Center for Polymers and Organic Solids, University of California at Santa Barbara, Santa Barbara, California 93106-5090, United States.
Nano Lett. 2013 Aug 14;13(8):3796-801. doi: 10.1021/nl401758g. Epub 2013 Jul 3.
We demonstrate that the power conversion efficiency can be significantly improved in solution-processed small-molecule solar cells by tuning the thickness of the active layer and inserting an optical spacer (ZnO) between the active layer and the Al electrode. The enhancement in light absorption in the cell was measured with UV-vis absorption spectroscopy and by measurements of the photoinduced carriers generation rate. The ZnO layer used to improve the light-harvesting increases the charge collection efficiency, serves as a blocking layer for holes, and reduces the recombination rate. The combined optical and electrical improvements raise the power conversion efficiency of solution-processed small-molecule solar cells to 8.9%, that is, comparable to that of polymer counterparts.
我们证明，通过调节活性层的厚度并在活性层和 Al 电极之间插入光学间隔物（ZnO），可以显著提高溶液处理小分子太阳能电池的能量转换效率。通过紫外-可见吸收光谱和光生载流子生成速率的测量来测量电池中光吸收的增强。用于提高光捕获的 ZnO 层可以提高电荷收集效率，用作空穴阻挡层，并降低复合速率。光学和电学的综合改进将溶液处理小分子太阳能电池的能量转换效率提高到 8.9%，与聚合物对应物相当。
