A CXXXX American Chemical Society Silicon-Based Hybrid Energy Cell for

nergy harvesting from renewable and green energy resources, such as solar,1,2 mechanical vibration,3,4 and wasted heat,5,6 has attracted increasing attention in the past decade due to the energy crisis and global warming. The silicon (Si)-based solar cell is so far the commercial technol-ogy for large scale harvesting of solar energy because of its low cost, superior perfor-mance, and industrial manufacturing.7 Photon management is an effective means for improving the efficiency of a solar cell, such as fabrication of various surface pyra-mid structures for enhancing light absorp-tion for increasing the solar efficiency.8 In practical applications, the surface of a Si solar cell is usually covered by a layer of transparent material to protect the device from corrosion, contamination, andmechan-ical damage. When a solar cell is exposed to nature, wind becomes an existing source of energy together with the working environ-ment of a solar cell, where wind energy can be easily converted to mechanical energy by using such flexible materials as energy har-vesters. An interesting question is what if the surface layer for protecting the solar cell can be used for harvesting this kind of mechan-ical energy induced by wind. Currently, nanogenerators based on the triboelectric effect have been developed to convert mechanical energy from irregular mechanical vibrations to electricity.9,10 A triboelectric nanogenerator (TENG) can be fabricated using flexible transparent poly-mermaterials. Thesematerials canbe apart for the TENG but can also be a surface protection layer for the solar cell, so that a hybrid energy cell technologymay be fabricated to simul-taneously/individually harvest multimode * Address correspondence t