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zuozhijun5134
至尊木蟲 (文壇精英)
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2樓2013-01-24 09:32:03
wxiaoqiang
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【答案】應(yīng)助回帖
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chlfu: 金幣+60, 基金HEPI+1, ★★★很有幫助 2013-07-28 09:24:46
chlfu: 金幣+60, 基金HEPI+1, ★★★很有幫助 2013-07-28 09:24:46
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中文摘要： 在本項目的資助下，我們通過研究BNT、PZT和BFO等鐵電薄膜的光電流，著重研究剩余極化、空間電荷、界面結(jié)構(gòu)和肖特基勢壘對鐵電薄膜光電流的影響。通過不同厚度PZT薄膜光電流的研究，將剩余極化和界面肖特基接觸對光電流的貢獻區(qū)分開來，指出了肖特基接觸在鐵電薄膜光電流中的重要地位；通過對比研究BNT和PZT鐵電薄膜的光電流，指出了薄膜表面形貌對肖特基勢壘的重要影響；通過控制PZT薄膜上界面層的厚度，澄清了肖特基接觸產(chǎn)生的光電流不僅僅取決于肖特基勢壘的大小，還反比于該勢壘所在的界面層厚度；通過不同退火溫度、氣氛控制鐵電薄膜內(nèi)空間電荷密度，發(fā)現(xiàn)高溫或氧氣氛下退火的樣品具有較大的剩余極化和下界面肖特基勢壘，從而產(chǎn)生較大的光電流，空間電荷對光電流的影響機制還需要進一步研究；通過BNT薄膜光電流的研究，闡明了鐵電薄膜剩余極化機制主要是來自于極化的排列取向而在薄膜內(nèi)部形成的退極化場，而不是由于極化束縛電荷出現(xiàn)在上、下界面而打破上、下界面肖特基勢壘的平衡。在上述研究工作的基礎(chǔ)上，提出了鐵電薄膜光電流機制和模型，致力于提高鐵電薄膜的光電流，為進一步研究鐵電薄膜個光伏效應(yīng)及其應(yīng)用打下良好的基礎(chǔ)。 中文主題詞： 鐵電薄膜，光電流，剩余極化，肖特基勢壘，界面結(jié)構(gòu) 英文摘要: Under the aiding of the project, we researched the effect of remnant polarization, space charge, interface structure, and Schottky barrier on the photocurrent of ferroelectric materials, such as BNT, PZT, and BFO films. We suggested that the Schottky effect on the photocurrent was dominated in PZT ferroelectric films when the polarization contribution for the photocurrent and the Schottky one were separated. Comparing the photocurrent of BNT and PZT films, we found the film's surface pattern had the important effect on the Schottky barrier. Controlling the top interface thickness by the method of annealing, we found that the photocurrent due to the Schottky barrier is determined not only by the height of barrier but also by the interface layer thickness. We fabricated the ferroelectric films annealed under different temperature and atmosphere in order to control the amount of space charge. As a result, we found that the samples having larger polarization and bottom interface Schottky barrier were the ones which were annealed in higher temperature and O2 atmospheres. The mechanism of the space charge effect on the photocurrent is still ambiguous and need to be researched further. On the base of the photocurrent of BNT films, we cleared that the polarization effect on the photocurrent is not due to the destruction of the symmetry between the top Schottky barrier and the bottom one attribute to the present of polarization bound charge at the top or bottom interface, but the depolarization field in the film attribute to the alignment of the dipoles. Basing the above works, we brought forward the model and mechanism of the ferroelectric film photocurrent and did our endeavor to enhance the photocurrent of the ferroelectric in order that the researcher and application of the ferroelectric photovoltaic had a well beginning. 英文主題詞： Ferroelectric; photocurrent; remanant; Schottky barrier; Interface structure. |
3樓2013-04-23 21:54:19
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