◽  
Rutile Phase ◽  
Nanocomposite Films ◽  
Tetrabutyl Titanate ◽  
Photoelectrochemical Performance ◽  
Solar Simulator ◽  
Fourier Transformed Infrared Spectroscopy

Ce doped RGO-TiO2composite films on ITO substrates were prepared by sol-gel process using tetrabutyl titanate and reduced graphene oxide (RGO) as the starting materials. The sample was designed for the photoelectrocatalytic applications. The obtained samples were characterized by X-ray diffraction, UV-vis absorption spectroscopy, scanning electron microscopy, and Fourier transformed infrared spectroscopy. The results showed that doping of Ce on RGO-TiO2composite film inhibited the TiO2anatase-rutile phase transformation. In this case, Ce atoms could serve as dispersion oxide and suppress the recombination of photoinduced electron-hole pairs. Besides, the change in absorbance from UV to visible region was observed in Ce doped RGO-TiO2nanocomposite films. The Ce doped RGO-TiO2composite film showed higher photoelectrochemical performance than that of RGO-TiO2composite and pure TiO2under solar simulator irradiation. The main reason might be attributed to the optimum content of Ce that could act as electrons acceptor to hinder the recombination loss and facilitate the better transportation for photoinduced charge carriers.

scholarly journals Time-resolved Spectroscopy of the violet luminescence of undoped AlN

2005 ◽  
Vol 10 ◽  
Author(s):  
R. Freitag ◽  
K. Thonke ◽  
R. Sauer ◽  
D. G. Ebling ◽  
L. Steinke
Keyword(s):  
Epitaxial Layers ◽  
Yellow Luminescence ◽  
Acceptor Pair ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Violet Luminescence ◽  
Donor Acceptor ◽  
Violet Band ◽  
Donor Acceptor Pair

We report on the time-resolved luminescence of the defect-related violet band from undoped AlN epitaxial layers grown on sapphire and SiC. For both measurements in photoluminescence and in cathodoluminescence a decay of algebraic nature at long times is observed. This is typical for donor-acceptor pair transitions. We compare the behavior of this band to that of the generically yellow luminescence of GaN.

Improving Photocurrent Generation: Supramolecularly and Covalently Functionalized Single-Wall Carbon Nanotubes-Polymer/Porphyrin Donor-Acceptor Nanohybrids

2008 ◽  
Vol 14 (29) ◽  
pp. 8837-8846 ◽  
Author(s):  
G. M. Aminur Rahman ◽  
Anna Troeger ◽  
Vito Sgobba ◽  
Dirk M. Guldi ◽  
Norbert Jux ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Photocurrent Generation ◽  
Donor Acceptor

Supramolecular Donor−Acceptor Heterojunctions by Vectorial Stepwise Assembly of Porphyrins and Coordination-Bonded Fullerene Arrays for Photocurrent Generation

2009 ◽  
Vol 131 (9) ◽  
pp. 3198-3200 ◽  
Author(s):  
Aiko Kira ◽  
Tomokazu Umeyama ◽  
Yoshihiro Matano ◽  
Kaname Yoshida ◽  
Seiji Isoda ◽  
...  
Keyword(s):  
Photocurrent Generation ◽  
Donor Acceptor ◽  
Stepwise Assembly

Impact of fluorinated end groups on the properties of acceptor–donor–acceptor type oligothiophenes for solution-processed photovoltaic cells

2014 ◽  
Vol 2 (7) ◽  
pp. 1337-1345 ◽  
Author(s):  
Guangrui He ◽  
Xiangjian Wan ◽  
Zhi Li ◽  
Qian Zhang ◽  
Guankui Long ◽  
...  
Keyword(s):  
Photovoltaic Cells ◽  
Solution Processed ◽  
End Groups ◽  
Donor Acceptor
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