Perovskite solar cells based on small molecule hole transporting materials

Abstract

This review gives an overview of the design and development of perovskite solar cells with a main focus on hole transporting materials (HTMs). The recent advances in metal halide perovskite solar cells surprised the traditional photovoltaic community. A key advance was subsequently made by replacing liquid electrolytes with solid state HTMs like spiro-OMeTAD, which not only improve power conversion efficiency but also enhance the cell stability. As a result, many research groups, including our group, have become involved in the synthesis of new HTMs to optimize the photovoltaic properties of perovskite solar cells (PSCs).