摘要
用光电流作用谱、光电流-电势图、紫外-可见吸收光谱等光电化学方法研究了导电玻璃(ITO)/TiO2/聚 3-甲基噻吩(PMT)电极的光电转换性质. 结果表明, PMT膜为p型半导体, 其禁带宽度为1.93 eV. 并通过循环伏安和光电化学方法确定了其导带位置为-3.44 eV, 价带为-5.37 eV, 在纳米 TiO2与 PMT 之间存在 p-n 异质结, ITO/TiO2/PMT 电极不仅提高了光电流, 而且使产生光电流的起始波长红移至>600 nm, 从而提高了宽禁带半导体的光电转换效率.
The photon-current conversion properties of nanostructured TiO2/poly(3-methythiophene) (PMT) film electrode were studied by using the photocurrent action spectra, the photocurrent dependence of potential and UV-Vis absorption spectra. The bandgap of PMT film is 1.93 eV. The diagram of energy level of PMT film was determined with cyclic voltamogramm and photoelectrochemical method. The conduction band of PMT film is -3.44 eV. The p-n heterojunction existed in the TiO2/PMT film electrode, which favors the separation of electron-hole pairs. The nanostructure can enlarge the visible optical absorption region and obviously increase the photocurrent in visible region. The photocurrent threshold shifted to >600 and the photon-electron conversion efficiency could be improved.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2005年第3期215-218,共4页
Acta Chimica Sinica
基金
国家自然科学基金(No. 20203008)
河北省自然科学基金(No. 202351)
河北省教育厅博士基金(No. 110611)资助项目
