Abstract
The present paper examines the effects of surface modification of CdS with diverse dyes on fabricated CdSbased hybrid solar cells. The X-ray diffraction results showed that CdS thin films had a hexagonal phase with a preferred orientation along the (101) plane. Scanning electron microscopy indicated that the CdS specimen was composed of a granular structure while a P3HT layer was formed from tiny grains. Band gaps of the CdS thin films and the P3HT layer were 2.45 eV and 1.98 eV, respectively. The absorption spectra showed that different dye loading caused an increase in the absorbance of CdS thin films in the wavelength range of 400-650 nm. The photoluminescence of the CdS/P3HT structure including various dyes was lower than that of the pristine one, implying that efficient charge separation was achieved upon surface modification. Current density-voltage curves showed that the ITO/CdS/N719/Ag hybrid solar cell exhibited the best overall efficiency of 0.082%, which can be attributed to improvements in both short circuit current density (Jsc) and open circuit voltage (Voc) . These enhancements can be attributed to the creation of better interfacial contact between CdS and P3HT layers after dye loading.
Highlights
Organic–inorganic hybrid solar cells have gained much attention owing to their low cost and easy growth on flexible substrates compared to their inorganic-based counterparts
For the first time, we offer an interfacial modification of CdS/P3HT with four different dyes, which are organic dye (Eosin-Y), indoline dye (D205), and Ru-based complex dyes (N719 and N3)
The (101) reflection plane is predominant in the pattern, indicating a preferred orientation along this plane. It is often seen from the published reports that CdS thin films prepared by spray pyrolysis grew along the (101) plane [18]
Summary
Organic–inorganic hybrid solar cells have gained much attention owing to their low cost and easy growth on flexible substrates compared to their inorganic-based counterparts They have combined the beneficial properties of both types of material in a solar cell. The inorganic CdS semiconductor has proven to be a wonderful material in opto-electronic devices due to its direct band gap of 2.42 eV, n-type conductivity, high electron mobility, good photosensitivity, and good stability. These properties make CdS a suitable photoactive material in hybrid solar cells [2].
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