Enhancement of Photocurrent of Dye-Sensitized Solar Cell by Composite Liquid Electrolyte Including NiO Nanosheets
Abstract:A novel composite electrolyte incorporating inorganic NiO nanosheets into iodide/triiodide liquid electrolyte containing 4-tert-butylpyridine (TBP) for dye-sensitized solar cells (DSCs) was reported herein for the first time. The hydrothermally prepared NiO nanosheets showed a high aspect ratio, confirmed by field emission scanning electron microscopy (FESEM). DSCs assembled with such nanosheet-based composite electrolytes showed more than 15% increased photocurrent, and hence significantly promoted light-to-energy conversion efficiency relative to reference one. The enhancement of photocurrent is primarily due to the light-scattering effect which is brought by the incorporating of inorganic nanosheets. Also, electrochemical impedance spectroscopy (EIS) was employed to investigate the charge-transfer kinetics at the interface between the counter electrode and the composite electrolyte of DSCs. The symmetrical cells (TCO/Pt/electrolyte/Pt/TCO) assembled with such nanosheet-based composite electrolyte showed a decreased charge-transfer resistance (Rct). The optimum DSC including NiO nanosheets showed a short-circuit current of 14.01 mA/cm2, an open-circuit voltage of 0.73 V, a fill factor of 0.54, and an overall conversion efficiency of 5.44% at 100 mW/cm2.
Document Type: Research Article
Publication date: 2010-11-01
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- Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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