Ex Situ
CdSe Quantum Dot-Sensitized Solar Cells Employing
Inorganic Ligand Exchange To Boost Efficiency
Feng Liu
Jun Zhu
Junfeng Wei
Yi Li
Linhua Hu
Yang Huang
Oshima Takuya
Qing Shen
Taro Toyoda
Bing Zhang
Jianxi Yao
Songyuan Dai
10.1021/jp410599q.s001
https://acs.figshare.com/articles/journal_contribution/Ex_Situ_CdSe_Quantum_Dot_Sensitized_Solar_Cells_Employing_Inorganic_Ligand_Exchange_To_Boost_Efficiency/2333803
We
present an effective way to boost the as-synthesized CdSe quantum
dot-sensitized solar cells (QDSSCs) performance by introducing an
inorganic ligand exchange strategy into this traditional system. Inorganic
ligand exchange, to the best of our knowledge, is designed for the
first time for CdSe-based QDSSCs, and it features low-cost, easy operation,
and repeatable process. The route involves the direct deposition of
the CdSe quantum dots (QDs), which were initially capped with trioctylphosphine
(TOP) ligands onto mesoporous TiO<sub>2</sub> nanocrystalline electrodes
and followed by a post-treatment of the sensitized photoanode films
with sulfur ions (S<sup>2–</sup>) solution. Here, changes in
surface chemical status of CdSe QDs during the inorganic ligand exchange
process and the influence of ligand exchange on the electron’s
ultralfast transfer between nanoparticles were investigated through
XPS and femtosecond transient grating techniques, respectively. With
the inorganic ligand passivated CdSe QDs, the QDSSCs exhibited a power
conversion efficiency of 3.17% (AM1.5G, 100 mW/cm<sup>2</sup>), 65%
higher than that of the organic ligands capped QDSSCs.
2014-01-09 00:00:00
CdSe quantum dots
surface chemical status
XPS
power conversion efficiency
CdSe QDs
Inorganic ligand exchange
grating techniques
mesoporous TiO 2 nanocrystalline electrodes
1.5G
repeatable process
sulfur ions
QDSSC
ligand exchange process
photoanode films
ligand exchange strategy
AM
Ligand Exchange
ligand passivated CdSe QDs
ligand exchange