05/02專題演講公告

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上層分類：系所公告

分類：演講

建立於 2016-04-26, 週二 12:04

最近更新於 2016-04-26, 週二 12:20

發佈於：2016-04-26, 週二 12:20

點擊數：2527

演講人：闕郁倫 博士

演講題目：低維奈米結構材料於太陽能發電及儲能應用

 

演講人：闕郁倫 博士

服務單位：清華大學材料系

演講題目：低維奈米結構材料於太陽能發電及儲能應用

演講時間：105.05.02 10:20~12:10

演講地點：工綜館203室

 

演講摘要：

 

       In this talk, I will introduce the development of low dimensional nanomaterials in my group and its applications on Cu(In, Ga)Se₂ solar cell. The direct formation of large area Cu(In,Ga)Se₂ nanotip arrays (CIGS NTRs) by using one step Ar⁺ milling process without template. By controlling milling time and incident angles, the length of CIGS NTRs with adjustable tilting orientations can be precisely controlled. Formation criteria of these CIGS NTRs have been discussed in terms of surface curvature, multiple components, and crystal quality, resulting in a highly anisotropic milling effect. In addition to physical approach to form nanostructures on the CIGS film, a reactive mold-assisted chemical etching (MACE) process through an easy-to-make agarose stamp soaked in bromine methanol etchant to rapidly imprint larger area micro- and nano- arrays on CIGS substrates was demonstrated in my group. Interestingly, by using the agarose stamp during the MACE process with and without additive containing oil and triton, CIGS microdome and microhole arrays can be formed on the CIGS substrate. In addition, i will introduce Au NPs to achieve efficiency enhancement of CIGS flexible photovoltaic devices. The incorporation of Au NPs can eliminate the obstacles in the way of developing ink-printing CIGS flexible TFPV, such as the poor absorption at wavelengths in high intensity region of solar spectrum, and that occurs at large incident angle of solar irradiation. The enhancement of external quantum efficiency and photocurrent have been systematically analyzed via the calculated distributions of electric field. Finally, the major benefits the LSPR in shorter wavelength have been investigated by ultrabroadband pump-probe spectroscopy, which gives a solid evidence on the strong absorption and reduction of surface recombination that increases electron-hole generation and improves the carrier transportation in the vicinity of pn-juction. These results suggest a promising way for rapidly improving the performance of CIGS flexible photovoltaic devices with low-cost.

 

    In the secondary part of my talk, an enhanced heat capacity of modified HITEC molten salt by doping of metal NPs will be reported. We encapsulate the Tin alloy into Sn/SiO_x core-shell NPs to prevent mixture with salt when operation temperature is higher than the melting point of Tin. The SiOx shell layer can protect the Sn NPs to be oxidized and maintains a melted status during the heat cycles, providing a stable leant heat value of 28.36 J/g. Besides, effective heat capacity of HITEC salt with Sn/SiOx core-shell NPs can be enhanced to be 30 % a mixture percentage of 5 wt%. The merits of this approach show a low-cost and easy way to enhance the thermal properties of current molten salt without complicated manufacturing.

 

個人學經歷：

 

學歷

 

畢業學校	國別	主修學門系所	學位
國立清華大學	中華民國	材料所	博士
國立清華大學	中華民國	材料所	碩士
國立中山大學	中華民國	物理學系	學士

 

經歷：

 

服務機關	服務部門	職稱
現職:
國立清華大學	材料科學工程學系(所)	教授
經歷:
國立清華大學	材料科學工程學系(所)	副教授
國立清華大學	材料科學工程學系(所)	助理教授
美國加州大學柏克萊分校校	電子工程研究系	博士後研究員