@phdthesis{oai:kyutech.repo.nii.ac.jp:00004329,
 author = {Azwar, Hayat},
 month = {2016-01-21},
 note = {1. Introduction||2. Dye-sensitized Solar cells||3. Experiment and Measurements||4. DSSCs based on axially ligated phosphorus-phthalocyanine dyes||5. TCO free Dye sensitized solar cell using flat Titanium sheet||6. Conclusions and future prospects, Current world population has reached 7.3 billion. With this huge population, demand ofenergy is rapidly increased. The standard of living is also growing, which increases demandof energy in near future. Fossil fuels are currently the main resource to provide energy whichare not unlimited. Problems on fossil fuels energy are not only lack of resource but alsocreating the environmental problems. Oil based energy waste such as carbon monoxide (CO)and carbon dioxide (CO2) block heat in atmosphere and accelerate earth surface temperatureto trigger global warming. From this point of view, we need a suitable energy substitute assoon as possible.Dye sensitized solar cell (DSSC) using the principle of natural photosynthesis are nowcurrently at the verge of commercialization having similar photoconversion efficiency ascompared to amorphous silicon solar cells. DSSCs or well known as Gr?tzel cells, consist ofn-type semiconductor such as titanium dioxide (TiO2), tungsten oxide (WO3), zinc oxide(ZnO) or tin dioxide (SnO2), with the light absorber. The structure is different from all solarcell mentioned above where light is being absorbed by the semiconductor materials itself.Relatively low cost and easy manufacturing process make DSSCs one of candidates forfuture solar energy resources. DSSCs reached up to 13% of efficiency in recent days. Thereare several barriers in DSSCs commercialization, for instance, utilization of only visibleregion of solar spectra, high cost of transparent conductive Oxide (TCO) glass, and so on.Our final goals are to extend the photo sensitivity of DSSCs to far-red and NIR area, tochange the structure of DSSCs into back-contact DSSC in order to totally remove the TCOparts, and to fabricated cylindrical structure for harvesting more light in a day and decreasingwind resistance.Chapter 1 deals with our research motivation, kinds of renewable energy, review aboutphotovoltaics cell and propose of our present work. In chapter 2, the detail about the structureand working principle of DSSCs are discussed. The main components in DSSCs areexplained in details and barriers of DSSCs commercialization also are discussed. In chapter3, the DSSCs characteristics and cells performance calculation are deliberated. Allexperiments conducted in this thesis are described in this chapter.Chapter 4 described the new dyes. Phosphorus-phthalocyanine dye was used to cover IR region. Without conventional anchoring groups such as carboxylic acid (-COOH), phosporusphthalocyaninedyes could be attached onto titania surface with P-O-Ti linkage. Furthermore,modification of the side chain at α-position of the sensitizer was done to optimize theHOMO-LUMO level.In chapter 5, novel DSSC structure are discussed. Titanium sheet with micro holes (FTSMH)was utilized as photo-anode and as counter electrode to completely eliminate TCO fromDSSCs in flat as well as in cylinder structure. In flat back-contact DSSC, hydrogen peroxidetreatment was used to modifu the titanium surface to make TiO2 nanosheets, which leads toenhancement of short circuit current and open circuit voltage. Reduction of electrolytic gapwas carried out to optimize IPCE in 300-400 nm wavelength region. In cylindrical structure,TCO-less cylinder DSSCs ware fabricated by folding the FTS-MH sheet and Ti-basedcounter electrode and inserted into heat shrinkable tubes. It was proved that the processenhanced the photovoltaic performance to the cylinder DSSC.In last chapter we discuss about results and further optimizations prospect from currentworks and hopefully help researcher and industry to accelerate commercialization of DSSCsin near future., 九州工業大学博士学位論文 学位記番号:生工博甲第242号 学位授与年月日:平成27年9月25日, 平成27年度},
 school = {九州工業大学},
 title = {Investigation of Novel Dye Anchoring and Devices Architecture for Aiming at Dye-sensitized Solar Cells with High Efficiency},
 year = {}
}