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Published on: March 2, 2021
A Dendrite-Structured RbX (X=Br, I) Interlayer for CsPbI2 Br Perovskite Solar Cells with Over 15 % Stabilized
Jingjing He1, Bing Ge1, Yu Hou1
1[Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China.
Abstract:
Interface engineering has shown great potential to improve the photovoltaic performance and long-term stability of perovskite solar cells. Herein, RbX (X=Br, I) materials were developed as the interfacial modifiers for CsPbI2 Br solar cells that realized power conversion efficiencies (PCE) over 15 % with a high open-circuit voltage (VOC ) of 1.27 V. The RbX interlayer having a dendrite-shaped structure could optimize the surface wetting behavior of TiO2 films and thus enabled formation of high-quality perovskite films. More importantly, RbX could better align the devices' energy levels and passivate surface defects because of its large bandgap. The PCE of a CsPbI2 Br device with RbX interlayer remained 87 % of its initial efficiency for 800 h in ambient atmosphere.
