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首页> 外文期刊>Organic Electronics >Stepwise co-sensitization as a useful tool for enhancement of power conversion efficiency of dye-sensitized solar cells: The case of an unsymmetrical porphyrin dyad and a metal-free organic dye
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Stepwise co-sensitization as a useful tool for enhancement of power conversion efficiency of dye-sensitized solar cells: The case of an unsymmetrical porphyrin dyad and a metal-free organic dye

机译：逐步共敏化作为增强染料敏化太阳能电池的功率转换效率的有用工具：不对称的卟啉二聚体和不含金属的有机染料

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摘要

A tertiary arylamine compound (DC), which contains a terminal cyano-acetic group in one of its aryl groups, and an unsymmetrical porphyrin dyad of the type Zn[Porph]-L-H_2[Porph] (ZnP-H_2P), where Zn[Porph] and H-2[Porph] are metallated and free-base porphyrin units, respectively, and L is a bridging triazine group functionalized with a glycine moiety, and were synthesized and used for the fabrication of co-sensitized dye-sensitized solar cells (DSSCs). The photophysical and electronic properties of the two compounds revealed spectral absorption features and frontier orbital energy levels that are appropriate for use in DSSCs. Following a stepwise co-sensitization procedure, by immersing the TiO_2 electrode in separate solutions of the dyes in different sequence, two co-sensitized solar cells were obtained: devices C (ZnP-H_2P/DC) and D (DC/ZnP-H_2P).The two solar cells were found to exhibit power conversion efficiencies (PCEs) of 6.16% and 4.80%, respectively. The higher PCE value of device C, which is also higher than that of the individually sensitized devices based on the ZnP-H_2P and DC dyes, is attributed to enhanced photovoltaic parameters, i.e. short circuit current (J_(sc) = 11.72 mA/cm~2), open circuit voltage (V_(oc) = 0.72 V), fill factor (FF= 0.73), as it is revealed by photovoltaic measurements (J-V curves) and by incident photon to current conversion efficiency (IPCE) spectra of the devices, and to a higher total dye loading. The overall performance of device C was further improved up to 7.68% (with J_(sc) = 13.45 mA/cm~2, V_(oc) = 0.76 V, and FF= 0.75), when a formic acid treated TiO_2 ZnP-H_2P co-sensitized photoanode was employed (device E). The increased PCE value of device E has been attributed to an enhanced J_(sc) value (=13.45 mA/cm~2), which resulted from an increased dye loading, and an enhanced V_(oc) value (=0.76 V), attributed to an upward shift and increased of electron density in the TiO_2 CB. Furthermore, dark current and electrochemical impedance spectra (EIS) of device E revealed an enhanced electron transport rate in the formic acid treated TiO_2 photoanode, suppressed electron recombination at the photoanode/dye/electrolyte interface, as well as shorter electron transport time (τ_d), and longer electron lifetime (τ_e).
机译：叔芳基胺化合物（DC），在其一个芳基中包含一个末端氰基-乙酸基团和Zn [Porph] -L-H_2 [Porph]（ZnP-H_2P）类型的不对称卟啉二元组[Porph]和H-2 [Porph]分别是金属化和游离碱的卟啉单元，L是被甘氨酸部分官能化的桥连三嗪基团，被合成并用于共增感染料敏化太阳能电池的制造。单元（DSSC）。这两种化合物的光物理和电子性质揭示了适用于DSSC的光谱吸收特征和前沿轨道能级。按照逐步共增敏程序，通过将TiO_2电极按不同顺序浸入染料的单独溶液中，获得了两个共增敏太阳能电池：器件C（ZnP-H_2P / DC）和D（DC / ZnP-H_2P）发现这两个太阳能电池分别具有6.16％和4.80％的功率转换效率（PCE）。器件C的较高PCE值也高于基于ZnP-H_2P和DC染料的单个敏化器件的PCE值，这归因于增强的光伏参数，即短路电流（J_（sc）= 11.72 mA / cm 〜2），开路电压（V_（oc）= 0.72 V），填充因数（FF = 0.73），这是通过光伏测量（JV曲线）和入射光子到电流的电流转换效率（IPCE）光谱揭示的设备，并提高了染料的总装载量。使用甲酸处理的TiO_2 ZnP-H_2P时，器件C的整体性能进一步提高到7.68％（J_（sc）= 13.45 mA / cm〜2，V_（oc）= 0.76 V，FF = 0.75）。使用共敏化的光阳极（设备E）。设备E的PCE值增加归因于染料负载增加导致的J_（sc）值增加（= 13.45 mA / cm〜2），而V_（oc）值增加了V_（oc）值（= 0.76 V），归因于TiO_2 CB中的上移和电子密度的增加。此外，装置E的暗电流和电化学阻抗谱（EIS）显示，在甲酸处理的TiO_2光阳极中，电子传输速率提高，在光阳极/染料/电解质界面处的电子复合受到抑制，并且电子传输时间（τ_d）缩短，并且电子寿命更长（τ_e）。

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  • 来源
    《Organic Electronics》 |2014年第7期|1324-1337|共14页
  • 作者

    G.D. Sharma; G.E. Zervaki; P.A.Angaridis; A. Vatikioti; K.S.V. Gupta; T. Gayathri; P. Nagarjuna; Surya Prakash Singh; M. Chandrasekharam; Ajita Banthiya; K. Bhanuprakash; A. Petrou; A.G. Coutsolelos;

  • 作者单位

    R & D Center for Engineering and Science, JEC Group of Colleges, JEC Campus, Kukas. Jaipur 303101, Rajasthan, India;

    Laboratory of Bioinorganic Chemistry, Department of Chemistry, University of Crete, Voutes Campus, P.O. Box 2208, 71003 Heraklion, Crete, Greece;

    Laboratory of Bioinorganic Chemistry, Department of Chemistry, University of Crete, Voutes Campus, P.O. Box 2208, 71003 Heraklion, Crete, Greece;

    Laboratory of Bioinorganic Chemistry, Department of Chemistry, University of Crete, Voutes Campus, P.O. Box 2208, 71003 Heraklion, Crete, Greece;

    Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500 007, India;

    Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500 007, India;

    Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500 007, India;

    Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500 007, India;

    Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500 007, India;

    Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500 007, India;

    Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500 007, India;

    Laboratory of Bioinorganic Chemistry, Department of Chemistry, University of Crete, Voutes Campus, P.O. Box 2208, 71003 Heraklion, Crete, Greece;

    Laboratory of Bioinorganic Chemistry, Department of Chemistry, University of Crete, Voutes Campus, P.O. Box 2208, 71003 Heraklion, Crete, Greece;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Co-sensitization; Dye sensitized solar cells; Formic acid treated TiO_2 photoanode; Power conversion efficiency;

    机译：共敏化;染料敏化太阳能电池;甲酸处理的TiO_2光阳极;功率转换效率;

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