Performance Enhancement by Dye-sensitization in Thin Layer Organic Solar Cells consisting of Conjugated Polymer

[1]卟啉染料对铝/聚噻吩肖特基势垒电池光电流的敏化作用我们制备了一种有机太阳能电池，该电池由可溶性共轭聚合物作为更好的电荷传输材料和染料作为更有效的捕光材料组成。阐明了Al/P3HT+卟啉肖特基势垒太阳电池的光电流增强效应及其增强机理，其中P3HT是一种区域规则的聚噻吩型化合物。在细胞中加入了不同取代基的不同的卟啉，以考察哪些因素对光电流的增强起主导作用。卟啉+P3HT混合细胞从铝侧照射的光电流比单纯的卟啉或P3HT细胞大得多。光电荷分离主要发生在Al/有机固体界面上有机固体一侧约15 nm的狭窄区域内，电场最大可达105Vcm~(-1)。也就是说，在具有…的窄有机固体层中吸收的光子更多的电位梯度被有效地用于光电流的产生。然而，观察到的光电流增强并不是由于Al/有机固体界面上电场的大小，而是由于从卟啉到P3HT的光致空穴转移的容易。也就是说，当空穴转移的热力学驱动力较大时，当卟啉和P3HT共轭平面之间的距离较小时，可以观察到显著的光电流增强。[2]研究了由透明平坦的无孔二氧化钛薄膜作为电子传输层，以共轭区域规则聚噻吩膜作为空穴传输层的固体太阳电池中的光电流增强现象。在TiO2/P3HT/Au夹心型太阳电池中加入花菁染料后，电池性能得到显著提高，在AM1.5-100mWcm~(-2)~(-2)的辐照下，电池的能量转化率达到0.32%。根据元件材料接触前的能级图和光电流的光学滤波效应，对光伏机理进行了讨论。光电荷分离的耗尽层位于二氧化钛/花菁+P3HT界面的混合固体一侧，薄膜厚度约为40 nm以上。[3]研究了在二氧化钛/聚苯乙炔/金固体太阳电池中掺入电子受体提高电池性能的方法，该固态太阳能电池由透明平坦的无孔二氧化钛薄膜作为n型半导体和共轭聚合物MEH-PPV作为p型半导体组成。当[2-[2-[4-(dimethylamino)phenyl]ethenyl]-6-methyl-4H-pyran-4-ylidene]propanedinitrile(DCM)作为电子受体与poly[2-methoxy-5-(2‘-ethylenehexyloxy)-1，4-phenylenevinylene(MEH-PPV)共混作为供体时，在TiO2/MEH-PPV/Au夹心型太阳电池中，电池的性能显著提高。在AM1.5~100 mW·cm~(-2)~(-2)的辐照下，能量转化率为0.47%。较少

[1]Sensitization effect of porphyrin dye on photocurrent of Al/polythiophene Schottky-barrier cellsWe prepared organic solar cells consisting of a blend of soluble conjugated polymer as better charge-transport material and dye as more effective light-harvesting material. We clarified the photocurrent enhancement in the Al/P3HT+porphyrin Schottky-barrier solar cell and the enhanced mechanism, where P3HT is a regioregular polythiophene. Various porphyrins with different substituents were employed in the cell to examine which factors are dominant for the photocurrent enhancement. The photocurrent for irradiation from the Al side was much larger for the blend cell of porphyrin+P3HT than for the pure cell of porphyrin or P3HT. The photo-charge separation mainly occurred in the narrow region of about 15 nm of organic solid side at the Al/organic solid interfaces, where the electric field was as large as 10^5 Vcm^<-1>. That is, photons absorbed in the narrow organic solid layer which has the … More potential gradient were effectively used for the photocurrent generation. However, the observed photocurrent enhancement was not attributed to the magnitude o」 the electric field at the Al/organic solid interface, but to the ease of the photoinduced hole-transfer from porphyrin to P3HT. That is, when the thermodynamic driving force of the hole-transfer was large and the distance between conjugated planes of porphyrin and P3HT was short, remarkable photocurrent enhancement was observed.[2]Photocurrent enhancement in TiO_2/polythiophene+merocyanine/Au solid-state solar cellsA solar cell consisting of a transparent and flat, that is, non-porous TiO_2 film as the electron-transporting layer and a conjugated regioregular polythiophene as the hole-transporting layer was investigated. When a merocyanine dye was blended into the regioregular polythiophene (P3HT) in the TiO_2/P3HT/Au sandwich-type solar cell, the cell performance was remarkably enhanced, resulting in 0.32 % of energy conversion yield under the irradiation of AM1.5-100mWcm^<-2>. Further, the photo-voltaic mechanism was discussed on the base of the energy level diagram of the component materials before contact and so-called an optical filtering effect of the photocurrent. The depletion layer for the photo-charge separation lies in the blended solid side at the TiO_2/merocyanine+P3HT interface, and the film thickness of more than 40nm is estimated as the region.[3]Performance enhancement by blending an electron acceptor in TiO_2/polyphenylenevinylene/Au solid-state solar cellsA solar cell consisting of a transparent and flat, that is, non-porous TiO_2 film as an n-type semiconductor and a conjugated polymer MEH-PPV as a p-type semiconductor was investigated. When [2-[2-[4-(dimethylamino)phenyl]ethenyl]-6-methyl-4H-pyran-4-ylidene]propanedinitrile (DCM) as an electron acceptor was blended into poly[2-methoxy-5-(2'-ethylenehexyloxy)-1,4-phenylenevinylene (MEH-PPV) as a donor in the TiO_2/MEH-PPV/Au sandwich-type solar cell, the cell performance was remarkably enhanced. After all, the energy conversion yield resulted in 0.47 % under the irradiation of AM1.5-100mWcm^<-2>. Less