有机太阳能电池体系中新型富勒烯类受体材料的研究

项目名称： 有机太阳能电池体系中新型富勒烯类受体材料的研究

项目编号： No.21273006

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 蒋礼

作者单位： 中国科学院化学研究所

项目金额： 78万元

中文摘要： 富勒烯具有优良的得电子特性，是构筑本体异质结有机光伏器件最优秀的电子受体材料。目前，本体异质结光伏器件的最高光电转换效率已经达到了10.1%，但如何进一步提高PCE依然是国际竞争的热点。研究发现，提高光伏器件的开路电压是进一步提高其能量转换效率的关键因素之一，而器件开路电压的提高主要依赖于受体材料中LUMO能级的提高。富勒烯是一个由空心富勒烯、金属富勒烯以及各种富勒烯衍生物共同组成的庞大家族。已有研究发现金属富勒烯Lu3N@C80衍生物受体材料比C60同样衍生物的LUMO能级高260 mV之多，大碳笼富勒烯的LUMO能级也要明显高于小碳笼富勒烯，从而展现出大幅提高器件开路电压以及光电转换效率的潜力。在前期青年基金项目的研究工作中，我们通过设计合成新的富勒烯衍生物获得了高性能光伏器件，本项目拟在此基础上研究金属富勒烯衍生物及大碳笼富勒烯衍生物受体材料，提高器件开路电压，获得高光电转换效率。

中文关键词： 富勒烯衍生物；受体材料；界面修饰材料；有机太阳能电池；光伏器件

英文摘要： Fullerene is known as the best acceptor material in bulk hetero-junction organic photovoltaic (BHJOPV) devices for its outstanding capturing electrons. At present, 10.1% of power conversion efficiency (PCE) has been achieved in BHJOPV. But studying further to obtain higher PCE still remains a challenge. It is found that the high PCE always results from higher open-circuit voltage (Voc), which depends on the lowest unoccupied molecular orbital (LUMO) level of acceptor to a great extent. Fullerene material is a diverse family composed of empty fullerenes, endohedral fullerenes and various fullerene derivatives. It is reported that the LUMO level of Lu3N@C80 derivative is 260 mV higher than that of C60. Meanwhile, the LUMO levels of large cage fullerenes are also higer obviously than those of smaller cage fullerenes. Therefore, it is very meaningful to explore more novel fullerene acceptor materials besides C60 and C70. In the previous study, several novel fullerene derivatives have been designed and synthesized followed by the achievement of OPV devices with excellent properties. In this project, more fullerene derivatives based on metallofullerenes and larger cage fullerenes will be studied to improve Voc further and PCE.

英文关键词： Fullerene derivatives；Acceptor；Interfacial layer materials；Organic solar cells；Photovoltaic devices