No abstract

No abstract

Current developments and challenges in energyefficient windows for building integration relate to the design and realization of high-performance, durable electrochromic devices and semitransparent photovoltaic cells. Photovoltachromic devices combine the photovoltaic and electrochromic functionalities in a self-powered, stand-alone smart device enabling energy production from sunlight and adaptive daylight modulation without any additional external power supply. Herein, we present for the first time the features of an all-solid-state photovoltachromic device assembled entirely on a single-glass substrate with a simplified structure in which high-performance perovskite solar cells are capable of driving autonomously a fast (c.a. 15 s) and deep coloration of the electrochromic unit (ΔT avt = 22%; ΔT 650 = 30%). Such a multifunctional single-substrate device guarantees high aesthetics and transparency exhibiting increased photovoltaic performances with superior light power conversion efficiency (maximum 12.2%) when compared with the quasi-solid and solid-state photovoltachromics. The integration of an all-solid-state EC unit with semitransparent perovskite solar cells on a single-substrate photovoltachromic module allows for smart energy management by the dynamic control of solar radiation, enabling at the same time the generation of surplus energy by a PV system for additional uses or under cloudy conditions and less sunny hours of the day.

The industrialization of perovskite solar cells relies on solving intrinsic‐to‐material issues. To reach record efficiencies perovskite deposition needs to be finely adjusted by multi‐step processes, in a humidity free glove‐box environment and by means of hardly scalable techniques often associated with toxic solvents and anti‐solvent dripping/bath. Herein, the use of polymeric material is proposed to deposit perovskite layers with easy processability. To the scope, a starch‐polymer/perovskite composite is developed to suit slot‐die coating technique requirement, allowing the deposition of hybrid halide perovskite material in a single straightforward step without the use of toxic solvents, and in uncontrolled humid environment (RH up to 70 %). The starch‐polymer increases the viscosity of the perovskite precursor solutions and delays the perovskite crystallization that results in the formation of perovskite films at mild temperature (60 °C) with good morphology. These innovative inks enables the fabrication of flexible solar cells with p‐i‐n configuration featured by a power conversion efficiency higher than 3 %. . Overall, this approach can be exploited in the future to massively reduce perovskite manufacturing costs related to keeping the entire fabrication line at high‐temperature and under nitrogen or dry conditions.