1-D Linear Photonic Crystals Enable Narrow-Band Perovskite Photodetectors by High-Throughput Optical Model

The responsive properties of perovskites in the visible light band make them potential as novel visible light photodetectors. Since the absorption band of perovskite is usually broad, the narrow-band absorption of perovskite photodetectors is difficult to realize. To improve the narrow-band absorption of perovskite photodetectors, the tuning of the device structure is particularly necessary. However, the tuning inside the device involves energy band matching, optimization of electrical properties, and fabrication process. In this work, we calculated and designed photonic crystal filters in the structure of LiF/MoO3 pairs that can enhance the narrow-band absorption of perovskite photodetectors through high-throughput optical model. Characterizing the performances of the perovskite photodetector based on methylammonium lead iodide (MAPbI3) with photonic crystals, the device demonstrated responsivity of 0.1 A/W, specific detectivity of <tex-math notation="LaTeX">2.6× 10^12 </tex-math> Jones, and linear dynamic range (LDR) 124 Hz. By ensuring the performance of the target band is not significantly weakened, the detector's response to the nontarget band is significantly weakened.