Abstract
Electrochromic devices can modulate their light absorption under a small driving voltage, but the requirement for external electrical supplies causes response-lag. To address this problem, self-powered electrochromic devices have been studied recently. However, insensitivity to the surrounding light and unsatisfactory stability of electrochromic devices have hindered their critical applications. Herein, novel perovskite solar cell-powered all-in-one gel electrochromic devices have been assembled and studied in order to achieve automatic light adjustment. Two alkynyl-containing viologen derivatives are synthesized as electrochromic materials, the devices with very high stability (up to 70000 cycles) serves as the energy storage and smart window, while the perovskite solar cell with power-conversion-efficiency up to 18.3% serves as the light detector and power harvester. The combined devices can automatically switch between bleached and colored state to adjust light absorption with variable surrounding light intensity in real-time swiftly, which establish significant potentials for applications as modern all-day intelligent windows.
Highlights
Electrochromic devices can modulate their light absorption under a small driving voltage, but the requirement for external electrical supplies causes response-lag
To detect the light sensitivity of perovskite solar cell (PSC)-powered electrochromic devices (ECDs), we have investigated the alterations of UV-visible spectrum opposing different light density and monitor the color changes in natural sunlight
As a proof of concept, ECDs with all-in-one gel configuration were combined with PSCs to realize the automatically dynamic light-adjusting
Summary
Electrochromic devices can modulate their light absorption under a small driving voltage, but the requirement for external electrical supplies causes response-lag. Two alkynyl-containing viologen derivatives are synthesized as electrochromic materials, the devices with very high stability (up to 70000 cycles) serves as the energy storage and smart window, while the perovskite solar cell with power-conversion-efficiency up to 18.3% serves as the light detector and power harvester. Xia et al.[12] demonstrated that EC batteries were charged by perovskite solar cell (PSC) accompanied by color changes from transparent to blue color, with reduced graphene (rGO)-connected bilayer NiO nanoflake as the cathode and WO3 nanowire as the anode These investigations dominantly utilized a sandwich configuration with a long-time coloration reservation; the ECD with layer-by-layer structure could turn to a colored state under strong light but failed to convert to transparent immediately when sunlight became weak only if a reverse potential bias was applied. This work may pave a new approach to develop dynamic light-tuning ECD-based commercial smart windows
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