Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.
Nano Lett. 2011 Sep 14;11(9):3998-4002. doi: 10.1021/nl202435t. Epub 2011 Aug 26.
Quantum dots show great promise for fabrication of hybrid bulk heterojunction solar cells with enhanced power conversion efficiency, yet controlling the morphology and interface structure on the nanometer length scale is challenging. Here, we demonstrate quantum dot-based hybrid solar cells with improved electronic interaction between donor and acceptor components, resulting in significant improvement in short-circuit current and open-circuit voltage. CdS quantum dots were bound onto crystalline P3HT nanowires through solvent-assisted grafting and ligand exchange, leading to controlled organic-inorganic phase separation and an improved maximum power conversion efficiency of 4.1% under AM 1.5 solar illumination. Our approach can be applied to a wide range of quantum dots and polymer hybrids and is compatible with solution processing, thereby offering a general scheme for improving the efficiency of nanocrystal hybrid solar cells.
量子点在制备具有增强的功率转换效率的混合体异质结太阳能电池方面显示出巨大的潜力，然而控制纳米级长度尺度上的形态和界面结构具有挑战性。在这里，我们展示了基于量子点的混合太阳能电池，其施主和受主组件之间的电子相互作用得到了改善，从而导致短路电流和开路电压显著提高。通过溶剂辅助接枝和配体交换，将 CdS 量子点结合到结晶 P3HT 纳米线上，导致有机-无机相分离得到控制，在 AM 1.5 太阳光照射下最大功率转换效率提高到 4.1%。我们的方法可以应用于广泛的量子点和聚合物混合物，并且与溶液处理兼容，从而为提高纳米晶体混合太阳能电池的效率提供了一种通用方案。
