Dual-functional CuO:Fe<sub>2</sub>O<sub>3</sub>/n-Si heterojunction with applications in gas sensors and self-powered visible photodetectors

Sarıtaş S., Yıldırım F., Orhan Z., Aydoğan Ş.

OPTICAL MATERIALS, cilt.151, 2024 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 151
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1016/j.optmat.2024.115315
  • Dergi Adı: OPTICAL MATERIALS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Applied Science & Technology Source, Chimica, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC
  • Anahtar Kelimeler: CuO:Fe2O3, Detectivity, Gas sensing, Photodetection
  • Atatürk Üniversitesi Adresli: Evet

Özet

CuO and Fe2O3 nanofilms were successively coated on n-Si substrate at 450 degree celsius by DC sputtering method and then annealed to obtain Au/CuO:Fe2O3/n-Si/Al heterojunction. SEM, AFM, absorption and XRD analyses of CuO:Fe2O3 film was carried out. The fabricated Au/CuO:Fe2O3/n-Si/Al heterojunction device exhibited good rectification properties. Gas sensing of the device was also performed. The response of Au/CuO:Fe2O3/n-Si/Al device to hydrogen gas was investigated for gas sensor application. It is seen that the recovery time of CuO:Fe2O3 is shortened, and it also exhibits the highest response to a relative gas concentration of 1000 ppm. It is seen that the surface is sensitive to oxygen, and the substrate has a positive impact on the structure. Therefore, it can be developed as a suitable material for gas sensors. Furthermore, current-voltage measurements of the heterojunction device were performed under different visible light intensities from 100 mW/cm(2) to 250 mW/cm(2) as well as ambient light. The photocurrent increased with increasing light intensity, which was interpreted as an increase in photogenerated carrier density by absorbing more photons at higher intensities. The maximum values of on/off ratio, R and D* were determined as 2.8 x 10(4) (V = 0.0 V), 1.21 A/W (for V = -1.0 V) and 2.71 x 10(12) Jones for 100 mW light power (at V = 0.0 V), respectively.