유기태양전지에 적용 가능한 작은 밴드갭을 가지는 공중합체의 합성 및 광전변환 특성

Abstract

Mixtures of conjugated polymers and fullerene derivative (PCBM) have been commanded considerable attention for application in organic solar cells. In order to improve their efficiency, the design of new materials that absorb longer wavelengths (or low band gap) at visible light is of bstantial interest. CN groups lower the LUMO energy level of the polymer by increasing the electron affinity and extend the emission wavelength to red and near-infrared range. We synthesied and characterize of new copolymers base on 2-pyran-4-ylidenemalononitrile and derivatives of dialkoxy-divinylbenzene, phenothiazine and fluorene to get low band gap and high Voc. A series of copolymers derivered from 2-pyran-4-ylidene-malononitrile (PM) derivatives such as poly[2-(2,6-dimethylpyran-4-ylidene)malononitrile-alt-1,4-bis(dodecyloxy)-2,5-divinylbenzene] (PM-PPV), poly[2-{2,6-Bis-[2-(5-bromothiophen-2-yl)-vinyl]-pyran-4-ylidene}-malononitrile-alt-1,4-bis(dodecyloxy)-2,5-divinylbenzene] (PMT-PPV) and poly[2-[2,6-Bis-(2-{4-[(4-bromophenyl)-phenylamino]-phenyl}-vinyl)-pyran-4-ylidene]-malononitrile-alt-1,4-bis(dodecyloxy)-2,5-divinylbenzene] (PMTPA-PPV) were synthesized successfully through Heck coupling reaction. poly[2-[2,6-Bis-(2-{4-[(4-butyl-phenyl)-(4-phenyl)-amino]-phenyl}-vinyl)-pyran-4-ylidene]-malononitrile-alt-1,4-bis(dodecyloxy)-2,5-divinylbenzene] (BuPMTPA-PPV), poly[2-[2,6-Bis-(2-{4-[(4-butyl-phenyl)-(4-phenyl)-amino]-phenyl}-vinyl)-pyran-4-ylidene]-malononitrile-alt-3,7-10-hexyl-10H-phenothiazine] (BuPMTPA-PT) and poly[2-[2,6-Bis-(2-{4-[(4-butyl-phenyl)-(4-phenyl)-amino]-phenyl}-vinyl)-pyran-4-ylidene]-malononitrile-alt-2,7-9,9-Dihexyl-9H-fluorene] (BuPMTPA-PF) were synthesized using Heck and Suzuki coupling reaction. Also, the optical, electrochemical, and photovoltaic properties of the blend of new copolymers and PCBM were be discussed.