Scientific Achievement
Efficient transformation of photexcitation facilitated by hybrid excitons engineered from a two-dimensional layer (2D)/zero-dimension (0D) quantum dot nanostructure.
Significance and Impact
The hybrid excitons are several times more weakly bound than in parent 2D materials, enabling dissociation that can improve the conversion efficiency of light into electricity
Research Details
– A hybrid nanostructure composed of a monolayer of WS2 covered with a monolayer of CdSe-ZnS quantum dots
– Photoluminescence and micro-absorption spectroscopies characterized the hybrid nanoscale system and its individual building block.
– Femtosecond pump-probe spectroscopy revealed ultrafast formation (~45 fs) of weakly-bound excitons following electron transfer from WS2 monolayer to the quantum dots.
A. Boulesbaa, K. Wang, M. Mahjouri-Samani, M. Tian, A. A. Puretzky, I. Ivanov, C. M. Rouleau, K. Xiao, B. G. Sumpter, D. B. Geohegan, J. Am. Chem. Soc. 138, 14713 (2016).
