Issue 9, 2020

Electron transfer in a semiconductor heterostructure interface through electrophoretic deposition and a linker-assisted method

Abstract

Modulating the heterostructured interface of semiconductor nanocrystals is being widely explored to enhance the charge transfer rate in photoelectrochemical cells. Here we use electrophoretic deposition and a linker-assisted method to fabricate heterostructured photoanodes based on CdSe quantum dots (QDs) or CdSe(S) nanoplates (NPLs)/TiO2 nanoparticles. The semiconductor nanocrystals exhibit red-shifted or dual photoluminescence emissions after electrophoretic deposition, due to the formation of surface traps. The calculated electron transfer rates in CdSe QDs/TiO2 nanoparticle photoanodes fabricated via electrophoretic deposition and 3-mercaptopropionic acid (MPA)-assisted attachment are 5.5 × 107 s−1 and 2.7 × 107 s−1, respectively, which are both higher than those obtained from NPLs/TiO2 nanoparticles ranging from 0.7 × 107 s−1 to 1.3 × 107 s−1. As a proof of concept, we used heterostructured semiconductor nanocrystals/TiO2 nanoparticles as photoanodes for solar-driven hydrogen generation. Upon one sun illumination, the saturated photocurrent densities of photoanodes fabricated via electrophoretic deposition were found to be higher than those of photoanodes prepared via MPA-assisted attachment, while the corresponding photoanode shows inferior long-term photostability due to the formation of surface traps on the QDs or NPLs during the electrophoretic deposition process. These results provide useful information for engineering the surface/dimension/composition of semiconductor nanocrystals, their adsorption on porous TiO2 films, and designing high-efficiency photoelectrodes in photoelectrochemical devices.

Graphical abstract: Electron transfer in a semiconductor heterostructure interface through electrophoretic deposition and a linker-assisted method

Supplementary files

Article information

Article type
Paper
Submitted
31 Okt 2019
Accepted
22 Jan 2020
First published
22 Jan 2020

CrystEngComm, 2020,22, 1664-1673

Electron transfer in a semiconductor heterostructure interface through electrophoretic deposition and a linker-assisted method

Y. Zhou, X. Tong, D. Benetti, Z. M. Wang, D. Ma, H. Zhao and F. Rosei, CrystEngComm, 2020, 22, 1664 DOI: 10.1039/C9CE01729A

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