Simple processing of ZnO from solution: Homoepitaxial film and bulk single crystal
- Ehrentraut, Dirk
- Miyamoto, Miyuki
- Sato, Hideto
- Riegler, Jürgen
- Byrappa, K.
- Fujii, Katsushi
- Inaba, Katsuhiko
- Fukuda, Tsuguo
- Adschiri, Tadafumi
DOIAbstract
The system LiCl−ZnCl2−K2CO3 is employed to fabricate homoepitaxial (0001) ZnO films by liquid phase epitaxy (LPE). The effect of ZnO concentration in the solution on the microstructure of the film is analyzed. Transition of growth modes was observed, evolving from island growth at <2 mmol of ZnO per 1 mol of LiCl over columnar growth (free-standing columns at 2.5 ± 0.5 mmol, porous film at 3.5 ± 0.5 mmol, and fully coalesced film at 5 mmol of ZnO) to step-flow growth at 12 ± 0.5 mmol of ZnO. Single-crystalline films, X-ray full-width half-maximum (FWHM) of 25 arcsec for (0002) reflection, with steps propagating over macroscopic dimensions were fabricated in the concentration range 12.5−14 mmol of ZnO. A structural quality factor (SQF) was i...
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