紫外臭氧处理超薄银修饰ITO电极的高效柔性有机太阳能电池（英文）

High-efficiency Flexible Organic Solar Cells with UV-ozone Treated Silver Modification ITO Electrode

以紫外臭氧处理超薄Ag复合MoO_3或PEDOT∶PSS修饰ITO电极的高效柔性有机太阳能电池。通过优化紫外臭氧处理Ag薄膜的时间,提高了以P3HT∶PCBM为有源层的器件的功率转换效率,从1.68%(未经过紫外臭氧处理)提高到2.57%(紫外臭氧处理Ag 1 min)。提高的原因推测是紫外臭氧处理形成了AgO_x薄膜,提高了电荷提取并使器件具有高光学透明度、低串联电阻和优异的表面功函数等一些性能。并且,紫外臭氧处理Ag薄膜与MoO_3或者PEDOT∶PSS复合修饰ITO的器件效率分别得到提高,Ag薄膜与MoO_3复合修饰ITO的器件效率从2.02%(PET/ITO/MoO_3)提高到2.97%(PET/ITO/AgO x/MoO_3),Ag薄膜与PEDOT∶PSS复合修饰ITO的器件效率从2.01%(PET/ITO/PEDOT∶PSS)提高到2.93%(PET/ITO/AgO x/PEDOT∶PSS)。此外,以PBDTTT-EFT∶PC71BM为有源层的柔性聚合物太阳能电池效率可达6.21%。基于ITO的柔性光电器件效率的提高主要归于ITO被Ag/PEDOT∶PSS或Ag/MoO_3修饰后功函数的提高。

Highly efficient heterojunction polymer solar cells based on ITO flexible electrode were developed with an UVozone-treated ultrathin silver interlayer combined with MoO3/PEDOT∶ PSS as modification materials. By optimizing UVozone-treated time of silver thin films,it could improve the power conversion efficiency（PCE） of the device based on the blend of poly（3-hexylthiophene）（P3HT） ∶ [6,6]-phenyl C61-butyric acidmethyl ester（PC61BM） from 1. 68%（without UV-ozone treatment） to 2. 57%（Ag with 1 min UV-ozone treatment）,which might be an Ag Oxlayer formation that improves hole extraction and several promising characteristics,including high optical transparency,low sheet resistance and superior surface work function. Meanwhile,the devices with UV-ozone treated thin Ag layer together with MoO3 or PEDOT∶PSS improves PCEs from 2. 02% for the device with PET/ITO/MoO3 to 2. 97% for the device with PET/ITO/Ag Ox/MoO3 and from 2. 01% to 2. 93% for device with PEDOT∶ PSS. In addition,the PCE of 6. 21% of the flexible polymer solar cells based on poly[4,8-bis（5-（2-ethylhexyl） thiophen-2-yl）-benzo[1,2-b; 4,5-b＇] dithiophene-2,6-diylalt-（4-（2-ethylhe-xyl）-3-fluorothieno[3,4-b]thiophene-）-2-carboxylate-2-6-diyl（PBDTTT-EFT） ∶ [6,6]-phenyl C71-butyric acid methyl ester（PC71BM） as an photoactive layer was obtained. The efficiency improvement of the flexible OPV based on ITO is due to the increase of the work function of ITO by ITO/Ag/PEDOT∶ PSS or MoO3 composition.