When engineers build a self-powered IoT device, 90% of the effort goes into photovoltaic conversion efficiency—30% versus 35%, endlessly debated. But anyone who has actually deployed field devices knows the truth: systems rarely die from insufficient generation. They die on the storage side. A week
The cost-reduction paths for space GaAs solar cells are narrowing simultaneously from two independent directions. 1. Push “Thinness” to the Limit and Recover What Is “Expensive” Flexible gallium arsenide (GaAs) solar cells less than 0.1 mm thick are being efficiently produced on production lines, we
It weighs less than a grain of rice and carries no battery. Yet this 0.066 g tag—attached to a monarch’s thorax with eyelash glue—uses a rice-sized solar cell to power a passive Bluetooth transmitter that a phone can receive nearly 100 m away. How?The energy budgetKnown: 0.066 g, passive Bluetooth,
