Impact of Fullerene Molecular Weight on P3HT:PCBM Microstructure Studied Using Organic Thin-Film Transistors
Impact of Fullerene Molecular Weight on P3HT:PCBM Microstructure Studied Using Organic Thin-Film Transistors
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富勒烯分子量对 P3HT:PCBM 微观结构的影响使用有机薄膜晶体管研究
DOI：
10.1002/aenm.201100413
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发表时间：
2011
影响因子：
27.8
通讯作者：
Labram J
中科院分区：
文献类型：
--
作者：
Labram J
采用单层共混和双层有机场效应晶体管（OFFEs）以及原子力显微镜（AFM）研究了C71-丁酸甲酯（PC 71 BM）在聚3-己基噻吩（P3 HT）中的聚集和扩散行为.发现基于P3 HT：PC 71 BM共混物的OFFE 2在退火时发生相分离，这可检测为随着退火温度的升高电子迁移率的下降。通过采用精心设计的双层P3 HT：PC 71 BM OFFE 2，可以从电子迁移率测量中推断出PC 71 BM在P3 HT中的扩散特性。研究发现，P3 HT中可检测到的PC 71 BM聚集和扩散的先决条件退火温度比PC 61 BM高出约20 °C。发现PC61 BM在P3 HT中的扩散系数是PC 71 BM的数倍。目前的工作提供了独特的见解富勒烯在共轭聚合物中的扩散过程，并可能被证明是非常有价值的未来材料开发和器件优化。
The clustering and diffusion of C71‐butyric acid methyl ester (PC71BM) in poly(3‐hexylthiophene) (P3HT) has been studied using single layer blend and bilayer organic field‐effect transistors (OFETs) and by atomic force microscopy (AFM). P3HT:PC71BM blend based OFETs were found to undergo phase‐segregation upon annealing, which was detectable as a fall in electron mobility with increasing annealing temperature. By employing carefully designed bilayer P3HT:PC71BM OFETs, the diffusion‐properties of PC71BM in P3HT could additionally be inferred from electron mobility measurements. It was found that the prerequisite annealing temperatures for detectable PC71BM clustering and diffusion in P3HT was approximately 20 °C higher than for PC61BM. The diffusion coefficient of PC61BM in P3HT was found to be several times higher that that of PC71BM. The present work provides unique insights into the diffusion process of fullerenes in conjugated polymers and could prove highly valuable for future materials development and device optimization.