期刊
NANO LETTERS
卷 10, 期 1, 页码 318-323出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl903623n
关键词
Charge transfer; nanocrystal; molecule; dielectric constant; reorganization energy; solvent
类别
资金
- Cornell Center for Materials Research (CCMR)
- National Science Foundation [DMR 0520404, EEC-0646547]
Transfer of photoexcited charge from PbS nanocrystals to ligand molecules is investigated in different solvents. We find that the charge transfer rate increases dramatically with solvent. dielectric constant. This trend is accounted for by a modified Marcus theory that incorporates only static dielectric effects, The choice of solvent allows significant control of the charge transfer process. As art important example, we Find that PbS nanocrystals dispersed in Water exhibit charge transfer rates 1000 times higher than the same nanocrystals in organic solvent. Rapid charge extraction will be important to efficient nanocrystal-based photovoltaic and photodetector devices.
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