====== PV efficiency ======
The efficiency of a [[photovoltaic_more|photovoltaic panel]] is defined as follows:

$\eta = \frac{E^-}{I+}$
^$\eta$ |Efficiency [%] |
^$E^-$ |Electricity produced by the PV panel [W/m<sup>2</sup>] |
^$I^+$ |Solar irradiance [W/m<sup>2</sup>] |

Next table contains the expected evolution of PV panels efficiency classified by technology.

^Technology/Efficiency <sup>[[#References|[1]]]</sup> ^2012 ^2020 ^2035-2050 ^
|**Monocristallin silicon** |14-20% |23% |25% |
|**Polycristalin silicon** |13-15% |19% |21% |
|**Amorphous silicon** |6-9% |12% |15 % |


===== References =====

[1] [[http://www.strom.ch/uploads/media/AES_DCB_04_Electricite-photovoltaique-solaire-thermique_03-2013.pdf|VSE (2012), Electricité photovoltaïque et solaire thermique.]]