Fine Tuning of Colloidal CdSe Quantum Dot Photovoltaic Properties by Microfluidic Reactors

Da Woon Jeong, Ji Young Park, Taek Soo Kim, Tae Yeon Seong, Jae Yup Kim, Min Jae Ko, Bum Sung Kim

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Colloidal quantum dots (QDs) are attractive materials for application in photovoltaic and photoelectrochemical 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.

Original languageEnglish
JournalElectrochimica Acta
DOIs
Publication statusAccepted/In press - 2016 Jun 9

Fingerprint

Microfluidics
Semiconductor quantum dots
Tuning
Quantum yield
Solar cells
Photosensitizing Agents
Photosensitizers
Surface states
Excitons
Band structure
Conversion efficiency
Flow rate
Electrodes
Electrons

Keywords

  • CdSe
  • Microfluidic Reactors
  • Microreactor
  • QDSC
  • Quantum Dots

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

Cite this

Fine Tuning of Colloidal CdSe Quantum Dot Photovoltaic Properties by Microfluidic Reactors. / Jeong, Da Woon; Park, Ji Young; Kim, Taek Soo; Seong, Tae Yeon; Kim, Jae Yup; Ko, Min Jae; Kim, Bum Sung.

In: Electrochimica Acta, 09.06.2016.

Research output: Contribution to journalArticle

Jeong, Da Woon ; Park, Ji Young ; Kim, Taek Soo ; Seong, Tae Yeon ; Kim, Jae Yup ; Ko, Min Jae ; Kim, Bum Sung. / Fine Tuning of Colloidal CdSe Quantum Dot Photovoltaic Properties by Microfluidic Reactors. In: Electrochimica Acta. 2016.
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