Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Quantum dots (QDs) composed of compound semiconductors have been attracting increasing attention as promising sensitizer candidates for photovoltaic device due to their tunable band gap, high absorption coefficient, and multiple exciton generation (MEG) and extraction of hot electrons. As to overcome the organic solvent leakage of liquid-state photovoltaic device, the liquid-electrolyte can be replaced by solid electrolyte to fabricate solid state device. However, the obtained device exhibits poor performance due to low photocurrent. It is a challenge to improve the performance of solid state photovoltaic device. Herein, a solid-state quantum dots sensitized solar cell (QDSSC) composed of CdSe quantum dot as light harvesters and TiO2 and 2, 2′,7,7′-tetrakis-(N, N-di-p-methoxyphenylamine)-9, 9′-spirobifluorene (spiro-OMeTAD) as electron and hole conductors, respectively. The chemical bath deposit (CBD) approach was applied to directly deposit CdSe QDs on the surface of TiO2 nanocrystals. The CdSe QDs sensitized TiO2 nanostructure electrode was annealed at the temperature of 100-450 °C, and the effects of annealing treatment on optical, crystalline and photovoltaic performance were studied. The improved photovoltaic performance QDSSC was obtained using the annealed CdSe QDs sensitized TiO2 nanostructure electrode. After annealed treatment, the photocurrent density is 0.35 mA/cm2 increased by ~98.9 %, power conversion efficiency is 0.053% increased by 155.3 % comparing with without annealed treatment QDSSC. The improvement performance is due to the crystalline quality, attachment between CdSe QDs and TiO2 nanocrystals, and optical properties were enhanced caused by annealing treatment.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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