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標題: | 光電化學分解水和太陽能電池之表面和介面改善 The surface and interface modification for photoelectrochemical water splitting and solar cells |
作者: | Ding-Shiun Tu 涂定勲 |
指導教授: | 吳志毅(Chih-I Wu) |
關鍵字: | 光電化學分解水,太陽能電池,表面,介面, photoelectrochemical,water splitting,solar cells, |
出版年 : | 2014 |
學位: | 博士 |
摘要: | 表面和介面改善對於材料的應用特性有極大的影響。在本論文中嘗試使用兩種不一樣的表面處理來改善氮化鎵光電化學分解水的效能。在p-型氮化鎵上,關鍵的起始電位會因為奈米金粒子所造成的能帶彎曲改變而有所移動,進而將零偏壓下的效率由0.02%增加到0.59%。最令人驚訝的是金本身在電化學上並不是有利於產生氫氣的催化反應的,因此此處的機制和一般電化學中的催化行為不同。另一方面,為了光電化學分解水產氫研究的長久發展,可比擬為海水,接近酸鹼中性的氯化鈉水溶液做為電解液的效果也被驗證了。在表面形成的薄層氧化層可以做為表面遮蔽層,也因此光電流會隨著時間增加,最後達飽和。最重要的是,由於表面氧化層的保護,光電流能穩定超過12個小時,反應的穩定性大幅提升,而該氧化層在接近中性的氯化鈉中並不會被移除掉。在介面改善的實際應用方面,單層石墨烯被發現具有做為硫/硒擴散阻擋層的獨特特性,未來將能夠應用到銅鋅錫硫(硒)化合物太陽能電池上。石墨烯和二維材料新穎又迷人的獨特特性將有機會能為太陽能光電化學分解水或太陽能電池帶來一些突破性的發展。 Surface and interface modification have huge influences on material characteristics. In this thesis, two different surface modification methods were demonstrated to enhance the performance of GaN photo-electrochemical water splitting. The critical on-set potential of p-GaN can be shifted by gold nanoparticle deposition, which leads to an enhanced zero-bias efficiency from 0.02% to 0.59%. As gold is electrochemically unfavorable to hydrogen generation, the enhancement mechanism is completely different from the general catalyzing behavior in electrochemistry. In addition, for long term development of PEC water splitting, utilization of a near-neutral NaCl solution was examined, which is analogous to sea water. The thin oxide layer formed at the surface acts as a surface passivation layer, causing the photocurrent to increase with time and finally saturate. The most significant consequence is an enhanced durability of over 12 hours resulting from protection by the oxide, which is not removed in the near-neutral NaCl solution. For application in interface modification, the unique property of graphene in acting as a sulfur/selenium diffusion barrier was discovered, and can be applied to Cu2ZnSnS(e)(2) solar cells in the future. The novel and fantastic features of graphene and 2D materials would likely lead to some breakthrough in either solar water splitting or solar photovoltaic technologies. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/58586 |
全文授權: | 有償授權 |
顯示於系所單位: | 光電工程學研究所 |
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ntu-103-1.pdf 目前未授權公開取用 | 6.75 MB | Adobe PDF |
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