Sains Malaysiana 38(2): 215-218(2009)

 

Physical Properties of Cuprous Oxide Thin Films Grown on n-Si

Substrate by Sol-Gel Spin Coating

(Sifat Fizikal Filem Nipis Kuprus Oksida Yang Di Mendapkan Di atas

Substrat N-Si Melalui Kaedah Salutan Berputar Sol-Gel)

 

D.S. CHE HALIN, I.A. TALIB, A.R. DAUD & M.A.A. HAMID

School of Applied Physics, Universiti Kebangsaan Malaysia

43600 Bangi, Selangor, Malaysia

 

 

Received:  12 June 2008 / Accepted: 30 June 2008

 

 

ABSTRACT

 

Cu2O films were grown on n-Si substrates via the sol-gel spin-coating method. The films were annealed under 5% H2 + 95% N2 atmosphere at 350°C, 450°C and 550°C.  Diffractogram obtained by the grazing angle x-ray diffractometry showed that the crystallinity of the films increased with increasing annealing temperature. Scanning electron microscopy micrographs revealed that the Cu2O films contain grains of irregular size indicating that the film growth followed the Volmer-Weber growth mode. The micrographs showed the size evolved from irregular shapes with average size of 100 nm at 350°C into rectangular shapes with average size of 200 nm at 550°C. Optical reflectance for 450°C and 550°C film increased gradually at wavelength 480 nm. Higher reflectance for the 450 °C film might be due to better coverage of the film. It also showed that optical absorption occured at wavelength below 480 nm.

 

Keywords: crystallinity; cuprous oxide; sol-gel; Volmer-Weber growth

 

 

ABSTRAK

 

Filem Cu2O dienapkan ke atas n-Si menggunakan kaedah sol-gel salutan berputar. Filem disepuh lindap di dalam atmosfera 5% H2 + 95% N2 pada suhu 350°C, 450°C dan 550 °C. Belauan sinar-X penujuan gesel menunjukkan kristaliniti yang meningkat dengan peningkatan suhu sepuh lindap. Mikrograf mikroskopi elektron imbasan memaparkan filem Cu2O mengandungi saiz butiran yang tidak sekata yang menunjukkan pertumbuhan filem berdasarkan model pertumbuhan Volmer-Weber. Mikrograf menunjukkan pertumbuhan saiz dan butiran daripada butiran yang tidak sekata dengan purata saiz 100 nm pada suhu 350°C kepada butiran berbentuk segiempat dengan purata saiz 200 nm pada suhu 550 °C. Pantulan optik bagi filem yang disepuh lindap pada suhu 450°C dan 550°C meningkat secara beransur-ansur pada jarak gelombang 480 nm. Filem pada suhu sepuh lindap 450°C mempunyai peratus pantulan yang lebih tinggi mungkin disebabkan oleh liputan filem yang baik.  Ini menunjukkan penyerapan berlaku di bawah jarak gelombang 480 nm.

 

Kata kunci: Kristaliniti; kuprus oksida; pertumbuhan Volmer-Weber; sol-gel  

 

 

REFERENCES

 

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