University of Twente Student Theses
Towards CuAlS2 and CuAlO2 p-type Transparent Conductors
Glenza, Jane (2023) Towards CuAlS2 and CuAlO2 p-type Transparent Conductors.
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| Abstract: | This study aimed to develop a new synthesis approach for CuAlO2 and CuAlS2 films by transforming metallic copper aluminum films into p-type transparent semiconductor films through controlled annealing in oxygen and sulfur atmospheres, respectively. The structural, optical, electrical, and morphological properties of the films were investigated, focusing on the effects of annealing temperature, time, and film thickness. The method consisted of depositing CuAl films with a CuAl ratio of 1.4:1 on a glass substrate using DC sputtering with varying film thicknesses (5 nm, 30 nm, and 100 nm). The films were then subjected to thermal treatment in a tube oven. The results show that annealing the films in an oxygen atmosphere resulted in the formation of CuAl/CuAlOx dual-phase films due to surface oxidation, while annealing in a sulfur atmosphere led to CuAl/CuAlSx mixed-phase films due to surface sulphurization. The electrical properties and transmittance of the 5 nm films changed significantly after annealing compared to the 30-nm and 100-nm thick films. The most promising films were the 5 nm film annealed in an oxygen atmosphere at 400°C for 12 hours and the 5 nm film annealed in a sulfur atmosphere at 500°C for 5 hours. These films exhibited improved electrical properties, such as decreased resistivity and increased mobility, as well as increased transmittance and band gap values compared to the as deposited films. Although the annealed films exhibited n-type conductivity, achieving ultra-thin films with these properties holds significant importance as novel transparent electrodes for semiconductor devices Further annealing was conducted on CuAl films deposited on MgO substrates at 600°C for 12 hours, successfully yielded a p-type semi-transparent film. In conclusion, the new synthesis approach successfully transformed metallic copper aluminum films into p-type transparent semiconductor films. |
| Item Type: | Essay (Bachelor) |
| Faculty: | TNW: Science and Technology |
| Subject: | 35 chemistry |
| Programme: | Chemical Engineering BSc (56960) |
| Link to this item: | https://purl.utwente.nl/essays/106346 |
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