Invoking the frequency dependence in square modulated light intensity techniques for the measurement of electron time constants in dye-sensitized solar cells

Hamid M. Ghaithan; Saif M. Qaid; Mahmoud Hezam; Muhemmad B. Siddique; Idriss M. Bedja; Abdullah S. Aldwayyana

doi:10.1117/12.2185921

20 August 2015 Invoking the frequency dependence in square modulated light intensity techniques for the measurement of electron time constants in dye-sensitized solar cells

Hamid M. Ghaithan, Saif M. Qaid, Mahmoud Hezam, Muhemmad B. Siddique, Idriss M. Bedja, Abdullah S. Aldwayyana

Author Affiliations +

Proceedings Volume 9556, Nanoengineering: Fabrication, Properties, Optics, and Devices XII; 955604 (2015) https://doi.org/10.1117/12.2185921
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

Abstract

Dye-sensitized solar cells (DSSCs) have been considered as one of the most promising new generation solar cells. Enormous research efforts have been invested to improve the efficiency of solar energy conversion which is determined by the light harvesting efficiency, electron injection efficiency and undesirable electron lifetime. A simple, cheap and trustable laser-induced photovoltage and photocurrent decay (LIPVCD) technique is adopted in this work in order to determine the electron lifetime (τ_e) and electron transport (τ_tr) in DSSCs. In LIPVCD technique, DSSC is illuminated by a small squared intensity-modulated laser beam. Time-based response of the DSSC is recorded using a transient digitized oscilloscope for further analysis. Frequency-based response was also investigated in this work. The frequency-dependent measurements turned out to be a powerful method to determine electron time constants in a fast, real-time fashion. Measurements were carried out using a standard dye-sensitized solar cell, and results were in excellent agreement with results obtained from traditional IMVSIMPS measurements. Measurements were also performed for a variety of DSSCs, having various electrodes including TiO₂ nanoparticles, TiO₂ nanosheets with exposed {001} facets and ZnO vertically aligned nanowires. Results will also be presented and discussed in this work.

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Hamid M. Ghaithan, Saif M. Qaid, Mahmoud Hezam, Muhemmad B. Siddique, Idriss M. Bedja, and Abdullah S. Aldwayyana "Invoking the frequency dependence in square modulated light intensity techniques for the measurement of electron time constants in dye-sensitized solar cells", Proc. SPIE 9556, Nanoengineering: Fabrication, Properties, Optics, and Devices XII, 955604 (20 August 2015); https://doi.org/10.1117/12.2185921

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