Morphology evolution via self-organization and lateral and vertical diffusion in polymer: fullerene solar cell blends
Morphology evolution via self-organization and lateral and vertical diffusion in polymer: fullerene solar cell blends
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DOI：
10.1038/nmat2102
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发表时间：
2008-02-01
期刊：
影响因子：
41.2
通讯作者：
Nelson, Jenny
中科院分区：
文献类型：
--
作者：
Campoy-Quiles, Mariano;Ferenczi, Toby;Nelson, Jenny
在微观尺度上控制共混物形态对于优化基于共轭聚合物与富勒烯衍生物的共混物的塑料太阳能电池的功率转换效率至关重要。在区域规则聚（3-己基噻吩）（P3 HT）和可溶性富勒烯衍生物（[6，6]-苯基C-61-丁酸甲酯，PCBM）的本体异质结的情况下，共混物形态和光伏器件性能受到各种处理的影响，包括溶剂的选择，干燥速率，热退火和蒸汽退火。虽然协议有很大不同，但各种技术的最大功率转换效率值是相当的（4-5%）。在本文中，我们证明，这些技术都导致一个共同的安排的组件，其中包括一个垂直和横向相分离的共混物的结晶P3 HT和PCBM。我们提出了一个形态的演变，包括P3 HT链的初始结晶，然后由PCBM分子扩散到成核位点，在那里聚集的PCBM然后生长。
Control of blend morphology at the microscopic scale is critical for optimizing the power conversion efficiency of plastic solar cells based on blends of conjugated polymer with fullerene derivatives. In the case of bulk heterojunctions of regioregular poly(3-hexylthiophene) (P3HT) and a soluble fullerene derivative ([6,6]-phenyl C-61-butyric acid methyl ester, PCBM), both blend morphology and photovoltaic device performance are influenced by various treatments, including choice of solvent, rate of drying, thermal annealing and vapour annealing. Although the protocols differ significantly, the maximum power conversion efficiency values reported for the various techniques are comparable (4-5%). In this paper, we demonstrate that these techniques all lead to a common arrangement of the components, which consists of a vertically and laterally phase-separated blend of crystalline P3HT and PCBM. We propose a morphology evolution that consists of an initial crystallization of P3HT chains, followed by diffusion of PCBM molecules to nucleation sites, at which aggregates of PCBM then grow.