High efficiency and stability small molecule solar cells developed by bulk microstructure fine-tuning
High efficiency and stability small molecule solar cells developed by bulk microstructure fine-tuning
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DOI：
10.1016/j.nanoen.2016.08.047
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发表时间：
2016-10-01
期刊：
影响因子：
17.6
通讯作者：
Brabec, Christoph J.
中科院分区：
文献类型：
--
作者：
Min, Jie;Jiao, Xuechen;Brabec, Christoph J.
采用三种不同的后处理策略，包括热退火（TA）、溶剂蒸汽退火（SVA）和两步退火（TA-SVA）处理，研究了以五苯二烯基分子（DRCN5T）为电子给体、[6,6]-苯基- c71 -丁酸甲酯（PC70BM）为电子受体组成的高效小分子光伏系统的体异质结（BHJ）微观结构的形态学控制。我们系统地分析了加工条件-微观结构-器件性能的关系，探讨了相应的形态演变及其对BI-Js中载流子输运和重组动力学的影响，并了解了相分离过程的本质导致光诱导降解机制。在研究结果中，首次描述了退火顺序、光伏参数、形貌演化和载流子动力学之间的因果关系。此外，在器件效率和稳定性方面观察到的权衡相对于良好定义的形态被强调。体微结构形成及其动力学演变的深入图像作为特定后处理方法的功能，对于设计新的光伏材料和薄膜纳米结构具有宝贵的价值，这些材料和纳米结构更有效，更有助于未来的商业化努力。(C) 2016 Elsevier Ltd.版权所有。
Morphological control over the bulk heterojunction (BHJ) microstructure of a high-efficiency small molecule photovoltaic system composed of a quinquethiophene based molecule (DRCN5T) as electron donor and [6,6]-phenyl-C71-butyric acid methyl ester (PC70BM) as electron acceptor is demonstrated using three different post-processing strategies, including thermal annealing (TA), solvent vapor annealing (SVA), and two-step annealing (TA-SVA) treatments. We systematically analyze the processing condition-microstructure-device property relationships, explore the corresponding morphology evolution and their effects on carrier transport and recombination dynamics in BI-Js as well as understand the nature of phase-separation process resulting in light-induced degradation mechanisms. Within the investigated results, the causative relations between annealing sequence, photovoltaic parameters, morphology evolution and charge carrier dynamics are for the first time delineated. In addition, the observed trade-offs in device efficiency and stability with respect to the well-defined morphologies are highlighted. The in-depth picture of the bulk microstructure formation and its kinetic evolution as a function of the specific post-processing approaches is a valuable asset for the design of new photovoltaic materials and thin film nanoscale architectures that are more efficient and better aid future commercialization efforts. (C) 2016 Elsevier Ltd. All rights reserved.