Effects of the optical microcavity on the performance of ITO-free polymer solar cells with WO₃/Ag/WO₃ transparent electrode

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• 作者：Wenjuan Yu^a ; Liang Shen^a ; ^{shenliang_jlu@126.com} ; ^{shenliang@jlu.edu.cn} ; Fanxu Meng^a ; Yongbing Long^b ; ^{yongbinglong@gmail.com} ; Shengping Ruan^a ; Weiyou Chen^a
• 关键词：Optical microcavity ; ITO-free ; Polymer solar cells
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：2012
• 期刊代码：81_09270248
• 类别：ce
• 出版时间：May, 2012
• 卷：100
• 期：Complete
• 页码：226-230
• 文件大小：825 K

摘要

We fabricate ITO-free bulk-heterojunction polymer solar cells (PSCs) with the structure glass/WO₃/Ag/WO₃/P3HT:PCBM/LiF/Al. According to the J-V characterization, the device efficiency is improved by 27.4%for the ITO-free device with a 70 nm-thick active layer but reduced by 19.9%for the device with a 150 nm-thick active layer, when compared with that of the PSC device with an ITO transparent electrode. Further investigation based on IPCE spectra test and transfer matrix simulations reveals that it is the optical resonance effect of the metal-mirror-microcavity (MMC) constructed between the semitransparent Ag electrode and top Al electrode that leads to the efficiency improvement for the device with 70 nm-thick active layer. Meanwhile, the efficiency reduction of the device with a 150 nm-thick active layer is caused by the off-resonance suppression of the MMC structure. It demonstrates that the MMC structure is an important element to be considered when the WO₃/Ag/WO₃ multilayer is used to substitute the ITO electrode as a transparent electrode of the PSC devices.