Perovskite based hydrogen detection and electrical properties of n-Si/BaTiO3 heterojunction
International Journal of Hydrogen Energy, vol.220, 2026 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 220
- Publication Date: 2026
- Doi Number: 10.1016/j.ijhydene.2026.154148
- Journal Name: International Journal of Hydrogen Energy
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Artic & Antarctic Regions, Chemical Abstracts Core, Chimica, Compendex, Environment Index, INSPEC
- Keywords: BaTiO3, Electrical characterization, Heterojunction, Hydrogen sensor, Perovskite
- Ataturk University Affiliated: No
Abstract
In this study, the electrical characterization of a heterojunction structure produced by coating powdered BaTiO3 from the perovskite family onto n-type silicon using the drop casting method was investigated at room temperature and as a function of temperature in a hydrogen atmosphere. The structural and optical characterization were evaluated using XRD analysis of the BaTiO3 powder, SEM – TEM images of the thin film structure, EDX spectrum, and UV analysis. The temperature-dependent current-voltage and alternating current changes of the n-Si/BaTiO3 heterojunction were measured in a dry air atmosphere. According to the measurement results, the n-Si/BaTiO3/Pt heterojunction device exhibited Schottky behavior. Furthermore, the sensor response of the heterojunction to hydrogen gas was calculated as 6.73. The hydrogen sensor response, measured at 50 °C at concentrations ranging from 500 ppm to 3%, increased in a concentration-dependent manner. Hydrogen detection measured at 100 °C shows a very good repeatability and stability at 20-min intervals in a 1% hydrogen atmosphere. The sensor response of n-Si/BaTiO3 heterojunction is about 3.71 ± 4% in average for 70 days exposure to 1% hydrogen at 100 °C. Hydrogen gas tests were measured as a function of temperature and concentration changes. The obtained results are promising for the evaluation of the n-Si/BaTiO3 heterojunction as a hydrogen gas sensor.