Low Boiling Point Solvent Additives for Improved Photooxidative Stability in Organic Photovoltaics,Advanced Electronic Materials

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Low Boiling Point Solvent Additives for Improved Photooxidative Stability in Organic Photovoltaics
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2017-12-29 , DOI: 10.1002/aelm.201700416
Sarah Holliday ₁ , Christine K. Luscombe ₁

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The efficiency of organic photovoltaic (OPV) cells is rapidly increasing. However, many of the highest performance OPV devices are also the most unstable, including the two widely used benzodithiophene‐co‐thieno[3,4‐b]thiophene polymers, PTB7 and PTB7‐Th. Here it is shown that both the choice of pendant side chain, and solvents used for film deposition, have an important effect on active layer stability. Specifically, polymers with alkylthienyl side chains are found to be less stable than polymers with alkoxy side chains. Secondly, high boiling point solvent additives such as 1,8‐diiodooctane are found to dramatically accelerate photooxidation unless they are removed fully during device processing, which may be attributed to increased oxygen diffusion in films containing residual solvent. Replacing these higher boiling point solvent additives with lower boiling additives can greatly enhance the polymer stability without requiring high vacuum treatment, making these systems more scalable and compatible with roll‐to‐roll printing. Based on this finding, the non‐halogenated solvent system o‐xylene with 2% N‐methylpyrrolidone is explored as a route to achieving higher active layer stability, while maintaining the favorable, intermixed morphology achieved with higher boiling point, halogenated solvent additives. This result offers a promising way forward in the development of scalable, stable, and high‐efficiency organic solar cells.

中文翻译：

低沸点溶剂添加剂可改善有机光伏的光氧化稳定性

有机光伏（OPV）电池的效率正在迅速提高。但是，许多性能最高的OPV设备也是最不稳定的，包括两种广泛使用的苯并二噻吩-共噻吩并[3,4-b]噻吩聚合物PTB7和PTB7-Th。在此表明，侧链侧链的选择以及用于膜沉积的溶剂均对活性层稳定性有重要影响。具体地，发现具有烷基噻吩基侧链的聚合物比具有烷氧基侧链的聚合物更不稳定。其次，除非在器件加工过程中将它们完全除去，否则发现高沸点溶剂添加剂（例如1,8-二碘辛烷）会极大地促进光氧化，这可能是由于含残留溶剂的薄膜中的氧扩散增加所致。用较低沸点的添加剂代替这些较高沸点的溶剂添加剂可以大大提高聚合物的稳定性，而无需进行高真空处理，从而使这些系统更具可扩展性，并与卷对卷印刷兼容。基于此发现，探索了非卤代溶剂体系邻二甲苯和2％N-甲基吡咯烷酮的方法，以实现更高的活性层稳定性，同时保持通过更高沸点的卤代溶剂添加剂获得的良好的混合形态。这一结果为可扩展，稳定和高效的有机太阳能电池的开发提供了一种有前途的方法。探索了一种非卤代溶剂体系邻二甲苯和2％N-甲基吡咯烷酮的方法，以实现更高的活性层稳定性，同时保持较高沸点的卤代溶剂添加剂所产生的良好的混合形态。这一结果为可扩展，稳定和高效的有机太阳能电池的开发提供了一种有前途的方法。探索了非卤代溶剂体系邻二甲苯和2％N-甲基吡咯烷酮的方法，以实现更高的活性层稳定性，同时保持通过更高沸点的卤代溶剂添加剂获得的良好的混合形态。这一结果为可扩展，稳定和高效的有机太阳能电池的开发提供了一种有前途的方法。

更新日期：2017-12-29

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