Study of relaxation dynamics of photogenerated excitons in CuInS2 quantum dots. (24th February 2014)

• Record Type: Journal Article
• Authors: Singh, Inderpreet; Madan, S.; Kaur, A.; Kumar, J.; Bhatnagar, P.K.; Mathur, P.C.
• Is Part Of: MRS communications. Volume 4:Number 1(2014:Mar.)
• Page Start: 1
• Page End: 5
• Publication Date: 2014-02-24
• Subjects: Materials -- Periodicals; 620.11
• DOI: 10.1557/mrc.2014.5
• Languages: English
• ISSNs: 2159-6859

Abstract

Abstract: Abstract : CuInS2 (CIS) quantum dots (QDs) with different diameters were prepared and their optical properties were studied. The optical band gap of QDs, as estimated by absorption spectrum, was found to decrease with increase in size. The stokes shift between absorption and photoluminescence peaks was observed to be larger (>100 meV) in all the three samples. This shows that the defect states available in the forbidden gap dominates the recombination mechanism. The variation in the emission peak with QD size, however, indicates that the relaxation dynamics in CIS QDs involves both excitonic level as well as the defect states.