Department of Chemistry, Center for Polymers and Organic Solids, University of California, Santa Barbara, California 93106, USA.
ACS Appl Mater Interfaces. 2012 Jan;4(1):244-50. doi: 10.1021/am201304e. Epub 2012 Jan 13.
Although one of the most attractive aspects of organic solar cells is their low cost and ease of fabrication, the active materials incorporated into the vast majority of reported bulk heterojunction (BHJ) solar cells include a semiconducting polymer and a fullerene derivative, classes of materials which are both typically difficult and expensive to prepare. In this study, we demonstrate that effective BHJs can be fabricated from two easily synthesized dye molecules. Solar cells incorporating a diketopyrrolopyrrole (DPP)-based molecule as a donor and a dicyanoimidazole (Vinazene) acceptor function as an active layer in BHJ solar cells, producing relatively high open circuit voltages and power conversion efficiencies (PCEs) up to 1.1%. Atomic force microscope images of the films show that active layers are rough and apparently have large donor and acceptor domains on the surface, whereas photoluminescence of the blends is incompletely quenched, suggesting that higher PCEs might be obtained if the morphology could be improved to yield smaller domain sizes and a larger interfacial area between donor and acceptor phases.
虽然有机太阳能电池最吸引人的方面之一是其低成本和易于制造，但绝大多数报道的体异质结 (BHJ) 太阳能电池中所采用的活性材料都包括半导体聚合物和富勒烯衍生物，这两类材料通常都难以制备且昂贵。在本研究中，我们证明了可以使用两种易于合成的染料分子来制备有效的 BHJ。以二酮吡咯并吡咯 (DPP) 为供体和二氰基咪唑 (Vinazene) 为受体的太阳能电池，其作为活性层的 BHJ 太阳能电池的开路电压和功率转换效率 (PCE) 相对较高，高达 1.1%。薄膜的原子力显微镜图像显示，活性层是粗糙的，表面上显然有较大的供体和受体区域，而混合物的光致发光没有完全猝灭，这表明如果可以改善形态以获得更小的域尺寸和更大的供体和受体相之间的界面面积，那么可以获得更高的 PCE。
