Abstract
Indoor perovskite solar cells (iPSCs) have attracted enormous attention in recent years due to its potential in practical application under indoor illumination, such as supplying power to Internet of Things (IoT) sensors and supporting reliable energy for indoor gadget. Nevertheless, compared with outdoor solar illumination, indoor light sources provide much narrower spectra band and lower intensity. In this case, the ideal bandgap of perovskite materials with spectra response under indoor illumination (~1.9 eV) is relatively larger than traditional outdoor perovskite materials (1.3-1.5 eV).
Quasi-2D perovskite material normally shows better stability than three-dimensional (3D) perovskites. More importantly, quasi-2D perovskite is easily to be adjusted bandgap by changing the number of octahedra between the spacers. However, the indoor application of quasi-2D perovskite materials was rarely reported. In this work, we will investigate quasi-2D perovskite solar cells under indoor illumination. Various properties of quasi-2D indoor perovskite absorber based on different spacers will be discussed. The influence of perovskite film formation from some details in fabrication process also will be illustrated, such as spin speed during spin-coating method, types and proportions of solvents in perovskite precursor, annealing temperature, with or w/o antisolvent etc. Besides, surface modification is utilized to optimal band alignment between perovskite and hole transport layer. And additive engineering is also applied to control the growth of quasi-2D perovskite film in this study.
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