Measurements of Electron Lifetime and Electron Transport Time in Dye Sensitized Solar Cells using Laser Induced Photovoltage and Photocurrent Decay

Abdullah Aldwayyana^a, Idriss Bedja^a, Muhemmad Siddique^a, Mahmoud Hezam^a, Saif Qaid^a, Hamid Ghaithan^a

^aPhysics and Astronomy, Science Collage, King Saud University, Saudi Arabia, Riyadh, 11451, Yemen

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Hamid Ghaithan, 012
Publication date: 5th February 2015

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. Sensitization dye used studied DSSCs has an absorption wavelength peak at 532 nm which is obtainable using a proper laser diode. Present LIPVCD technique, using single wavelength, is tested with standard solar cells to give comparable results with other standard techniques (i.e. IMVS, IMPS and OCVD). Measurements are performed at open-circuit and short-circuit for a variety of DSSCs, so that the photovoltage and photocurrent decay data are acquired and interpreted in the time domain. Studied DSSCs are fabricated with various electrodes include TiO₂ nanoparticles and ZnO nanowire based DSSC. It has found that τ_tris much faster than τ_efor all tested cells.

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