Electronic density tailing outside π-conjugated polymer surface
Electronic density tailing outside π-conjugated polymer surface
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DOI：
10.1063/1.2374844
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发表时间：
2006-11
影响因子：
4
通讯作者：
X. Hao;T. Hosokai;N. Mitsuo;S. Kera;K. Mase;K. Okudaira;N. Ueno
中科院分区：
文献类型：
--
作者：
X. Hao;T. Hosokai;N. Mitsuo;S. Kera;K. Mase;K. Okudaira;N. Ueno
采用Penning电离电子能谱（PIES）研究了共轭聚3-己基噻吩（P3 HT）的表面电子性质，目的是检测聚合物表面的电子密度拖尾。P3 HT膜的侧边构象的最高占据分子轨道（HOMO）态的电子波函数被侧链己基链屏蔽，PIES未检测到;而P3 HT膜的面边构象的HOMO态的电子波函数则在聚合物表面外拖尾，PIES可清楚地观察到。在聚合物表面外HOMO电子波函数的存在使得可以形成与覆盖层材料重叠的HOMO-HOMO，因此在用于器件应用的异质结结构中期望更有效的电荷转移。
Penning ionization electron spectroscopy (PIES) was adopted to examine surface electronic property of conjugated poly(3-hexylthiophene) (P3HT) aiming to detect the electronic density tailing outside a polymer surface. The electronic wave function of the highest occupied molecular orbital (HOMO) state is shielded by side hexyl chain for a P3HT film with edge-on conformation and was not detected by PIES, while it is tailing outside the polymer surface for face-on conformation and was observed clearly by PIES. The presence of HOMO electronic wave function outside the polymer surface makes it possible to form HOMO-HOMO overlapping with overlayer materials, and therefore more efficient charge transfer is expected in a heterojunction structure for device application.