Loading...
Please wait, while we are loading the content...
Similar Documents
Croissance et caractérisation des boîtes quantiques InAs/GaAs pour des applications photovoltaïques
| Content Provider | Semantic Scholar |
|---|---|
| Author | Zribi, Jihene |
| Copyright Year | 2014 |
| Abstract | This paper reports on an in-situ growth process used to optimize InAs/GaAs quantum dot (QD) multilayer structures grown on (001) GaAs substrate by chemical beam epitaxy (CBE). Defects related to the incoherently relaxed InAs clusters are found to alter the QD nucleation mechanism on the subsequent layers, leading to reduced QD density and photoluminescence intensity. The formation of poor crystalline quality clusters is avoided by growing the GaAs spacer layers in a two-step process. The technique consists in covering the InAs QD layer with a 10 nm-thick GaAs layer grown at 465oC, and then removing the excess indium contained in the uncapped portion of the clusters by increasing the temperature to 565oC for 10 min before the deposition of the remaining GaAs spacer layer. Morphological investigation shows that the QD density and size distribution obtained in the first layer are preserved up to the tenth layer. The QD integrated photoluminescence intensity is found to increase linearly with the number of stacked layers. These results are very promising for chemical beam growth of high performance intermediate-band solar cells. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://savoirs.usherbrooke.ca/bitstream/handle/11143/5927/Zribi_Jihene_PhD_2014.pdf?isAllowed=y&sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
