Dissertation > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Photocell > Solar cells

The Research of the Dye-Sensitized Nanocrystalline TiO2 Solar Cells

Author LiaoHaiZuo
Tutor HaoYongDe
School Huazhong University of Science and Technology
Course Microelectronics and Solid State Electronics
Keywords Dye-sensitized solar cells TiO2 nanocrystals Anatase Hydrothermal method
CLC TM914.4
Type Master's thesis
Year 2011
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TiO 2 of dye -sensitized solar cells , caused widespread concern of researchers because of its simple, low-cost production and high theoretical conversion efficiency . This thesis is prepared using the sol-gel method and hydrothermal prepared TiO 2 film dye-sensitized cells using differential thermal analysis , scanning electron microscopy ( SEM ) , atomic force microscopy ( AFM ) , X -ray diffraction ( XRD) and measurement of the photoelectric conversion means , of preparation conditions on the performance of the battery photoelectric . Analysis of TiO 2 nano powder using sol-gel method , the powder without heat treatment amorphous powder after 300 ° C heat treatment of anatase , 600 ° C heat treatment after the powder began Some of the rutile type. The average grain size of the powder increases with increasing heat treatment temperature , the average grain size is by 300 ℃ 17.58nm increases to 800 ℃ 49.55nm ; using the sol-gel method nano- TiO 2 < / sub> powder, and then preparing the films by 450 ° C heat treatment after 30min the assembled dye-sensitized cells , IV test system measuring learned , to get the maximum open circuit voltage and short circuit current , respectively, 0.53V , 5.11mA/cm2 . Studied TiO 2 nano powder for the raw material of the solar cell obtained by the hydrothermal method , found trace increases effect increasing of Ti4 concentrations on the cell conversion efficiency ; Sui of TiO 2 < / sub> increase of film thickness of the photoelectric conversion efficiency of the battery , improve the conversion efficiency will be reduced in a certain value is reached , continue to increase in thickness , up to a maximum of 4.09% when the photoelectric efficiency in a film thickness of 9.3μm ; the use of sodium hydroxide solution Water heat treatment the obtained TiO 2 powder to prepare a thin film battery, the photoelectric conversion efficiency of the battery prepared in a certain improvement, up to 4.16% . The results show that the prepared TiO 2 process can be optimized by increasing the concentration of the titanium source , alkali treatment of TiO 2 crystal structure or surface morphology , thereby improving the dye-sensitized performance of photovoltaic solar cells . Further, it is also possible to improve the conversion efficiency of the battery through the control of film thickness .

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