Solar panels use hydrogel to stay cool (IMAGE) Cell Press Caption This photograph shows the solar photovoltaic panels, which use a water-absorbing hydrogel underneath to help stay cool and increase their efficiency. Credit Renyuan Li Usage Restrictions Credit must be given to the creator. Adaptations must be shared under the same terms. License CC BY-SA Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.