Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
J Am Chem Soc. 2010 Feb 3;132(4):1377-82. doi: 10.1021/ja908602j.
Polymer solar cells (PSCs) are commonly composed of a blend film of a conjugated polymer donor and a soluble C(60) derivative acceptor sandwiched between an ITO anode and a low-workfunction metal cathode. Poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM) are the most widely used donor and acceptor materials, respectively. However, the low LUMO energy level of PCBM limits the open circuit voltage (V(oc)) of the P3HT-based PSCs to ca. 0.6 V. Here we synthesized a new soluble C(60) derivative, indene-C(60) bisadduct (ICBA), with a LUMO energy level 0.17 eV higher than that of PCBM. The PSC based on P3HT with ICBA as acceptor shows a higher V(oc) of 0.84 V and higher power conversion efficiency (PCE) of 5.44% under the illumination of AM1.5, 100 mW/cm(2), while the PSC based on P3HT/PCBM displays a V(oc) of 0.58 V and PCE of 3.88% under the same experimental conditions. The results indicate that ICBA is an alternative high-performance acceptor and could be widely used in high-performance PSCs.
聚合物太阳能电池（PSCs）通常由一个共轭聚合物给体和一个可溶性 C(60)衍生物受体的共混膜组成，夹在 ITO 阳极和低功函数金属阴极之间。聚（3-己基噻吩）（P3HT）和[6,6]-苯基-C-61-丁酸甲酯（PCBM）分别是最广泛使用的给体和受体材料。然而，PCBM 的低 LUMO 能级限制了基于 P3HT 的 PSCs 的开路电压（V(oc)）约为 0.6 V。在这里，我们合成了一种新的可溶性 C(60)衍生物，茚并 C(60)双加成物（ICBA），其 LUMO 能级比 PCBM 高 0.17 eV。以 ICBA 为受体的基于 P3HT 的 PSC 在 AM1.5、100 mW/cm(2)光照下表现出更高的开路电压（V(oc)）0.84 V 和更高的功率转换效率（PCE）5.44%，而基于 P3HT/PCBM 的 PSC 在相同实验条件下表现出的开路电压（V(oc)）为 0.58 V 和 PCE 为 3.88%。结果表明，ICBA 是一种替代高性能受体，可广泛应用于高性能 PSCs。
