LiF层对MEH-PPV:C_(60)掺杂系统光伏特性的影响  

Effect of LiF layer on photovoltaic properties of MEH-PPV:C_(60) composite devices

作　　者：靳辉[1] 侯延冰[1] 孟宪国[1] 滕枫[1] 

机构地区：[1]北京交通大学光电子技术研究所教育部发光与显示重点开放实验室,北京100044

出　　处：《功能材料与器件学报》2007年第3期271-275,共5页Journal of Functional Materials and Devices

基　　金：教育部跨世纪人才基金;教育部重点项目(No.105041);国家自然科学基金(NSFC)(No.90401006;10434030;90301004);"973"计划(No.2003CB314707);华南理工大学特种功能材料及其制备新技术教育部重点实验室资助

摘　　要：将氟化锂(LiF)层引入MEH-PPV:C60掺杂系统的有源层与Al电极层之间,会使MEH-PPV:C60器件的光伏特性发生改变。实验发现,对于未掺杂的MEH-PPV器件,LiF层可以同时提高开路电压和短路电流;对于MEH-PPV:C60掺杂器件,LiF层可以提高器件的开路电压,却减小了短路电流。因为,LiF在电荷产生层与Al电极层之间形成了一个偶极层,它相当于降低了阴极的功函数,因此可以提高器件的内建电势和开路电压。LiF对于掺杂和未掺杂器件的不同影响是C60和MEH-PPV不同的LUMO能级造成的。The effect of a LiF interlayer on the photovohaic characteristics of the ITO/PEDOT：PSS/MEH - PPV：C60 （0wt% , 10wt% and 20wt% ）/Al composite device has been investigated. For undoped MEH - PPV devices （0wt%）, the modified devices show an increase in both the Voc and Isc. However, for composite devices （ 10wt% and 20wt% ）, the modified devices show an increase in the Voc, but a decline in the Isc. These changes of photovoltaic properties are attributed to the dipole layer between composite film and Al cathode due to the introduction of LiF layer. This dipole layer equivalently lowers the work function of cathode, which enhances the build - in potential and thus Voc. The different effects of LiF on the undoped and composite devices are caused by the different LUMO of C60 and MEH - PPV.

关 键 词：聚合物 光伏 开路电压 短路电流 

分 类 号：TN364[电子电信—物理电子学]