Strikingly different CuCu2O photovoltaic cells are created by forming Cu on different Cu2O crystals at high temperatures in a reducing atmosphere. Measurements in air of photovoltaic effects, such as open‐circuit voltage and short‐circuit current are made on wedge‐shaped samples in the 1.6 to 1.9 eV photon energy range, to obtain values for conversion efficiency, barrier height, fill factor, and optical absorption coefficients. The results are correlated with direct measurements of optical absorption coefficients. Strong optical absorption in the gap is found to result in low conversion efficiency even when extrapolation to zero thickness of oxide layer is made.
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