Publication date: 1st April 2013
High efficiency mesoscopic solar cells based on inorganic sensitizers are presented. AMX3 (A=RNH3, M=Pb, X=I) perovskite sensitizers formed in-situ on nanocrystalline TiO2 surface using spin-coating technique. For the case of methylammonium lead iodide (CH3NH3PbI3) perovkite sensitizer, electrochemical junction between CH3NH3PbI3-sensitized 3.6-mm-thick TiO2 film and iodide-based redox electrolyte exhibited a power conversion efficiency (PCE) of 6.5% at AM 1.5 G one sun illumination, which is by far the highest efficiency among the inorganic sensitized electrochemical junction cell. However, chemical instability was the main drawback of the liquid type perovskite-sensitized cell, which was overcome by replacing liquid electrolyte with solid hole transporting spiro-MeOTAD material. A PCE as high as 9.7% at one sun was achieved from CH3NH3PbI3-sensitized 0.6-mm-thick TiO2 film. Moreover, excellent long-term stability was demonstrated even without encapsulation. We have also designed NIR sensitizing quantum dots with light absorption upto 1200 nm. Reinforcement of chemical bonding in PbS quantum dot by doping technology led to photocurrent density approaching 30 mA/cm2, more than 60% improvement compared to bare PbS quantum dot.
[1] Im, J.-H.; Lee, C.-R.; Lee, J.-W.; Park, S.-W.; Park, N.-G. 6.5% efficient perovskite quantum-dot-sensitized solar cell. Nanoscale, 2011, 3, 4088–4093. [2] Kim, H.-S. et al., Lead Iodide Perovskite Sensitized All-Solid-State Submicron Thin Film Mesoscopic Solar Cell with Efficiency Exceeding 9%. Scientific Reports 2012, 2, 591
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