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

[1]卟啉染料对Al/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的共混物组成的有机太阳能电池。我们阐明了Al/P3HT+卟啉肖特基势垒太阳能电池中光电流的增强及其增强机制，其中P3HT是一种区域规整的聚噻吩。不同的取代基的卟啉在电池中使用，以检查哪些因素是占主导地位的光电流增强。从Al侧照射的光电流对于卟啉+P3HT的共混电池比对于卟啉或P3HT的纯电池大得多。光电荷分离主要发生在Al/有机固体界面处有机固体侧约15 nm的狭窄区域内，该区域的电场高达10^5 Vcm ^2。<-1>也就是说，光子在窄的有机固体层中被吸收， 关于我们 电势梯度有效地用于光电流的产生。然而，所观察到的光电流增强并不归因于Al/有机固体界面处的电场的大小，而是归因于光诱导的从卟啉到P3HT的空穴转移的容易性。也就是说，当空穴转移的热力学驱动力大且卟啉和P3HT的共轭平面之间的距离短时，观察到显著的光电流增强。[2] TiO_2/聚噻吩+汞/Au固态太阳能电池的光电流增强研究了一种由透明平坦的无孔TiO_2薄膜作为电子传输层和共轭区域规则聚噻吩作为空穴传输层组成的太阳能电池。在TiO_2/P3 HT/Au复合型太阳能电池中，将汞染料掺入到区域规整的聚噻吩（P3 HT）中，电池性能得到显著提高，在AM 1.5 - 100 mWcm~2的辐照下，电池的能量转换效率为0.32%。<-2>此外，根据接触前各组分材料的能级图和光电流的滤光效应，讨论了其光伏机理。光电荷分离的耗尽层位于TiO_2/Mercury + P_3HT界面的混合固体侧，膜厚大于40nm的区域为耗尽层。[3]掺杂电子受体对TiO_2/聚苯撑乙烯/Au固态太阳能电池性能的增强研究了一种由透明平坦的无孔TiO_2薄膜作为n型半导体和共轭聚合物MEH-PPV作为p型半导体组成的太阳能电池。在TiO_2/MEH-PPV/Au复合型太阳电池中，将电子受体[2-[2-[4-（二甲氨基）苯基]乙烯基]-6-甲基-4H-吡喃-4-亚基]丙二腈（DCM）与电子供体聚[2-甲氧基-5-（2 '-乙烯己氧基）-1，4-亚苯基乙烯基]（MEH-PPV）共混，电池性能得到显著提高。在AM1.5 - 100mWcm-3的辐照下，能量转化率为0.47%。<-2>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