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Exciton dissociation in quantum dots connected with photochromic molecule bridges

https://doi.org/10.1039/D1TC04451F

Yoon, Lucy U. ; Adhikari, Surya B. ; Sarabamoun, Ephraiem S. ; Bietsch, Jonathan M. ; Tsai, Esther H. ; Wang, Guijun ; Choi, Joshua J. ( November 2021 , Journal of Materials Chemistry C)

We report modulation of exciton dissociation dynamics in quantum dots (QD) connected with photochromic molecules. Our results show that switching the configuration of photochromic molecules changes the inter-QD potential barrier height which has a major impact on the charge tunnelling and exciton dissociation. The switching of the dominant exciton decay pathway between the radiative recombination and exciton dissociation results in switchable photoluminescence intensity from QDs. Implications of our findings for optical memory and optical computing applications are discussed.
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The impact of cation and anion pairing in ionic salts on surface defect passivation in cesium lead bromide nanocrystals

https://doi.org/10.1039/d0tc04257a

Yoon, Lucy U. ; Alpert, Matthew R. ; Luo, Hongxi ; Schapowal, Michael I. ; Holmgren, Eric N. ; Geise, Geoffrey M. ; Paolucci, Christopher ; Choi, Joshua J. ( January 2021 , Journal of Materials Chemistry C)
null (Ed.)
Imperfect passivation of surface charge traps on metal halide perovskite (MHP) nanocrystals remains a key obstacle to achieving higher performance in optoelectronic devices. Due to the strong ionic nature of MHPs, ionic salts have been identified as effective surface charge trap passivating ligands. In this study, based on photoluminescence quantum yield (PLQY) and time-resolved photoluminescence (TRPL) measurements on cesium lead bromide nanocrystals (CsPbBr 3 NCs), we find that the pairing between cation and anion of an ionic salt results in a significant impact on trap passivation. Using density of functional theory (DFT) calculations, we identify the binding interaction between the cation and anion of the ionic pair to be a major factor in determining the trap passviation efficacy.
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