研究目的
Investigating the phonon density of states and carrier thermalisation process in nonstoichiometric titanium hydride (TiHx) for potential application as an absorber in hot carrier solar cells (HCSCs).
研究成果
The study confirmed that nonstoichiometric titanium hydride (TiH1.65) has a large phononic band gap capable of suppressing the Klemens decay, indicating its potential as an absorber in HCSCs. The carrier cooling times observed were longer than those in typical semiconductors, suggesting slow carrier thermalisation in TiHx.
研究不足
The TA results were noisy due to low absorption of the pump and low transmission of the probe in the TiHx thin film. The reliability of the fitted parameters for carrier decay times is questionable due to the strong noise in the TA data.
1：Experimental Design and Method Selection:
The study involved inelastic neutron scattering (INS) to measure the phonon density of states and ultrafast transient absorption (TA) to study the carrier thermalisation process.
2：Sample Selection and Data Sources:
A bulk polycrystalline TiH
3：65 sample and a thin film TiHx sample were prepared. The bulk sample was used for INS, and the thin film was used for TA measurements. List of Experimental Equipment and Materials:
PANalytical Empyrean XRD system for XRD measurements, PELICAN time-of-flight spectrometer for INS, and a Perkin Elmer UV/vis/IR spectrophotometer for TA measurements.
4：Experimental Procedures and Operational Workflow:
The bulk sample was hydrogenated and characterized using XRD. INS measurements were conducted to obtain the phonon density of states. The thin film was fabricated, hydrogenated, and characterized using XRD and TA to study the carrier thermalisation process.
5：Data Analysis Methods:
The phonon density of states was calculated from INS data. TA data were analyzed to estimate carrier cooling times.
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