Heteroleptic ruthenium complexes containing uncommon 5,5′-disubstituted-2,2′-bipyridine chromophores for dye-sensitized solar cells
Heteroleptic ruthenium complexes containing uncommon 5,5′-disubstituted-2,2′-bipyridine chromophores for dye-sensitized solar cells
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DOI：
10.1039/c0dt01043j
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发表时间：
2011-01-01
影响因子：
4
通讯作者：
Wong, Wai-Yeung
中科院分区：
文献类型：
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作者：
Dai, Feng-Rong;Wu, Wen-Jun;Wong, Wai-Yeung
四种新型杂感钌增敏剂[Ru(4，4‘-羧酸-2，2’-联吡啶)(L)(Ncs)(2)](L=5，5‘-bis(4-octylthiophen-2-yl)-2，2’-bipyridine(1)，5，5‘-双(N，N-二苯基-4-氨基苯基)2，2’-联吡啶(2)，5，5‘-双(5-(N，N-diphenyl-4-aminophenyl)-thiophen-2-yl)-2，2’-bipyridine(3)和5，5‘-双(4-辛基-5-(N，合成了N-diphenyl-4-aminophenyl)-thiophen-2-yl)-2，2‘-bipyridine(4))，用物理化学和计算方法对其进行了表征，并将其用作纳米晶染料敏化太阳能电池的光敏剂。这4种Ru染料(527 nm为1、2为585 nm、5 85 nm为3、553 nm为4)的金属-配体电荷转移(MLCT)吸收的最大吸收波长可以通过改变辅助配体的结构来调节，结果表明，增加这种配体的共轭长度会降低MLCT带的能量和摩尔吸收系数。获得了1、2、3和4敏化太阳电池在550 nm、480 nm、470 nm和480 nm的最大入射光子-电流转换效率(IPCE)分别为41.4%、38.6%、39.4%和31.1%。在标准空气质量(AM)1.5光照条件下，敏化剂1、2、3和4分别用于DSC的功率转换效率分别为3.00%、2.51%、2.00%和2.03%(标准N719为5.9%)。
Four new heteroleptic ruthenium sensitizers [Ru(4,4'-carboxylic acid-2,2'-bipyridine)(L)(NCS)(2)] (L = 5,5'-bis(4-octylthiophen-2-yl)-2,2'-bipyridine (1), 5,5'-bis(N, N-diphenyl-4-aminophenyl)2,2'- bipyridine (2), 5,5'-bis(5-(N, N-diphenyl-4-aminophenyl)-thiophen-2-yl)-2,2'-bipyridine (3) and 5,5'-bis(4-octyl-5-(N, N-diphenyl-4-aminophenyl)-thiophen-2-yl)-2,2'-bipyridine (4)) were synthesized, characterized by physicochemical and computational methods, and utilized as photosensitizers in nanocrystalline dye-sensitized solar cells (DSSCs). The lambda(max) of the metal-to-ligand charge transfer (MLCT) absorption of these four ruthenium dyes (527 nm for 1, 535 nm for 2, 585 nm for 3 and 553 nm for 4) can be tuned by various structural modifications of the ancillary ligand and it was shown that increasing the conjugation length of such ligand reduces the energy as well as the molar absorption coefficient of the MLCT band. The maximum incident photon to current conversion efficiency (IPCE) of 41.4% at 550 nm, 38.6% at 480 nm, 39.4% at 470 nm and 31.1% at 480 nm for 1-, 2-, 3- and 4-sensitized solar cells were obtained. Respectable power conversion efficiencies of 3.00%, 2.51%, 2.00% and 2.03% were realized, respectively, when the sensitizers 1, 2, 3 and 4 were used in DSSCs under the standard air mass (AM) 1.5 sunlight illumination (versus 5.9% for standard N719).