Fluorine Substituted Conjugated Polymer of Medium Band Gap Yields 7% Efficiency in Polymer-Fullerene Solar Cells
Fluorine Substituted Conjugated Polymer of Medium Band Gap Yields 7% Efficiency in Polymer-Fullerene Solar Cells
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DOI：
10.1021/ja1112595
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发表时间：
2011-03-30
影响因子：
15
通讯作者：
You, Wei
中科院分区：
文献类型：
--
作者：
Price, Samuel C.;Stuart, Andrew C.;You, Wei
用于光伏器件的共轭聚合物的最新研究进展集中在创建低带隙材料，但合适的带隙只是成功的共轭聚合物所需的众多性能标准之一。这项工作的重点是设计用于光伏电池的两种中等带隙（类似于 2.0 eV）共聚物，其设计具有高空穴迁移率和较低的最高占据分子轨道和最低未占据分子轨道能级。当在典型的本体异质结中与[6,6]-苯基C-61-丁酸甲酯共混时，所得氟化聚合物PBnDT-FTAZ表现出高于7%的效率，并且在活性层厚度为1μm时仍保持高于6%的效率。 PBnDT-FTAZ 的性能优于当前选择的中等带隙聚合物聚（3-己基噻吩），因此是用于高效串联电池的可行候选者。除了低带隙之外，PBnDT-FTAZ 还强调了有助于高光伏效率的其他性能标准。
Recent research advances on conjugated polymers for photovoltaic devices have focused on creating low band gap materials, but a suitable band gap is only one of many performance criteria required for a successful conjugated polymer. This work focuses on the design of two medium band gap (similar to 2.0 eV) copolymers for use in photovoltaic cells which are designed to possess a high hole mobility and low highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels. The resulting fluorinated polymer PBnDT-FTAZ exhibits efficiencies above 7% when blended with [6,6]-phenyl C-61-butyric acid methyl ester in a typical bulk heterojunction, and efficiencies above 6% are still maintained at an active layer thicknesses of 1 mu m. PBnDT-FTAZ outperforms poly(3-hexylthiophene), the current medium band gap polymer of choice, and thus is a viable candidate for use in highly efficient tandem cells. PBnDT-FTAZ also highlights other performance criteria which contribute to high photovoltaic efficiency, besides a low band gap.