We present a comprehensive study on the optical properties of gold-doped rhenium disulphide (ReS2:Au) layer crystal. Its anisotropic optical properties were studied by using the polarization-dependent optical absorption and photoconductivity (PC) measurements. Absorption measurements indicate that the absorption edge shifted toward high energy as the sample was slimmed down to a thin piece. For the first time, excitonic transitions have been observed by this method. The room temperature transition energies were evaluated to be 1.48 eV for E
1
ex and 1.516 eV for E
2
ex. E
1
ex exciton dominates the transition as the polarization is parallel to the b-axis of the layer crystal, while E
2
ex exciton is most present as the polarization is perpendicular. PC spectra are performed to check this anisotropic phenomenon. Thermoreflectance modulation (TR) and photoluminescence (PL) measurements have been performed in the temperature range of 42 to 300 K. The temperature dependence of the transition energies and broadening parameters were determined.
The optoelectric properties of GaInP p-i-n solar cells with different intrinsic layer (i-layer) thicknesses from 0.25 to 1 μm were studied. Both emission intensity and full width at half maximum features of the photoluminescence spectrum indicate that the optimum i-layer thickness would be between 0.5 and 0.75 μm. The integrated current results of photocurrent experiment also point out that the samples with 0.5 to 0.75 μm i-layer thicknesses have optimum value around 156 nA. Electroreflectance measurements reveal that the built-in electric field strength of the sample gradually deviates from the theoretical value larger when i-layer thickness of the sample is thicker than 0.75 μm.I-Vmeasurements also confirm crystal quality for whole samples by obtaining the information about short currents of photovoltaic performances. A series of experiments reflect that thicker i-layer structure would induce more defects generation lowering crystal quality.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.