Fluorine-Substituted Benzotriazole Core Building Block-Based Highly Efficient Hole-Transporting Materials forMesoporous Perovskite Solar Cells

摘要

Two novel donor–accepter–donor structured hole-transporting materials basedon fluorine-substituted benzotriazole (BTA) core building blocks (2FBTA-1 and2FBTA-2) are designed and synthesized through molecular regulation. Applyingthese materials into perovskite solar cells, power conversion efficiencies of 7.55%and 17.94% are obtained for 2FBTA-1 and 2FBTA-2, respectively. The betterphotovoltaic performance of 2FBTA-2 is attributed to its more suitable energylevel, more planar molecular configurations, and higher hole mobility. Moreover,the devices with 2FBTA-2 as hole transport material (HTM) show good stability inair. The results indicate that BTA is a promising building block for future HTMdesign.