Perovskite Solar Cell Using Binary Iodide Gel Polymer Electrolytes

Abstract

Methylammonium lead iodide (MAPbI 3 ) perovskite is a promoting material used nowadays as photo-sensitizer in solar photovoltaic devices due to its excellent properties and promising higher conversion efficiency up to 22%. In perovskite solar Z cells, Spiro-MeOTAD is the most common material used as hole conductor which play the role to transfer electrons from counter electrode to perovskite. However, this hole conductor materials are expensive. Thus, in this work we attempted to use gel polymer electrolyte (GPE) with redox mediator instead of Spiro-MeOTAD in perovskite solar cell. The perovskite layer was deposited using two-step solution method. GPE with varying composition of TBAI:KI was sandwiched between TiO 2 /perovskite photoanode and platinum counter electrode. The power conversion efficiency (PCE) of 1.44% with short circuit current density (J sc ) of 3.72 mA cm-2, open circuit voltage (V oc ) of 0.60 V and fill factor (FF) of 64.05% was obtained using electrolyte with composition 17.00wt.% PVA-12.52wt.% TBAI-1.39wt.% KI-1.07wt.% I 2 -68.01wt.% DMF under 1 sun light illumination.