The best replacement for solar cell is solar panel.

The best alternatives to solar cell are rated as following:
★★★★★  solar panel
★★★  photovoltaic cell
★★  solar module
★★  photodiode
★★  plant cell
★★  photosynthesis
  solar collector

Your alternative for solar cell is not listed? Suggest!
Speaking about solar cell, one probably shouldn't forget about fresnel lens.

Other search terms related to solar cell and their ratings are:
★★★★★ fresnel lens
You have in mind a companion for solar cell and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of solar cell in all years. Click on graph for more.
solar cell
solar panel
photovoltaic cell