Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 118, Issue 1, Pages 214-222Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp410599q
Keywords
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Funding
- National Basic Research Program of China [2011CBA00700]
- National High Technology Research and Development Program of China [2011AA050527]
- Chinese Academy of Sciences [GJHZ1220]
- Program of Hefei Center for Physical Science and Technology [2012FXZY006]
- National Natural Science Foundation of China [21173228, 61204075]
- CREST program of the Japan Science and Technology Agency (JST)
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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 TiO2 nanocrystalline electrodes and followed by a post-treatment of the sensitized photoanode films with sulfur ions (S2-) 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(2)), 65% higher than that of the organic ligands capped QDSSCs.
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