Realization of Foldable Polymer Solar Cells Using Ultrathin Cellophane Substrates and ZnO/Ag/ZnO Transparent Electrodes
Realization of Foldable Polymer Solar Cells Using Ultrathin Cellophane Substrates and ZnO/Ag/ZnO Transparent Electrodes
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使用超薄玻璃纸基板和ZnO/Ag/ZnO透明电极实现可折叠聚合物太阳能电池
DOI：
10.1002/solr.201800123
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发表时间：
2018
期刊：
影响因子：
7.9
通讯作者：
Song Weijie
中科院分区：
文献类型：
--
作者：
Li Hongjiang;Liu Xiaohui;Wang Weiyan;Lu Yuehui;Huang Jinhua;Li Jia;Xu Junjun;Fan Pengxuan;Fang Junfeng;Song Weijie
可折叠太阳能电池在便携式和可穿戴应用方面受到越来越多的关注。实现可折叠性的挑战是在大应变下不形成裂纹。我们的力学模拟表明，将衬底厚度从150 μm减小到25 μm是一种减轻聚合物太阳能电池在折叠时应变的方法，其曲率半径极小，为亚毫米。采用ZnO/超薄Ag/ZnO （OMO）透明电极代替传统的ITO，在超薄25 μm玻璃纸衬底上制备了聚合物太阳能电池，构成了典型的玻璃纸/OMO/ZnO/PTB7‐Th:PC71BM/MoO3/Al器件结构。该太阳能电池的功率转换效率为5.94%，功率重量比为2.11 W g−1。太阳能电池在折叠35次后，转换效率仍然保持在初始值的92%，这主要归因于超薄衬底和OMO电极的协同作用，从玻璃纸/ZnO/超薄Ag/ZnO在折叠50次后的稳定电阻可以推断出来。这项工作不仅为太阳能电池，也为其他光电器件实现卓越的可折叠性铺平了道路。
Foldable solar cells have attracted increasing attention for portable and wearable applications. The challenge to achieve foldability is free from the formation of cracks under large strain. Our mechanical simulations suggests that a reduction in substrate thickness from 150 to 25 μm is a means to mitigate the strain in polymer solar cells under folding with extremely small curvature radius of sub‐millimeter. The polymer solar cells are experimentally prepared on ultrathin 25 μm cellophane substrates with ZnO/ultrathin Ag/ZnO (OMO) transparent electrodes, instead of conventional ITO, composing a typical device structure, cellophane/OMO/ZnO/PTB7‐Th:PC71BM/MoO3/Al. The solar cells exhibit a power conversion efficiency of 5.94% and a power weight ratio of 2.11 W g−1. After folding the solar cells for 35 cycles, the conversion efficiency still maintained 92% of the initial value, which is mainly ascribed to the synergistic effects of ultrathin substrates and the OMO electrodes, as inferred from the stable resistance of the cellophane/ZnO/ultrathin Ag/ZnO even after 50 folding cycles. This work paves the way toward realizing superior foldability not only in solar cells, but also in other optoelectronic devices.