Perovskite solar cells reach record long-term stability, efficiency over 20 percent

Scientists have greatly improved the operational stability of perovskite solar cells by introducing cuprous thiocyanate protected by a thin layer of reduced graphene oxide. Devices lost less than 5 percent performance when subjected to a crucial accelerated aging test during which they were exposed for more than 1,000 hours to full sunlight at 60°C.

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Social Networking

Twitter to Test Drive Double-Wide Tweets

Twitter has announced a limited test to double the maximum tweet size to 280 characters. Twitter has been struggling to boost user engagement, and its tweet character limitation has been the subject of a longstanding debate among customers and company insiders. One reason for the possible change is to correct for the information imbalance between Asian and western language characters.

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