Abstract
In this paper we showed that illumination of both front and back sides of heterojunction solar cells contribute efficiency. The obtained spectral dispersion of quantum efficiency confirms that contribution depends on conversion of short-wave photonts. The average difference between quantum efficiency of both sides is ∼ 11%. Under standard solar illumination in the 400−1100 nm wavelength range the short-current density for front side is 36.3 mA/cm² and 32.7 mA/cm² for back side with reduction about 10%.
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