Enhanced Photoanodic Output at an Organic p/n Bilayer in the Water Phase by Means of the Formation of Whiskered Phthalocyanine
Enhanced Photoanodic Output at an Organic p/n Bilayer in the Water Phase by Means of the Formation of Whiskered Phthalocyanine
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DOI：
10.1021/am302209b
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发表时间：
2013-02-27
影响因子：
9.5
通讯作者：
Nagai, Keiji
中科院分区：
文献类型：
--
作者：
Abe, Toshiyuki;Tanno, Yoshinori;Nagai, Keiji
研究了水相中有机p/n双层膜的光电极特性;将3，4，9，10-二萘嵌苯四羧酸双苯并咪唑（PTCBI，一种n型半导体）与29 H，31 H-酞菁（H2 Pc，一种p型半导体）结合使用。当将H2 Pc气相沉积在加热的基底上的PTCBI层的顶部上时（参见压力的程度，约。5.0 x 10（-4）Pa;衬底温度，120摄氏度），透射电子显微镜图像显示，与室温下制备的接触面积相比，p/n界面的接触面积有所增加，由于晶须H2 Pc的形成。PTCBI/H2 Pc双层膜可以作为光电阳极沿着其内部的光物理事件。在H2 Pc/水界面的限速电荷转移进行了动力学分析，假设在该界面的Langmuir吸附平衡。动力学分析表明，增加的接触面积可以成功地导致有效的光致载流子产生，特别是，当形成厚晶须的H2 Pc，在H2 Pc/水界面的氧化动力学的幅度是约2.5倍，高于没有热处理。
The photoelectrode characteristics of an organic p/n bilayer in the water phase were studied with respect to film; 3,4,9,10-perylenetetracarboxylic-bisbenzimidazole (PTCBI, an n-type semiconductor) was used in combination with 29H,31H-phthalocyanine (H2Pc, a p-type semiconductor). When H2Pc was vapor-deposited on top of the PTCBI layer on a heated substrate (cf. degree of pressure, ca. 5.0 x 10(-4) Pa; temperature at the substrate, 120 degrees C), a transmission electron microscopic image showed an enhanced contact area of the p/n interface in comparison with that prepared at r.t., due to the formation of a whisker H2Pc. The PTCBI/H2Pc bilayer can work as a photoanode along with photophysical events in its interior. The rate-limiting charge transfer at the H2Pc/water interface was kinetically analyzed assuming the Langmuir adsorption equilibrium at that interface. Kinetic analysis demonstrated that the increased contact area can successfully lead to efficient photoinduced carrier generation; particularly, when a thick whisker of H2Pc was formed, the magnitude of the oxidation kinetics at the H2Pc/water interface was approximately 2.5 times higher than that without thermal treatment.