New quinoxaline and pyridopyrazine-based polymers for solution-processable photovoltaics

详细信息    查看全文

• 作者：Renee Kroon ; Robert Gehlhaar ; Timothy T. Steckler ; Patrik Henriksson ; Christian M¨¹ller ; Jonas Bergqvist ; Afshin Hadipour ; Paul Heremans ; Mats R. Andersson
• 关键词：Conjugated polymers ; Organic electronics ; Photovoltaic devices ; Polymeric materials ; Solar cells
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：2012
• 出版时间：October, 2012
• 年：2012
• 卷：105
• 期：Complete
• 页码：280-286
• 全文大小：498 K

文摘

The recently published quinoxaline/thiophene-based polymer TQ1 has been modified on its acceptor unit, either altering the acceptor strength by incorporating a pyridopyrazine, substitution of the acceptor-hydrogens by fluorine, or substitution of the alkoxy side chain by alkyl. The changes in physical, electronic and device properties are discussed. For the polymers incorporating the stronger acceptors a decreased performance is found, where in both cases the current in the devices is compromised. Incorporation of the pyridopyrazine-based acceptor seems to result in more severe or additional loss mechanisms compared to the polymer that incorporates the fluorine atoms. A similar performing material is obtained when changing the alkoxy side chain in TQ1 to an alkyl, where the solar cell performance is mainly improved on the fill factor. It is demonstrated that the standard TQ1 structure is easily modified in a number of ways, showing the versatility and robustness of the standard TQ1 structure and synthesis.