Improved Light Harvesting and Improved Efficiency by Insertion of an Optical Spacer (ZnO) in Solution-Processed Small-Molecule Solar Cells
Improved Light Harvesting and Improved Efficiency by Insertion of an Optical Spacer (ZnO) in Solution-Processed Small-Molecule Solar Cells
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DOI：
10.1021/nl401758g
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发表时间：
2013-08-01
期刊：
影响因子：
10.8
通讯作者：
Heeger, Alan J.
中科院分区：
文献类型：
--
作者：
Kyaw, Aung Ko Ko;Wang, Dong Hwan;Heeger, Alan J.
我们证明，可以显着提高功率转换效率的溶液处理的小分子太阳能电池通过调整的活性层的厚度和插入的活性层和Al电极之间的光学间隔物（ZnO）。用紫外-可见吸收光谱和通过测量光诱导载流子产生速率来测量电池中光吸收的增强。用于改善光捕获的ZnO层增加了电荷收集效率，用作空穴的阻挡层，并降低了复合率。光电结合的改进将溶液处理的小分子太阳能电池的功率转换效率提高到8.9%，与聚合物电池相当。
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.