The best replacement for photovoltaic is solar thermal.

The best alternatives to photovoltaic are rated as following:
★★★★★  solar thermal
★★★★★  solar
★★★★  solar panels
★★★  photoconductive
★★★  solar cells
★★  photoelectric
★★  monocrystalline
★★  csp
★  thermal
★  pv
★  concentrated solar power
★  solar water heater
  solar hot water
  solar thermal energy
  stirling engine
  solar water heating
  solar collectors

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Google Trends

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