题目1：
Quantum-Dot Based Photo-Electrochemical Solar Cells
报告人1：
Prof. Arie Zaban
(Chemistry Department, Institute for Nanotechnology and Advanced Materials, Bar Ilan University)
题目2：
Novel Synthetic Strategy for Molecular Photovoltaics
报告人2：
Hiroshi Imahori
(Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University)
联系人：
林红老师 62772672
欢迎广大师生踊跃参加
Prof. Arie Zaban - CV
Arie Zaban was born in Israel in 1961. He earned a B.Sc. in Chemistry (summa cum laude) and a Ph.D. in Electrochemistry (with highest distinction) at Bar-Ilan University (1987-1995). After a 2 year postdoctoral stint at the US National Renewable Energy Laboratory (Denver, CO), he was appointed to the senior faculty at Bar-Ilan (1998), where he is currently a Full Professor of Chemistry and Director of the Bar Ilan Institute for Nanotechnology and Advanced Materials.
Prof. Zaban has published over 110 papers in refereed journals, 3 book chapters, and 35 invited lectures. He has 10 patents out of which 7 are commercialized in three start-up companies. All papers and patents are energy related (photovoltaics, batteries, materials for energy conversion and storage). Prof. Zaban is a member of the Israeli government advisory committee on alternative fuels and vice chair of the Solar Energy Solution consortium (Magnet Program). Prof. Zaban has been awarded several prizes and fellowships such as the Israel Chemical Society Prize for Outstanding Young Scientist, a Rothschild Fellowship, a Levi Eshkol Scholarship and the Michael Landau Research Prize in Renewable Energy. His research interests are in the fields of photo-electrochemistry and materials science, with a focus on renewable energy resources.
Novel Synthetic Strategy for Molecular Photovoltaics
Hiroshi Imahori
Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Kyoto, Japan
imahori@scl.kyoto-u.ac.jp
Solar energy conversion is a long-term research interest, and a variety of photovoltaic and/or photoelectrochemical devices have been explored. In this talk I will present our synthetic concepts toward efficient solar energy conversion.
Donor-acceptor (D-A) molecules have been fabricated on a nanostructured semiconducting electrode for solar energy conversion (i.e., dye-sensitized bulk heterojunction solar cell) [1-3]. The hybrid device structure is similar to that of dye-sensitized solar cells (DSSC), but the top surface of the nanostructured semiconducting electrode is covered with D-A multilayers. Thus, initial charge separation takes place at the blend interface of the D-A, which is typical characteristic of bulk heterojunction solar cells, whereas subsequent processes resemble those in DSSC. In this novel solar cell, donor-nanocarbons (i.e., fullerenes and carbon nanotubes) have been successfully deposited electrophoretically or spin-coated onto nanostructured SnO2, TiO2, and ZnO electrodes that exhibit efficient photocurrent generation. The bottom-up self-organization of porphyrin and fullerene molecules onto the nanostructured SnO2 electrodes has led to moderate cell performance with an incident photon-to-current efficiency (IPCE) up to 60% and a power conversion efficiency (h) up to 2%.
Single-walled carbon nanotubes (SWNTs) modified chemically with porphyrins or fullerenes have also been deposited electrophoretically on nanostructured SnO2 electrodes [4,5]. In particular, we have successfully constructed nanocarbon composites, where C70 molecules are aligned on the sidewall of SWNTs for the first time. The C70–SWNT photoelectrochemical device exhibited the highest IPCE value (26%) ever reported for analogous SWNT-based photoelectrochemical devices. The highest IPCE value results from selective formation of the composite film consisting of the SWNT network covered with C70 molecules, which is in marked contrast with the unselective formation of three different clusters in the C60–SWNT composites. Thus, these results will provide basic clue for the design of nanocarbon composite-based molecular devices including organic photovoltaics.
So far ruthenium(II) bipyridyl complexes have proven to be the most efficient TiO2 sensitizers in DSSC. However, stagnation in the highest h value has been recognized in the last decade. More importantly, considering that ruthenium is rare metal, novel dyes without metal or using inexpensive metal are desirable for highly efficient DSSC. Porphyrins are an important class of potential sensitizers for highly efficient DSSC owing to their photostability and high light-harvesting capabilities that can allow applications in thinner, low-cost DSSC. Porphyrins possess an intense Soret band at 400 nm and moderate Q bands at 600 nm. Nevertheless, the poor light-harvesting properties relative to the ruthenium complexes have limited the cell performance of porphyrin-sensitized TiO2 cells. Elongation of the p-conjugation and loss of symmetry in porphyrins cause broadening and redshift of the absorption bands together with an increasing intensity of the Q bands relative to that of the Soret band. On the basis of the strategy, the cell performance of porphyrin-sensitized solar cells has been improved intensively by the enhanced light absorption. Actually, some push-pull type porphyrins have disclosed a remarkably high h value (6-7%) that was close to that of the ruthenium complexes [6].
[1] J. Am. Chem. Soc., 131, (2009) 3198. [2] J. Phys. Chem. C (Feature Article), 113, (2009) 9029. [3] J. Phys. Chem. Lett. (Perspective), 1, (2010) 1020. [4] Energy Environ. Sci. (Perspective), 1, (2008) 120. [5] Adv. Mater. 22, (2010) 1767. [6] Acc. Chem. Res. 42, (2009) 1809.
Hiroshi Imahori - CV
Name: Hiroshi Imahori
Address: Department. of Molecular Engineering, Graduate School of Engineering and Institute for Integrated Cell-Material Sciences, Kyoto University, Japan
Education and Academic Positions:
1981-1985: Undergraduate student, Department of Chemistry, Faculty of Science, Kyoto University, Kyoto, Japan, majored in Organic Chemistry.
1985-1987: Graduate student, under the supervision of Prof. Kazuhiro Maruyama, Department of Chemistry, Faculty of Science, Kyoto University, Kyoto, Japan, majored in Organic Chemistry.
1987-1990: Doctoral graduate, under the supervision of Prof. Kazuhiro Maruyama, Department of Chemistry, Faculty of Science, Kyoto University, Kyoto, Japan, majored in Organic Chemistry.
1990-1992: Postdoctoral Fellow, The Salk Institute for Biological Studies, San Diego, CA, USA, on development of in vitro selection systems for RNA catalyst using polymerase chain reaction (PCR) technique.
1992-1999: Assistant Professor, Institute of Scientific and Industrial Research, Osaka University, Japan, on the Development of super- and supra-molecular biomimetic systems for artificial photosynthesis.
1999-2002: Associate Professor, Department of Material and Life Science, Graduate School of Engineering, Osaka University, Japan, on the Development of super- and supra-molecular biomimetic systems for artificial photosynthesis.
2002-Present: Full Professor, in the Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Japan and Fukui Institute for Fundamental Chemistry, Kyoto University, Japan, on the Development of super- and supra-molecular biomimetic systems for artificial photosynthesis and organic solar cells.
2007-Present: Full Professor, in Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University,, Japan on the Development of Integrated Cell-Material Sciences.
Research interests:
Design and synthesis of super- and supra-molecular biomimetic systems for artificial photosynthesis, photochemistry and photophysics, photoinduced electron transfer and energy transfer, organic synthesis, porphyrins, phthalocyanines, fullerenes, carbon nanotubes, graphenes, nanoparticles, polymers, self-assembly, photonic molecular devices, organic solar cells (dye-sensitized solar cells, bulk heterojunction solar cells, novel organic solar cells), and drug delivery systems.
Prize
1. Young Investigator Award from the Society of Porphyrins and Phthalocyanines (2002)
2. Japanese Photochemistry Association Prize (2004)
3. JSPS (Japan Society for the Promotion of Science) Prize (2006)
4. CSJ (Chemical Society of Japan) Award for Creative Work (2006)
5. Tokyo Techno Forum 21 Gold Medal Prize (2007)
6. Osaka Science Prize (2007)
7. NISTEP (National Institute of Science and Technology Policy) Researcher Award (2007)
Others
1. Member of Screening Committee, Nissan Science Foundation (2004-2010)
2. Editorial Advisory Board, Fullerenes, Nanotubes, and Carbon Nanostructures, Taylor-Francis (2005)
3. Member of Executive Committee of FNCN Division (Fullerenes, Nanotubes, and Carbon Nanostructures), the Electrochemical Society, USA (2006)
4. Associate Member of SCJ (Science Council of Japan) (2006-2008)
5. International Advisory Board, ChemSusChem, Wiley-VCH (2007)
6. Advisory Board, The Journal of Physical Chemistry, ACS (2009)
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