Unoccupied states in copper phthalocyanine/fullerene blended films determined by inverse photoemission spectroscopy

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• 作者：Kouki Akaike ; Andreas Opitz ; Julia Wagner ; Wolfgang Brü ; tting ; Kaname Kanai ; Yukio Ouchi ; Kazuhiko Seki
• 关键词：Donor/acceptor blend ; Unoccupied states ; Inverse photoemission spectroscopy ; Electronic structure ; Organic photovoltaics
• 刊名：Organic Electronics
• 出版年：2010
• 出版时间：November 2010
• 年：2010
• 卷：11
• 期：11
• 页码：1853-1857
• 全文大小：518 K

文摘

Blends of copper phthalocyanine (CuPc) and fullerene (C₆₀) have successfully been used for organic field-effect transistors and photovoltaic cells. In this work we investigate the unoccupied states of CuPc/C₆₀ blends by inverse photoemission spectroscopy. The energies of the lowest unoccupied molecular orbitals of CuPc and C₆₀ vary linearly with the mixing ratio, which is consistent with the energy shifts of the vacuum level, the highest occupied molecular orbitals and core levels. The observed results can be interpreted as unchanged electron affinities of CuPc and C₆₀ in the blended films due to nano-phase separation.