Red-color-modulated perovskite solar cells with copper(I) thiocyanate/cellulose acetate-based distributed Bragg reflectors

This study investigates the development of perovskite solar cells (PSCs) equipped with distributed Bragg reflectors (DBRs) through a coating-based fabrication technique. The incorporation of DBRs enhanced the esthetic appeal and improved the light absorption properties of PSCs, rendering them suitable for building-integrated photovoltaics (BIPV). The DBRs, composed of 3–11 layers of copper(I) thiocyanate and cellulose acetate, exhibited peak reflectance at 700 nm. However, as the number of DBR layers increased, there was a corresponding decrease in short-circuit current density ( J sc ) and power conversion efficiency (PCE) due to greater light reflection. Specifically, compared with PSCs without DBRs, those with 11-layer DBRs showed 41.2% and 39.0% reduction in J sc and PCE, respectively. Despite these reductions, this study highlights the potential of colored PSCs for practical BIPV applications, achieving a balance between esthetics and efficiency.