Jeong, Da-Woon Park, Ji Young Kim, Taek-Soo Seong, Tae-Yeon Kim, Jae-Yup Ko, Min Jae Kim, Bum Sung 2024-01-20T02:33:29Z 2024-01-20T02:33:29Z 2021-09-05 2016-12-20 0013-4686 https://pubs.kist.re.kr/handle/201004/123307 Colloidal quantum dots (QDs) are attractive materials for application in photovoltaic and photo-electrochemical devices, due to their unique properties including band energy tunability, high absorption coefficient and multiple exciton generation. Here, we construct continuous and automated microfluidic reactors for the synthesis of CdSe QDs, and apply the synthesized QDs to the QD-sensitized solar cells (QDSCs) as a photosensitizer. The spectral range, quantum yield (QY) and surface states of QDs are facilely and finely tuned by controlling the flow rates of precursor solutions and solvents in the microfluidic reactors. The photovoltaic and photoelectrochemical performances of QDSCs are strongly affected by both the spectral range and QY of CdSe QDs. In particular, the conversion efficiency is enhanced by about 19% with the increase in QY from 15.4% to 23.2%, at the same spectral range. Furthermore, the enhanced surface purity of QDs by modified synthetic condition leads to the reduced electron recombination in the QD-sensitized TiO2 electrodes, which is confirmed by electrochemical impedance analysis. This study demonstrates the great potential of microfluidic system for the synthesis QDs and their application in photoelectrochemical solar cells. (C) 2016 Published by Elsevier Ltd. English PERGAMON-ELSEVIER SCIENCE LTD SENSITIZED SOLAR-CELLS NANOCRYSTALS CUINSE2 NANOPARTICLES COPPER CDTE MULTIPLICATION RECOMBINATION PERFORMANCE GENERATION Fine Tuning of Colloidal CdSe Quantum Dot Photovoltaic Properties by Microfluidic Reactors Article 10.1016/j.electacta.2016.11.157 1 ELECTROCHIMICA ACTA, v.222, pp.1668 - 1676 ELECTROCHIMICA ACTA 222 1668 1676 scie scopus 000395443700081 2-s2.0-85007295204 Electrochemistry Electrochemistry Article SENSITIZED SOLAR-CELLS NANOCRYSTALS CUINSE2 NANOPARTICLES COPPER CDTE MULTIPLICATION RECOMBINATION PERFORMANCE GENERATION CdSe Quantum Dots Microfluidic Reactors Microreactor QDSC