对有机/无机光电探测器PTCDA/p-Si样品的表面进行得AFM扫描看出,PTCDA呈岛状生长,各岛成圆丘状,岛的分布不均匀,PTCDA层中存在大量缺陷。原因是p-Si(100)衬底的表面原子悬挂键的作用,使硅原子横向移动满足键合需要形成台阶和其它缺陷引...对有机/无机光电探测器PTCDA/p-Si样品的表面进行得AFM扫描看出,PTCDA呈岛状生长,各岛成圆丘状,岛的分布不均匀,PTCDA层中存在大量缺陷。原因是p-Si(100)衬底的表面原子悬挂键的作用,使硅原子横向移动满足键合需要形成台阶和其它缺陷引起的。将样品表面的XPS全谱及精细谱与表面的AFM扫描图进行对比分析,得出PTCDA在p-Si基底上的生长模式,即:PTCDA首先在缺陷处聚集,形成许多三维岛状的PTCDA晶核,然后在PTC-DA离域大π键的作用下,相邻的两层PTCDA分子存在一定程度的交叠,最终形成岛状结构。与硅衬底原子结合的过程为:苝环与缺陷处的Si原子结合,而酸酐基团与表面完整处的Si结合。结合时,苝环结构保持不变,而酸酐基团与Si发生化学反应,使酸酐中的C O键断开,形成O Si C和硅氧化物。对PTCDA/p-Si样品的界面的XPS全扫描谱和精细图谱进行分析后,进一步验证了PTCDA在p-Si基底上的生长模式。展开更多
对PTCDA的分子结构及其化学键的形成进行了分析,并讨论了晶面指数(100)Si单晶的晶格结构。在此基础上,评述了PTCDA分子在P-Si单晶(100)晶面上生长的机理,并制备了样品PTCDA/P-Si(100)。利用XRD对样品测试得出,在P-Si(100)晶面上沉积的PT...对PTCDA的分子结构及其化学键的形成进行了分析,并讨论了晶面指数(100)Si单晶的晶格结构。在此基础上,评述了PTCDA分子在P-Si单晶(100)晶面上生长的机理,并制备了样品PTCDA/P-Si(100)。利用XRD对样品测试得出,在P-Si(100)晶面上沉积的PTCDA薄膜中仅存在α物相。利用XPS对样品测试得出,在其界面层中PTCDA酸酐中的4个羟基O原子与C原子结合,其结合能为532.4 e V;苝核基团外围的8个C、H原子以共价键结合,其结合能为289.0 e V;在界面处,悬挂键上的Si原子与PTCDA酸酐中的C、O原子结合,形成C—Si—O键及C—Si键,构成了界面层的稳定结构。展开更多
Through the investigation of the sample surface and interface of 3, 4, 9, 10-perylenetetracarboxylic dianhydride (PTCDA)/indium-tin-oxide (ITO) thin films using atomic force microscopy, it has been found that the ...Through the investigation of the sample surface and interface of 3, 4, 9, 10-perylenetetracarboxylic dianhydride (PTCDA)/indium-tin-oxide (ITO) thin films using atomic force microscopy, it has been found that the surface is complanate, the growth is uniform and the defects cover basically the surface of ITO. Furthermore, the number of pinholes is small. The analysis of the sample surface and interface further verifies this result by using x-ray photoemission spectroscopy. At the same time, PTCDA is found to have the ability of restraining the diffusion of chemical constituents from ITO to the hole transport layer, which is beneficial to the improvement of the performance and the useful lifetime of the organic light emitting diodes (OLEDs).展开更多
文摘对有机/无机光电探测器PTCDA/p-Si样品的表面进行得AFM扫描看出,PTCDA呈岛状生长,各岛成圆丘状,岛的分布不均匀,PTCDA层中存在大量缺陷。原因是p-Si(100)衬底的表面原子悬挂键的作用,使硅原子横向移动满足键合需要形成台阶和其它缺陷引起的。将样品表面的XPS全谱及精细谱与表面的AFM扫描图进行对比分析,得出PTCDA在p-Si基底上的生长模式,即:PTCDA首先在缺陷处聚集,形成许多三维岛状的PTCDA晶核,然后在PTC-DA离域大π键的作用下,相邻的两层PTCDA分子存在一定程度的交叠,最终形成岛状结构。与硅衬底原子结合的过程为:苝环与缺陷处的Si原子结合,而酸酐基团与表面完整处的Si结合。结合时,苝环结构保持不变,而酸酐基团与Si发生化学反应,使酸酐中的C O键断开,形成O Si C和硅氧化物。对PTCDA/p-Si样品的界面的XPS全扫描谱和精细图谱进行分析后,进一步验证了PTCDA在p-Si基底上的生长模式。
文摘对PTCDA的分子结构及其化学键的形成进行了分析,并讨论了晶面指数(100)Si单晶的晶格结构。在此基础上,评述了PTCDA分子在P-Si单晶(100)晶面上生长的机理,并制备了样品PTCDA/P-Si(100)。利用XRD对样品测试得出,在P-Si(100)晶面上沉积的PTCDA薄膜中仅存在α物相。利用XPS对样品测试得出,在其界面层中PTCDA酸酐中的4个羟基O原子与C原子结合,其结合能为532.4 e V;苝核基团外围的8个C、H原子以共价键结合,其结合能为289.0 e V;在界面处,悬挂键上的Si原子与PTCDA酸酐中的C、O原子结合,形成C—Si—O键及C—Si键,构成了界面层的稳定结构。
基金The Doctorate Foundation of Northwestern Polytechnical University(No.CX201324)the National Natural Science Foundation of China(Nos.51471135,51171152)the Seed Foundation of Innovation and Creation for Graduate Students in Northwestern Polytechnical University(No.Z2015144)
基金Project supported by the National Natural Science Foundation of China (Grant No 60276026) and the Natural Science Foundation of Gansu Province, China (Grant No ZS031-A25-012-G).
文摘Through the investigation of the sample surface and interface of 3, 4, 9, 10-perylenetetracarboxylic dianhydride (PTCDA)/indium-tin-oxide (ITO) thin films using atomic force microscopy, it has been found that the surface is complanate, the growth is uniform and the defects cover basically the surface of ITO. Furthermore, the number of pinholes is small. The analysis of the sample surface and interface further verifies this result by using x-ray photoemission spectroscopy. At the same time, PTCDA is found to have the ability of restraining the diffusion of chemical constituents from ITO to the hole transport layer, which is beneficial to the improvement of the performance and the useful lifetime of the organic light emitting diodes (OLEDs).