Has there been any real breakthroughs in solar cell technology in the past years as far as electrical output per millimeter?

1 hour ago, Ring0kp said:

Has there been any real breakthroughs in solar cell technology in the past years as far as electrical output per millimeter?

Per millimetre? Millimetre of what? 

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A unique architectural structure enabled the researchers to record a certified stabilized efficiency of 24% under 1-sun illumination, making it the highest reported of its kind. The highly efficient cell also retained 87% of its original efficiency after 2,400 hours of operation at 55 degrees Celsius

Solar energy breakthrough: Perovskite cell with greater stability, efficiency

 

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Researchers have created a device that is capable of turning infrared heat into electricity through the use of a power-generation device called a ‘thermo-radiative diode’.

Following a significant advancement in thermal capture technology, the sun’s immense energy may soon be captured even in the dead of night.