Optical characterization of organic blend films integrating metallic nanoparticles

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• 作者：Sylvain Vedraine^a ; Philippe Torchio^a ; ^{philippe.torchio@univ-cezanne.fr} ; Alexandre Merlen^b ; ^{alexandre.merlen@im2np.fr} ; Joanna Bagierek^b ; Franç ; ois Flory^c ; Alexandre Sangar^b ; Ludovic Escoubas^a
• 关键词：Organic photovoltaic ; Silver nanoparticles ; Plasmon ; Raman spectroscopy ; SERS ; FDTD method
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：2012
• 期刊代码：81_09270248
• 类别：ce
• 出版时间：July, 2012
• 卷：102
• 期：Complete
• 页码：31-35
• 文件大小：776 K

摘要

A study of plasmonic phenomena produced by silver nanoparticles embedded in a photoactive (poly-3-hexylthiophene):[6,6]-phenyl-C₆₁-butyric acid methyl ester (P3HT:PCBM) bulk heterojunction is performed via spectrophotometric and Raman characterizations. An enhanced absorption of light is experimentally obtained in a 90 nm-thick P3HT:PCBM interpenetrated blend layer incorporating evaporated 5 nm-thick silver nanoparticles on glass/ITO substrate. An increase of Raman signal is observed and correlated to an increase of the electromagnetic field close to metallic nanoparticles. This is confirmed by Finite-Difference Time-Domain (FDTD) modeling considering an organized 2D-grating of ellipsoidal domes.

This paper shows also that the use of relatively thick organic blend films as probe molecules upon plasmonic structures does not obscure the Raman response.