Fluorine‐Substituted Benzotriazole Core Building Block‐Based Highly Efficient Hole‐Transporting Materials for Mesoporous Perovskite Solar Cells

Abstract

Listen

Translate article

Two novel donor–accepter–donor structured hole‐transporting materials based on fluorine‐substituted benzotriazole (BTA) core building blocks (2FBTA‐1 and 2FBTA‐2) are designed and synthesized through molecular regulation. Applying these materials into perovskite solar cells, power conversion efficiencies of 7.55% and 17.94% are obtained for 2FBTA‐1 and 2FBTA‐2, respectively. The better photovoltaic performance of 2FBTA‐2 is attributed to its more suitable energy level, more planar molecular configurations, and higher hole mobility. Moreover, the devices with 2FBTA‐2 as hole transport material (HTM) show good stability in air. The results indicate that BTA is a promising building block for future HTM design.