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

Henna extract concentration 𝑉 o c (V) 𝐼 s c (mA)FF % 𝜂 %

Bahraini 80.0 g0.4260.36824.60.128
Bahraini 8.0 g0.4100.90636.30.450
Bahraini 0.8 g0.4190.62033.00.286
Yemeni 84.0 g0.3060.40728.10.117
Yemeni 21.0 g0.3260.43037.10.174
Yemeni 4.2 g0.5000.41427.60.191