A team of engineers at Stanford University created a solar cell that can generate electricity at night by exploiting temperature differences between the cell and the air. Photovoltaic systems that harvest energy in darkness could reduce the need for batteries that store electricity generated during the day. This could potentially lead to greater electricity access for rural communities across the planet. According to the Stanford team Our approach can provide nighttime standby lighting and power in off-grid and mini-grid applications, where [solar] cell installations are gaining popularity.

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