Synthesis and characterization of push-pull organic semiconductors with various acceptors for solution-processed small molecule organic solar cells

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• 作者：Nara Cho^a ; Jooyoung Kim^a ; Kihyung Song^b ; Jae Kwan Lee^c ; ^{chemedujk@chosun.ac.kr} ; Jaejung Ko^a ; ^{jko@korea.ac.kr}
• 关键词：Bulk heterojunction ; Intramolecular charge transfer ; Electron-withdrawing acceptor ; Organic solar cell ; Organic semiconductor
• 刊名：Tetrahedron
• 出版年：2012
• 期刊代码：107_00404020
• 类别：ch
• 出版时间：27 May, 2012
• 卷：68
• 期：21
• 页码：4029-4036
• 文件大小：949 K

摘要

New efficient push-pull organic semiconductors comprising of the bis(9,9-dimethyl-9H-fluoren-2-yl)aniline (bisDMFA) donor and the various acceptors such as NO₂, DCBP, and TCF, which were linked with bithiophene or vinyl bithiophene 蟺-conjugation bridges, were synthesized, and their photovoltaic characteristics were investigated in solution-processed small molecule organic solar cells (SMOSCs). The intramolecular charge transfers of these materials were effectively appeared in between bisDMFA donor and acceptors, depending on the electron-withdrawing strength of acceptors. The organic semiconductors having NO₂ and DCBP acceptors exhibited the most efficient photovoltaic performance, showing power conversion efficiency (PCE) of 1.98%(卤0.17) and 2.01%(卤0.21), respectively. When the TiO_x thin layer was treated on photoactive layer, the organic semiconductor having NO₂ showed the best PCE of 2.70%with short circuit current of 8.19 mA/cm², fill factor of 0.40, and open circuit voltage of 0.83 V in SMOSC devices.