Charge Transport and Photocurrent Generation Characteristics in Dye Solar Cells Containing Thermally Degraded N719 Dye Molecules

被引:40
作者
Andersen, Anders Rand [1 ,2 ]
Halme, Janne [3 ]
Lund, Torben [4 ]
Asghar, Muhammad Imran [3 ]
Phuong Tuyet Nguyen [4 ]
Miettunen, Kati [3 ]
Kemppainen, Erno [3 ]
Albrektsen, Ole [1 ]
机构
[1] Univ So Denmark, Inst Sensors Signals & Electrotech SENSE, Fac Engn, DK-5230 Odense M, Denmark
[2] Danish Technol Inst, Dept Plast Technol, Taastrup, Denmark
[3] Aalto Univ, Dept Appl Phys, FIN-00076 Aalto, Finland
[4] Roskilde Univ, Dept Sci Syst & Models, DK-4000 Roskilde, Denmark
关键词
LIGAND SUBSTITUTION KINETICS; IMPEDANCE; 3-METHOXYPROPIONITRILE; MODELS;
D O I
10.1021/jp201658j
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
By deliberately introducing the thermally degraded form of the dye solar cell sensitizer N719 in dye-sensitized solar cells (DSCs) using synthetically prepared N719-TBP ([Ru(L-H)(2)(NCS)(4-tert-butylpyridine)]N-+-(Bu)(4)), we have investigated the devastating influence of this ligand substitution product (N719-TBP) on the performance parameters of the cells. Two types of dyed solar cells, based on either N719 or N719-TBP, have been characterized employing standard current-voltage (I-V) performance test, UV-vis optical spectroscopy, incident photon to current efficiency (IPCE), and electrochemical impedance spectroscopy (EIS) methods. The performance tests show a drastic efficiency reduction of similar to 50% in the N719-TBP containing cells as compared to N719-dyed cells. The lower performance of N719-TBP was caused by lower overall light harvesting efficiency due to ca. 30 nm blue shift in the absorption spectrum of the dye, ca. 50% shorter electron diffusion length due to lower electron recombination resistance, and ca. 14% lower charge separation efficiency, which most likely can be ascribed to decreased dye regeneration efficiency caused by the replacement of one NCS ligand with TBP in the substitution product. The observations made in this study of DSC cells dyed with the substitution product, representing a worst case scenario of cells with 100% degraded dye, are in agreement with the characteristics of N719-dyed solar cells degraded at 85 degrees C, where the effect of ligand substitution is somewhat less pronounced.
引用
收藏
页码:15598 / 15606
页数:9
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