Small Wireless Solar On-site Energy

Solar energy harvesting that provides an alternative power source for an energy-constrained wireless sensor network (WSN) node is completely a new idea. Several developed countries like Finland, Mexico, China, and the USA are making research efforts to provide design solutions for challenges in renewable energy harvesting applications.

As the on-chip solar cells and the energy harvesting system are integrated on the same substrate, the P-type regions in the on-chip solar cells, namely PW and P-sub, are utilized as the cathode and grounded; whereas the N-type regions, DNW and N+, function as the anode for electrical energy output.

Sun-in-one turnkey containerized solar cell tower micro-grids provides a clean, reliable, affordable alternative to diesel generators for the telecom industry. Sun-In-One™'s telecom solar power systems are engineered with three to five days of battery storage compared to other companies that have only one day or less of battery storage.

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This paper demonstrates a highly efficient on-chip solar cell design that achieves 25.79% photoelectric conversion efficiency by reducing electrode shading through innovative center electrodes and high-doping interconnections. The results support the development of stable, self-powered microsensors for Internet of Things (IoT) applications.

An on-chip power source is implemented with the optimized solar cells and the proposed energy harvesting system. Measurement results demonstrate that the proposed on-chip power source can deliver an output voltage of approximately 1 V, with a maximum power conversion efficiency of 10.20% from end to end.