Effects of meso-Diarylamino Group of Porphyrins as Sensitizers in Dye-Sensitized Solar Cells on Optical, Electrochemical, and Photovoltaic Properties
Effects of meso-Diarylamino Group of Porphyrins as Sensitizers in Dye-Sensitized Solar Cells on Optical, Electrochemical, and Photovoltaic Properties
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DOI：
10.1021/jp102486b
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发表时间：
2010-06-17
影响因子：
3.7
通讯作者：
Lemmetyinen, Helge
中科院分区：
文献类型：
--
作者：
Imahori, Hiroshi;Matsubara, Yusuke;Lemmetyinen, Helge
我们首次制备了中二芳胺取代卟啉（顺式-ZnP和反式-ZnP）、中二芳胺取代卟啉（单-ZnP）和不含中二芳胺基（ZnP）的卟啉参考物，研究了取代基数目和位置对卟啉光学、电化学和光伏性能的影响。随着二芳胺基数量的增加，在可见光区域的光收集性能得到改善。光学和电化学HOMO-LUMO间隙与DFT计算结果平行。在采用ticl4处理的密封器件结构的优化条件下，比较了其光伏性能。功率转换效率（eta）依次为：反式ZnP (3.8%) < ZnP(4.4%) <顺式ZnP(5.5%) <单式ZnP（6.5%）敏化TiO2电池。znp敏化太阳能电池中较低的光收集效率（LHE）而不是较高的吸附光子电流效率（APCE）导致了中等的短路电流（J(SC)），而单znp敏化TiO2电池中较高的APCE值和中等的LHE值导致了最高的J（SC）值。考虑到反式znp和顺式znp致敏细胞LHE值的相似性，APCE值与J（SC）值相关。反式znp和顺式znp敏化TiO2电池的开路电位（V-OC）低于单znp和znp敏化TiO2电池。总的来说，四种TiO2电池的J（SC）和V-OC值的差异导致了eta值的差异。本文所获得的基本信息将有助于设计高效染料敏化太阳能电池中卟啉的分子结构。
We have prepared meso-bis(diarylamino)-substituted porphyrins (cis-ZnP and trans-ZnP), meso-diarylamino-substituted porphyrin (mono-ZnP), and porphyrin reference without the meso-diarylamino group (ZnP) to evaluate the effects of substituent number and position of the diarylamino groups on the optical, electrochemical, and photovoltaic properties of the porphyrins for the first time. With increasing the number of the diarylamino groups, the light-harvesting properties were improved in the visible region. The optical and electrochemical HOMO-LUMO gaps were parallel to those estimated by DFT calculations. The photovoltaic properties were compared under the optimized conditions in which a sealed device structure with TiCl4-treated, TiO2 double layers was used. The power conversion efficiency (eta) was in the order of the trans-ZnP (3.8%) < ZnP (4.4%) < cis-ZnP (5.5%) < mono-ZnP (6.5%) sensitized TiO2 cells. The low light-harvesting efficiency (LHE) rather than the high adsorbed photon-to-current efficiency (APCE) in the ZnP-sensitized solar cell leads to the moderate short circuit current (J(SC)), whereas both the high APCE value and the moderate LHE value in the mono-ZnP-sensitized TiO2 cell result in the highest J(SC) value. Considering the similarity in the LHE values of the trans-ZnP and cis-ZnP-sensitized cells, the APCE values correlate the J(SC) values. The open circuit potentials (V-OC) of the trans-ZnP and cis-ZnP-sensitized TiO2 cells are lower than those of the mono-ZnP and ZnP-sensitized TiO2 cells. Overall, the difference in the J(SC) and V-OC values of the four TiO2 cells leads to that in the eta values. The basic information obtained here will be useful to design molecular structures of porphyrins for highly efficient dye-sensitized solar cells.