Table 1: Measured and calculated parameters of assembled Bahraini and Yemeni Henna solar cells.

Henna extract concentration (V) (mA) FF % Bahraini 80.0 g 0.426 0.368 24.6 0.128 Bahraini 8.0 g 0.410 0.906 36.3 0.450 Bahraini 0.8 g 0.419 0.620 33.0 0.286 Yemeni 84.0 g 0.306 0.407 28.1 0.117 Yemeni 21.0 g 0.326 0.430 37.1 0.174 Yemeni 4.2 g 0.500 0.414 27.6 0.191