Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
We report the influence of porosity and pore size on the efficiency of solid-state solar cells fabricated with submicron-thick mesoporous electrodes and a perovskite absorber prepared by the two-step process. We demonstrate an alternative electrode synthesis route that goes beyond traditional paste processing by incorporating a second distribution of nanoparticles composed of ZnO into the TiO2 paste. After calcination to form a mesoporous film, the ZnO nanoparticles are selectively etchable under acidic conditions to lead to additional mesorporosity in the TiO2. The addition of porosity from the removal of ZnO nanoparticles did not significantly affect the lead iodide deposition, but rather improved the conversion efficiency of the reaction with methylammonium iodide. Although the added porosity from ZnO did not significantly change the lead iodide deposition, it could subsequently provide a larger pathway for the subsequent infiltration reaction. Consequently it led the enhancement of the conversion efficiency of lead iodide to methylammonium lead iodide upon exposure to methylammonium iodide solution. We anticipate that this additional mesoporosity control may be beneficial for numerous other applications.
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