In future, when your mobile phone or tablet runs out of battery, you could just recharge it by putting it out in the sun. Nanyang Technological University (NTU) scientists have developed a next-generation solar cell material that can also emit light, in addition to converting light to electricity. This solar cell is developed from perovskite, a promising material that could hold the key to creating high-efficiency, inexpensive solar cells (see March 2014 issue, p. 36). The new cells not only glow when electricity passes through them, but they can also be customised to emit different colours. Imagine a shopping mall facade that could store solar energy in the day and transform it into a light display for advertisements that glow at night.
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