Photoconductivity and trap-related decay in porous TiO2/ZnO nanocomposites
Photoconductivity and trap-related decay in porous TiO2/ZnO nanocomposites
复制标题
多孔 TiO2/ZnO 纳米复合材料的光电导性和陷阱相关衰减
DOI：
10.1063/1.3662954
复制
发表时间：
2011-12
影响因子：
3.2
通讯作者：
Xie, Changsheng
中科院分区：
文献类型：
--
作者：
Wu, Jun;Li, Huayao;Liu, Yuan;Xie, Changsheng
研究了多孔二氧化钛/氧化锌纳米复合材料的光电导和陷阱相关的衰减。二氧化钛和氧化锌的光电导响应完全不同，分别归因于电子清除效应和空穴捕获效应。当二氧化钛与氧化锌的摩尔比为9：1~6：4时，光电导响应与二氧化钛基本一致。相反，当二氧化钛与氧化锌的摩尔比为4：6~1：9时，光电导响应受氧化锌的控制。用指数函数对实验数据进行拟合，得到了时间常数。我们发现，随着氧化锌含量的增加，它们有变大的趋势，而在二氧化钛：氧化锌 = 为1：9时出现了一个转折点。这种模式被认为是不同的载流子捕获机制以及载流子分离。用定量公式定义了复合效应，用来评价复合材料的复合过程。提出了一种解释这一现象的机制。
Photoconductivity and trap-related decay were investigated in porous TiO2/ZnO nanocomposites. Photoconductivity responses of TiO2 and ZnO were completely different, which were attributed to electron-scavenging effect and hole trapping effect, respectively. When the mole ratio of TiO2:ZnO was from 9:1 to 6:4, the photoconductivity responses were consistent with TiO2. On the contrary, when the mole ratio of TiO2:ZnO was from 4:6 to 1:9, the photoconductivity responses were controlled by ZnO. Time constants were obtained by fitting the experiment data with an exponential function. We found that they tended to get larger with the percentage of ZnO while a turning point appeared at TiO2:ZnO = 1:9. The pattern was assigned to different carrier trapping mechanisms as well as carrier separation. Composition effect was defined by a quantitative formula to evaluate the recombination processes of composite materials. A mechanism was proposed to explain this phenomenon.
登录
查看更多内容
影响因子：
2.1
作者：
K. Pomoni;A. Vomvas;C. Trapalis
通讯作者：
K. Pomoni;A. Vomvas;C. Trapalis
影响因子：
2.1
作者：
E. Cuculescu;I. Evtodiev;M. Caraman
通讯作者：
E. Cuculescu;I. Evtodiev;M. Caraman
影响因子：
4
作者：
Djurisic, AB;Leung, YH;Gwo, S
通讯作者：
Gwo, S
影响因子：
3.7
作者：
Priti Tiwana;P. Parkinson;M. Johnston;H. Snaith;L. Herz
通讯作者：
Priti Tiwana;P. Parkinson;M. Johnston;H. Snaith;L. Herz
DOI：
10.1080/13642818208246421
发表时间：
1982-07
期刊：
Philosophical Magazine Part B
影响因子：
--
作者：
J. Orenstein;M. Kastner;V. Vaninov
通讯作者：
J. Orenstein;M. Kastner;V. Vaninov