Effect of Ga/Cu Ratio on Polycrystalline CuGaSe_𝟐 Thin Film Solar Cell

Table 1

Electrical properties of various CuGaSe₂ thin films having different Ga/Cu ratio in the film. Electrical properties were determined by van der Pauw Hall measurement method at room temperature. CuGaSe₂ films were grown directly over SLG and cut into 5×5 mm² of sizes, for the measurement.

Ga/Cu	Resistivity (Ω-cm)	Carrier concentration (cm^−3)
0.89	88.5	5.8 × 10^15
0.96	16.1	2.0 × 10^16
1.05	16.3	1.5 × 10^16
1.45	34.2	6.9 × 10^15
2.04	99.4	6.0 × 10^15