WO3对Rubrene/C70有机太阳能电池性能的改善

Performance improvement of Rubrene/C_(70) based organic solar cells with WO_3 as buffer layer

研究了WO3对Rubrene/C70有机太阳能电池(OSCs)性能的改善,制备了结构为ITO/WO3/Rubrene/C70/BCP/Al的OSCs,其中WO3插入在ITO和Rubrene中间作为阳极修饰层。通过优化WO3的厚度,研究了WO3对OSCs性能的改善及其作用机理。实验发现,器件的短路电流Jsc、开路电压Voc、填充因子(FF)、光电转换效率(PCE)和串联电阻Rs等性能参数随WO3厚度的变化呈规律性变化;当WO3厚度小于80nm时,器件PCE随着厚度的增加不断增大;当WO3厚大于80nm时,器件PCE随着厚度的增加不断减小;当WO3厚度为80nm时,器件PCE达到最高为1.03%,相应的Jsc、Voc、FF分别为2.81mA·cm-2、0.83V、43.85%,Rs为45.3Ω·cm2,对比没有WO3修饰层,器件的Jsc、Voc、FF和PCE分别提高了31%、137%、17%和268%,Rs降低了33%。

The performance improvement of Rubrene/C70 based organic solar cells （OSCs） with WO3 as buffer layer is studied in this paper. The OSCs with the structure of ITO/WO3/Rubrene/C70/BCP/Al were fabricated. WO3 was used as anode buffer layer,inserted between ITO and Rubrene. The perform- ance and mechanism of the OSCs are studied by inserting WOa with different thicknesses as buffer layer. The experimental results show that the characteristic parameters of the OSCs,including the short-circuit current （Jsc）, open-circuit voltage （Voc）, filling factor （FF）, series resistance （Rs） and power conversion efficiency （PCE） ,have a regular change with different WO3thicknesses as buffer layers. The PCE of the OSCs is increased with the increasing thickness of WO3, when the thickness is smaller than 80 nm. The PCE of the OSCs is decreased with the increasing thickness of WO3 ,when the thickness is larger than 80 nm. The PCE of the device is as high as 1.03 % with 80 m-thick WO3 while the Jsc ,Voc, FF and Rs of the OSCs are 2.81 mA · cm^-2 ,0. 83 V,43.85% and 45.3 Ω· cm^2 ,respectively. Compared with the device without buffer layer,the Jso ,Voc ,FF and PCE of the OSCs are enhanced by 31%, 137% ,17% and 268% ,respectively. Rs is reduced by 33%.