Mesoporous TiO2 Microsphere Synthesized by Continuous Spray Pyrolysis for Perovskite Solar Cells
Viresh Dutta a, Charu Dwivedi a, Anuj Kumar a, Neha Chaturvedi a, Sanjay Kumar Swami a
a Indian Institute of Technology Delhi, New Delhi, Photovoltaic Lab, Center for Energy Studies, IIT Delhi, New Delhi, 110016
International Conference on Hybrid and Organic Photovoltaics
Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Ecublens, Switzerland, 2014 May 11th - 14th
Organizers: Michael Graetzel and Mohammad Nazeeruddin
Oral, Viresh Dutta, presentation 232
Publication date: 1st March 2014

Perovskite solar cell is emerging as an interesting area of research recently due to the benefits of high efficiency using low cost materials. Use of a scattering layer of TiO2 microspheres in DSSCs is well known for improved efficiency[1]. In the present study TiO2 hollow spheres (HSs) synthesized by Continuous Spray Pyrolysis(CoSP) have been used as mesoporous photoanode in organic-inorganic hybrid perovskites solar cell. As synthesized TiO2 hollow spheres were about 170-300 nm in size. Prior to deposition of the TiO2 HSs mesoporous layer by spin coating, a ~70 nm-thick TiO2 blocking layer was deposited by spin-coating of 40 μL 2M TiCl4 aqueous solution onto the FTO coated glass substrate. Subsequently the CH3NH3PbI3 was deposited onto the photoanode using sequential deposition method[2] and spiro-OMeTAD was used as a hole transport material. Under one sun illumination (100mWcm-2), the resulting device exhibits a short-circuit current density (JSC) of 14.52 mAcm-2, an open-circuit voltage (VOC) of 850 mV and a fill factor (FF) of 0.48, resulting in an overall power conversion efficiency of 5.93 %.This establishes that  large size TiO2 HSs can perform  well in the synthesis of perovskites solar cells and shows that these particles can  play an important role in the fabrication of high efficiency organic-inorganic hybrid perovskite solar cells.

Acknowledgement:

This work was done under the guidance of Dr. Md. Mohammad K. Nazeeruddin, Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Federale de Lausanne(EPFL), Lausanne-1015, Switzerland. Authors are also thankful to Mohammad Ibrahim Dar for his support in this work.


J-V characteristics of TiO2 HSs used as mesoporous layer in organic-inorganic hybrid perovskite solar cells
1.Dwivedi, C.; Dutta, V.; Chandiram, A. K.; Nazeeruddin, Md. K.; Gratzel, M. TiO2 Hollow Microspheres Fabricated by Continuous Spray Pyrolysis as a Scattering layer in Dye-Sensitised Solar Cells. Energy procedia 2013, 33, 223-227. 2.Burschka, J.; Pellet, N.; Moon, S. J.; Baker, R. H.; Gao, P.; Nazeeruddin, M. K.; Gratzel, M. Sequential Deposition as a route to High-Performance Perovskite-sensitised Solar Cells. Nature 2013, 499,316-320.
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