使用分子偶极子的硫化镉量子点敏化太阳能电池中的能级排列
Energy level alignment in CdS quantum dot sensitized solar cells using molecular dipoles.
作者信息
Shalom Menny, Rühle Sven, Hod Idan, Yahav Shay, Zaban Arie
机构信息
Institute of Nanotechnology & Advanced Materials, Deptartment of Chemistry, Bar Ilan University, 52900 Ramat Gan, Israel.
出版信息
J Am Chem Soc. 2009 Jul 29;131(29):9876-7. doi: 10.1021/ja902770k.
The energy levels of CdS quantum dots (QDs) can be shifted in a systematic fashion with respect to the TiO(2) bands using molecular dipoles. Dipole moments pointing toward the QD surface shift the energy levels toward the vacuum level (a), thus enabling electron injection from excited QD states into the TiO(2) conduction band at lower photon energies compared to QDs with adsorbed molecular dipoles which are pointing away from the QD surface (b). In CdS QD sensitized solar cells this leads to a dipole dependent shift of the photovoltage onset and the photocurrent.
利用分子偶极子，硫化镉量子点（QD）的能级可以相对于二氧化钛（TiO₂）能带以系统的方式发生移动。指向量子点表面的偶极矩会使能级向真空能级移动（a），因此与吸附的分子偶极子背离量子点表面的量子点相比（b），在较低光子能量下就能使激发态量子点的电子注入到二氧化钛导带中。在硫化镉量子点敏化太阳能电池中，这会导致光电压起始点和光电流出现偶极子依赖性的移动。
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