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 language | English |
|---|---|
| Journal | Electrochimica Acta |
| DOIs | |
| Publication status | Accepted/In press - 2016 Jun 9 |
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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 journal › Article
}
TY - JOUR
T1 - Fine Tuning of Colloidal CdSe Quantum Dot Photovoltaic Properties by Microfluidic Reactors
AU - Jeong, Da Woon
AU - Park, Ji Young
AU - Kim, Taek Soo
AU - Seong, Tae Yeon
AU - Kim, Jae Yup
AU - Ko, Min Jae
AU - Kim, Bum Sung
PY - 2016/6/9
Y1 - 2016/6/9
N2 - 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.
AB - 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.
KW - CdSe
KW - Microfluidic Reactors
KW - Microreactor
KW - QDSC
KW - Quantum Dots
UR - http://www.scopus.com/inward/record.url?scp=85007295204&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85007295204&partnerID=8YFLogxK
U2 - 10.1016/j.electacta.2016.11.157
DO - 10.1016/j.electacta.2016.11.157
M3 - Article
AN - SCOPUS:85007295204
JO - Electrochimica Acta
JF - Electrochimica Acta
SN - 0013-4686
ER -