Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
The recent developments in the design and synthesis of perovskites for solid state solar cells have led to remarkable power conversion efficiency beyond 15%, making them an emerging PV technology.1,2 Until now, Spiro-OMeTAD is used as hole transport material (HTM) for fabrication of efficient mesoscopic solar cells. However, the high cost and low hole mobility of spiro-OMeTAD remains as bottleneck for commercialization. In this direction, various inorganic and organic HTMs are being explored. Here, we report a new solution processable, PX as HTM, for mesoscopic CH3NH3PbI3-sensitized solar cells and investigate the differences in the charge recombination, charge transport, and the light-to-current conversion process by the J-V characteristics and electrochemical impedance spectroscopy (EIS). This PX is potentially much cheaper and exhibits relatively higher hole mobility than Spiro-OMeTAD. The obtained open-circuit voltage (Voc) for the devices with PX was higher compared to pristine Spiro-OMeTAD based devices. Further, the effect of the common additives to the PX HTM, was also investigated and it was found that addition of additives in PX improved the device performance and reaching the power conversion efficiency close to 11%. By the optimization of additives, similar recombination resistance to that of Spiro-OMeTAD device was obtained. The obtained similar recombination behavior and open circuit voltage to that of Spiro-OMeTAD, put forward PX, as a potential candidate to replace the cost uneffective Spiro-OMeTAD. Further optimization of concentration, solvent and additives loadings will pave better results.
1. Burschka, J.; Pellet, N.; Moon, S.-J.; Humphry-Baker, R.; Gao, P.; Nazeeruddin, M. K.; Gratzel, M. Sequential deposition as a route to high-performance perovskite-sensitized solar cells. Nature 2013, 499, 316-319 2. Kazim, S.; Nazeeruddin, M. K.; Grätzel, M; Ahmad, S. Perovskite as Light Harvester: A Game Changer in Photovoltaics. Angew. Chem. Int. Ed.2014, 53, 2812–2824.
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