Performance of dye-sensitized solar cells based on various sensitizers applied on TiO2-Nb2O5 core/shell photoanode structure

被引:6
作者
Elangovan, R. [1 ]
Joby, N. G. [2 ]
Venkatachalam, P. [2 ]
机构
[1] Bharathiar Univ, Dept Phys, Coimbatore 641046, Tamil Nadu, India
[2] Annamalai Univ, Dept Phys DDE, Annamalainagar, Tamil Nadu, India
关键词
Core/shell photoanode; Various sensitizers; Dye-sensitized solar cell; Photocurrent efficiency; Charge recombination; Electron transport; NANOCRYSTALLINE TIO2; ANCHORING GROUP; ORGANIC-DYES; ELECTRODES; EFFICIENCY; NANOTUBES; RECOMBINATION; IMPEDANCE; TRANSPORT; SURFACE;
D O I
10.1007/s10008-014-2394-2
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The present investigation described the performance of dye-sensitized solar cells (DSSCs) based on various sensitizers applied on TiO2-Nb2O5 core/shell photoanode film. The novel photoanodes were prepared using composite of TiO2 nanoparticles (TNPs) and TiO2 nanorods (TNRs) as core (TNPRs) layer with Nb2O5 shell coating. As well, tantalum pentoxide (Ta2O5), a blocking layer applied over the core/shell film. The DSSCs were fabricated based on various sensitizers namely zinc phthalocyanine, indoline, indigo carmine, zinc porphyrin, N719, coumarin NKX-2700, polymer dye, quantum dots (QDs), perylene and squaraine. The I-V characteristics of the DSSCs, photocurrent density (Jsc), open-circuit voltage (Voc), fill factor (FF), and photoconversion efficiency (PCE) were determined under illumination of AM 1.5 G. Electrochemical impedance spectroscopy (EIS) analysis is carried out to study the charge transport and life-time of charge carriers at photoanode/dye/electrolyte interface of the DSSCs. The I-V and EIS results explicated that the core/shell with blocking layers were able to alleviate the electron transport and suppressed charge recombination at photoanode/dye/electrolyte interface of the DSSCs. Concerning the sensitizers, PCE of the DSSCs exemplify the order N719 > zinc porphyrin > coumarin NKX-2700 > indoline > squaraine > QDs > zinc phthalocyanine > perylene > polymer dye > indigo carmine dye. The results of the present work demonstrated that among the sensitizers studied, N719 showed the highest PCE and fill factor. Besides, the metal-free organic sensitizers (coumarin NKX-2700 and indoline) exhibited comparable PCE as compared to N719.
引用
收藏
页码:1601 / 1609
页数:9
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