研究目的
Investigating the effect of substrate temperature on the diffusion of alkali ions through molybdenum thin films in CIGS solar cells.
研究成果
Substrate temperature is a parameter that can be used to manipulate the diffusion of alkali ions through the molybdenum thin films by controlling crystallinity. Using XRD, dynamic SIMS profiles and modeling via COMSOL, it is possible to find geometries that will model accurately alkali ion diffusion through molybdenum thin films at various substrate temperature.
研究不足
The model and understanding should allow for simulation and modeling of alkali diffusion (and potentially other impurities) through the CIGS layer during various growth processes, but further validation is needed.
1：Experimental Design and Method Selection:
Molybdenum thin films were prepared using dc magnetron sputtering on SLG substrates for 90 min. The deposition parameters for power and pressure were 150 W and 10 mTorr, respectively. Five different substrate temperatures, and a control sample at room temperature (RT), were prepared.
2：Sample Selection and Data Sources:
The temperatures used were RT, 50, 100, 150, 200, and 250 °C. XRD was used to determine an approximate grain size using Scherrer’s equation. SEM was used to determine the film thicknesses. Dynamic SIMS was used to generate impurity profiles of sodium, oxygen, and potassium through the thin films.
3：List of Experimental Equipment and Materials:
dc magnetron sputtering system, X-ray diffraction (XRD), scanning electron microscopy (SEM), and secondary ion mass spectrometry (SIMS).
4：Experimental Procedures and Operational Workflow:
Films were prepared with varying deposition parameters, and material characterizations were performed.
5：Data Analysis Methods:
The diffusion phenomena were modeled using COMSOL multiphysics to solve the time dependent Fick’s Law.
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