Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA.
Nano Lett. 2012 Mar 14;12(3):1566-70. doi: 10.1021/nl204421p. Epub 2012 Mar 5.
We compare the solar cell performance of several polymers with the conventional electron acceptor phenyl-C61-butyric acid methyl ester (PCBM) to fullerenes with one to three indene adducts. We find that the multiadduct fullerenes with lower electron affinity improve the efficiency of the solar cells only when they do not intercalate between the polymer side chains. When they intercalate between the side chains, the multiadduct fullerenes substantially reduce solar cell photocurrent. We use X-ray diffraction to determine how the fullerenes are arranged within crystals of poly-(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT) and suggest that poor electron transport in the molecularly mixed domains may account for the reduced solar cell performance of blends with fullerene intercalation.
我们将几种聚合物的太阳能电池性能与传统电子受体苯基-C61-丁酸甲酯（PCBM）与具有一至三个茚加成物的富勒烯进行了比较。我们发现，具有较低电子亲和力的多加成富勒烯只有在不插层于聚合物侧链之间时，才能提高太阳能电池的效率。当它们插层于侧链之间时，多加成富勒烯会大大降低太阳能电池的光电流。我们使用 X 射线衍射来确定富勒烯在聚（2,5-双（3-十四烷基噻吩-2-基）噻吩[3,2-b]噻吩）（PBTTT）晶体中的排列方式，并提出在分子混合区域中电子输运不良可能是由于富勒烯插层导致混合物太阳能电池性能降低的原因。
