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Determination of Solvent Systems for Blade Coating Thin Film Photovoltaics

机译：叶片涂层薄膜光伏溶剂体系的确定

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摘要

With lab-scale solution-processed thin film photovoltaic (TFPV) devices attaining market relevant efficiencies, the demand for environmentally friendly and scalable deposition techniques is increasing. Replacing toxic halogenated solvents is a priority for the industrialization of solution-processed TFPV. In this work, a generalized five-step process is presented for fabricating high-performance devices from nonhalogenated inks. Resulting from this process, several new solvent systems are introduced based on thiophene, tetralin, 1,2,4-trimethylbenzene, o-xylene, and anisole for blade coating of three different diketopyrrolopyrrole-based (pDPP5T-2, pPDPP5T-2S, and P390) bulk heterojunctions applied in organic photovoltaic devices. Devices based on pDPP5T-2S and P390 attain 5.6% and 6.1% efficiency, respectively, greater than the efficiency either material reached when processed from the halogenated solvent system commonly used. These processes are implemented without post-deposition annealing treatments or additives. The Hansen solubility parameters of the pDPP5T-2 material are obtained, and are used, along with wettability data on a variety of substrates, to determine optimum solvent combinations and ratios for deposition. This generalized five-step process results in new nonhalogenated solvent pathways for the scalable deposition of thin film photovoltaic materials.
机译：随着实验室规模的溶液处理的薄膜光伏（TFPV）器件达到与市场相关的效率，对环境友好和可扩展的沉积技术的需求正在增长。替代有毒卤代溶剂是溶液处理TFPV工业化的优先考虑。在这项工作中，提出了一种通用的五步过程，该过程用于由非卤代墨水制造高性能器件。由于这一过程，引入了几种新的基于噻吩，四氢萘，1,2,4-三甲苯，邻二甲苯和苯甲醚的溶剂体系，用于对三种不同的基于二酮吡咯并吡咯（pDPP5T-2，pPDPP5T-2S和P390）本体异质结应用于有机光伏器件。基于pDPP5T-2S和P390的设备分别达到5.6％和6.1％的效率，这比从通常使用的卤代溶剂系统加工得到的两种材料的效率都高。无需沉积后退火处理或添加剂即可实施这些工艺。获得了pDPP5T-2材料的Hansen溶解度参数，并将其与各种基材上的润湿性数据一起用于确定最佳的溶剂组合和沉积比例。这种通用的五步过程为薄膜光伏材料的可扩展沉积提供了新的非卤代溶剂途径。

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