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(Color online) Architecture of Cu(In,Ga)Se2 microcells. (a) SEM cross-section of a microcell. (b) Scheme of the structure, not to scale. The red rectangle corresponds to the part that is observed in SEM.
(Color online) Characteristics of a 15 μm diameter microcell. Efficiency vs short circuit current density, or laser power density (λ = 532 nm). The dots are experimental data; the line is a guide for the eyes. The inset shows Voc vs Jsc.
(Color online) Series resistance of a 15 μm microcell that is determined by fitting the current-voltage characteristics, as a function of the incident power density or short circuit current density. The dots correspond to experimental data; the line is the fit according to Eq. (1).
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