Abstract
Alcohol soluble titanium chelate TIPD (titanium (diisopropoxide) bis(2,4-pentanedionate)) was used as electron transporting layer to form an ohmic contact with the negative electrode, aiming to enhance the charge extraction and suppress the charge recombination for high performance CH3NH3PbI3/PCBM-based PHJ perovskite solar cells. The TIPD layer shows excellent suitability to CH3NH3PbI3 perovskite synthesized from different methods. For one-step synthesized CH3NH3PbI3, The power conversion efficiency (PCE) of the device with TIPD buffer reaches 8.75%, with nearly 33% increase in comparison with the device without the buffer layer (6.58%). For two-step synthesized CH3NH3PbI3, an open-circuit voltage (Voc) of 0.89 V, a short-circuit current density (Jsc) of 22.57 mA/cm2, and a fill factor (FF) of 64.5%, corresponding to a PCE of 12.95% for the device with TIPD buffer layer, which is among the best performance reported in literatures for CH3NH3PbI3/PCBM-based PHJ perovskite solar cells.
© 2015 Optical Society of America
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