Solar-Powered Ambipolar Electrochromic Polyimidothioethers Via Perovskite Photovoltaics

Tuesday, 26 May 2015: 17:00
Conference Room 4E (Hilton Chicago)
H. J. Yen, H. Tsai, W. Nie (Los Alamos National Laboratory), G. S. Liou (National Taiwan University), and H. L. Wang (Los Alamos National Laboratory)
In this work, we demonstrate for the first time the novel electrochromic devices based on a series of ambipolar polyimidothioethers (PITEs) driven by state-of-the-art solution-processed perovskite solar cells. These devices with high color contrast and fast response time can have a low operating voltage, less than one volt. The electrochromic PITEs were prepared from new triphenylamine-based bismaleimides and commercial dithiols via Michael polyaddition. These polymers were readily soluble in various organic solvents and showed thermal stability associated with high glass-transition temperatures. The perovskite solar cell developed in our lab has a power conversion efficiency greater than 15% and open circuit voltage of 0.8-0.9 V, rivals the efficiency and cost of silicon solar cells in converting sunlight to electricity. Combined the innovative developments of both perovskite photovoltaics and ambipolar electrochromic materials, we have achieved a novel design of smart materials devices with strong commercial implications.