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Photovoltaic properties of thin film heterojunctions with cupric oxide absorber
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Image of FIG. 1.
FIG. 1.

(a) and (b) Cross section SEM images of the sample: glass/AZO(210)/ZnO(100)/CuO(900)/NiO(20). (c) Top surface SEM image from the same sample.

Image of FIG. 2.
FIG. 2.

(a) Specular XRD from the sample: glass/AZO(210)/ZnO(100)/CuO(200)/NiO(20)/Au(50). (b) Grazing incidence surface diffraction from the same sample. The indexation of the diffraction peaks is obtained from reference patterns of polycrystalline materials (database: Powder Diffraction File 2 (PDF2) from the International Center of Diffraction Data (ICDD).

Image of FIG. 3.
FIG. 3.

1 × 1 μm2 AFM topography images from heterojunctions with x = 400 nm and x = 900 nm absorber thickness.

Image of FIG. 4.
FIG. 4.

(a) UV-VIS measurements of the transmittance, T, versus wavelength, λ, for normal light incidence. (b) Extraction of the direct bandgap of AZO, ZnO, and NiO. (c) Extraction of the CuO indirect bandgap (full black dots) and of the direct optical transition gap (full grey dots).

Image of FIG. 5.
FIG. 5.

Photoluminescence spectrum measured for a single, 200 nm-thick CuO layer on glass, with an excitation wavelength of 240 nm.

Image of FIG. 6.
FIG. 6.

Energy diagram of the investigated solar cell, assuming vacuum level alignment.

Image of FIG. 7.
FIG. 7.

Highly rectifying j-V characteristic for the sample: glass/AZO(210)/ZnO(100)/ NiO(20)/Au(400).

Image of FIG. 8.
FIG. 8.

(a) Schematic representation of the solar cell design. (b) j-V characteristics in dark and under illumination for solar cells with different CuO thickness.

Image of FIG. 9.
FIG. 9.

Transient absorption measurement with the fitting for the extraction of the carrier lifetime in a CuO layer on glass.


Generic image for table
Table I.

List of the sputtering parameters for each material, along with the corresponding deposition rate.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Photovoltaic properties of thin film heterojunctions with cupric oxide absorber