Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Abstract
It is a well known fact that organic- hole transporting materials and noble metal (such as Au or Pt) based counter electrodes bears a large proportion of the material cost of Perovskite based solar cells which limiting their approach to low-cost photovoltaic devices. Therefore, it is necessary to develop high efficiency low cost hole transporting materials (i.e. inorganic) or hole-conductor free mesoscopic Perovskite solar cells by replacing the noble-metal based counter electrodes with inexpensive and abundantly available materials such as carbon. Herein, we fabricated fully printable low cost mesoscopic Perovskite solar cells with carbon counter electrode using mesoporous TiO2 and NiO layers as electron and hole selective contacts respectively. The mesoscopic TiO2, ZrO2 (as the spacer layer), NiO and carbon counter electrode layers of the device were printed layer by layer through screen printing and the Perovskite (i.e. CH3NH3PbI3) was deposited by a two-step sequential method to infiltrate the CH3NH3PbI3 through porous carbon layer into the inner oxide layers at ambient conductions. The current density-voltage curve of Perovskite solar cell with the NiO layer demonstrated a Jsc of 17.58 mAcm-2, Voc of 0.74 V, FF of 0.49 and an overall device efficiency of 6.4%, whereas, Perovskite solar cell without the NiO layer showed a Jsc of 12.13 mAcm-2, Voc of 0.76 V, FF of 0.57 and an overall device efficiency of 5.2%. The device performance showed that the NiO layer significantly improves the photocurrent density of the printable Perovskite solar cells. Electrochemical impedance spectroscopy was employed to investigate the effect of NiO layer on the photovoltaic performance of the devices. The charge transfer in the device exhibited both capacitive and resistive characters due to the polarization and the higher charge transfer rates through the Perovskite/NiO interface. The impedance study confirmed that the NiO layer promises to greatly enhance the device performance and stability by extracting photo-generated holes efficiently compared to the device without the NiO layer.
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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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