Stepped Light Induced Transient Measurement for Investigating Electron Lifetime in Dye Sensitized Solar Cells

Jae Hong Kim^a, Chang Hee Son^a, Ji Yoon Kang^a, Min Jae Kim^a, Yoon Soo Han^b

^aYeungnam University, Department of Chemical Engineering, Yeungnam University, Dae-dong, Gyeongsan, Gyeongbuk, Gyeongsan, 712, Korea, Republic of

^bCatholic University of Daegu, Department of Advanced Energy Material Science and Engineering Catholic University of Daegu 13-13 Hayang-ro, Hayang-eup, Gyeongsan-si, Gyeongsangbuk-do 712-702, Korea, Republic of

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, Min Jae Kim, 370
Publication date: 5th February 2015

The measurement of electron diffusion coefficients and electron lifetimes of dye sensitized solar cells (DSSCs) is essentially required to characterize the cell performance, further investigate high performance solar cells. In this research, stepped light induced transient measurements (SLIM) of photocurrent and voltage is conducted to estimate the electron diffusion coefficients and electron lifetimes of DSSCs. SLIM methods is relatively simple experiment, which can simplify the optical setup and reduce measuring time. In this method, the light having different laser intensity is irradiated to the solar cells with using chopper for lighting on/off. Through measuring the decays of short circuit current and open circuit voltage, the diffusion coefficient and lifetime of photo-generated electron in DSSCs are estimated, subsequently diffusion length is obtained. In this study, the various kinds of DSSCs is fabricated with employing various organic photosensitizer having different molecular structures, and then their electron diffusion coefficient, lifetime and diffusion length are estimated by performing SLIM experiments. It is observed that the decrease in the probability of charge recombination leads to the increase in the electron lifetime, consequently enhance the photovoltaic performance of DSSCs
stepped light induced transient measurements (SLIM) of photocurrent and voltage
S. Nakade, T. Kanzaki, Y. Wada and S. Yanagida, Stepped Light-Induced Transient Measurements of Photocurrent and Voltage in Dye-Sensitized Solar Cells: Application for Highly Viscous Electrolyte Systems, langmuir 2005, 21, 10803-10807

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