Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 22, Pages 19135-19142Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b04292
Keywords
silicon quantum dots; scattering media; light trapping; xerogels; polymer
Funding
- JST Visegrad Group (V4) Japan Joint Research Project on Advanced Materials NaMSeN
- JSPS KAKENHI [16H03828]
- Grants-in-Aid for Scientific Research [16H03828] Funding Source: KAKEN
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We report strong enhancements of the effective absorption cross section and photoluminescence (PL) intensity of silicon quantum dots (Si QDs) with 2.8-6.8 nm in diameter in a highly scattering dielectric medium. The scattering medium is a. polymer, thin. film: with submicrometer size pores inside, supporting the resonant: cavity modes in the visible range. By the scattering associated with the cavity modes, efficient, light trapping into a polymer film with similar to 1 mu m in thickness is achieved, which leads to 30-40 times enhancement of the effective absorption cross section of embedded Si QDs, in a green,:red Wavelength range. The scattering medium Can also enhance up to 40 times the PL of QDs. Detailed analysis reveals that the enhancements of the extraction efficiency as well as the excitation efficiency Contribute to the PL enhancement.
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