Molecular design of ruthenium(II) polypyridyl photosensitizers for efficient nanocrystalline TiO2 solar cells
Molecular design of ruthenium(II) polypyridyl photosensitizers for efficient nanocrystalline TiO2 solar cells
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DOI：
10.1016/s1010-6030(03)00027-3
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发表时间：
2003-06-02
影响因子：
4.3
通讯作者：
Arakawa, H
中科院分区：
文献类型：
--
作者：
Islam, A;Sugihara, H;Arakawa, H
以多吡啶为配体的过渡金属配合物在染料敏化太阳能电池中的应用越来越广泛。为了进一步提高该电池的效率，需要增强敏化剂在较低能量下的光谱响应。本文综述了纳米晶tio2基太阳能电池用钌多吡啶配合物的分子设计。Ru（4,4'-二羧基-2,2'-双喹啉）(2)(NCS)(2)/TiO2体系的电池效率较低可能是由于在电子转移过程中起关键作用的激发态氧化电位较低。Ru（2-（2-（4-羧基吡啶基））-4-羧基喹啉）(2)(NCS())2，当锚定在纳米TiO2薄膜上时，在整个可见光范围内（延伸至900 nm）实现了高效的敏化，入射光子到电流的转换效率（IPCE）为55%。Ru（4-4-二羧基-2,2-苯环吡啶）(2)（乙基-2-氰基-3,3-二巯基丙烯酸酯）的电池效率低可能是由于电荷注入TiO2后碘离子给电子使染料再生缓慢所致。调整HOMO和LUMO能级表明，与SCE相比，高效敏化剂的基态和激发态氧化还原电位分别为0.5 V和-0.8 V。钌菲罗啉配合物的瞬态吸收研究表明，电子注入效率受增敏染料羧基数目的强烈影响。二酮酸络合物[Ru（4-4′-二羧基-2,2′-旁吡啶）2（乙酰丙酮）]Cl，当锚定在纳米晶TiO2薄膜上时，在整个可见区域实现了非常有效的敏化，产生60%的IPCE。研制了一系列新型三羧基三吡啶-二酮酮（NCS）型全色增敏剂。Ru（4,4',4"-三羧基- 2,2,6 ',2"-三吡啶）（1,1,1-三氟丁烷-2,4-dionato）（NCS）实现了纳米晶TiO2太阳能电池在整个可见光范围内的高效敏化，延伸到近红外区域，并在600 nm左右显示最大值，其中IPCE接近70%的高值。(C) 2003 Elsevier Science B.V.版权所有
Transition metal complexes using polypyridine ligands are finding increasing use in the dye sensitized solar cells. To improve further the efficiency of this cell, an enhanced spectral response of the sensitizer in the lower energies is required. In this paper we review our effort in the molecular design of the ruthenium polypyridyl complexes for nanocrystalline TiO2-based solar cells. The poor cell efficiency in Ru(4,4'-dicarboxy-2,2'-biquinoline)(2)(NCS)(2)/TiO2 system may be ascribed to the low excited-state oxidation potential, which plays a crucial role in the electron-transfer process. Ru(2-(2-(4-carboxypyridyl))-4-carboxyquinoline)(2)(NCS())2, when anchored to nanocrystalline TiO2 films, achieves efficient sensitization over the whole visible range extending up to 900 nm, yielding incident photon-to-current conversion efficiency (IPCE) of 55%. The low cell efficiency of Ru(4-4-dicarboxy-2,2-bypyridine)(2)(ethyl-2-cyano-3,3-dimercaptoacrylate) may be due to slow regeneration of the dye by electron donation from iodide following charge injection into the TiO2. Tuning of HOMO and LUMO energy level show that an efficient sensitizer should possess ground-state and excited-state redox potentials of 0.5 and -0.8 V vs. SCE, respectively. Transient absorption studies of Ru phenanthroline complexes show that the efficiency of electron injection is strongly affected by the number of carboxyl groups of the sensitizing dye. The beta-diketonate complex [Ru(4-4'-dicarboxy-2,2'-bypyridine)2(acetylacetonato)]Cl, when anchored to nanocrystalline TiO2 films, achieves very efficient sensitization across the entire visible region, yielding 60% IPCE. A new series of panchromatic sensitizers of Ru(tricarboxyterpyridine)(beta-diketonato)(NCS) type have been developed. Ru(4,4',4"-tricarboxy-2,2: 6',2"-terpyridine)(1,1,1-trifluoropentane-2,4-dionato)(NCS) achieved an efficient sensitization of nanocrystalline, TiO2 solar cells over the whole visible range extending into near IR region and displaying a maximum around 600 nm, where IPCE approaches a high value of 70%. (C) 2003 Elsevier Science B.V. All rights reserved.