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High Efficiency Carrier Multiplication in PbSe Nanocrystals: Implications for Solar Energy Conversion
Open accessAbstract
We demonstrate for the first time that impact ionization (II) (the inverse of Auger recombination) occurs with very high efficiency in semiconductor nanocrystals (NCs). Interband optical excitation of PbSe NCs at low pump intensities, for which less than one exciton is initially generated per NC on average, results in the formation of two or more excitons (carrier multiplication) when pump photon energies are more than 3 times the NC band gap energy. The generation of multiexcitons from a single photon absorption event is observed to take place on an ultrafast (picosecond) time scale and occurs with up to 100% efficiency depending upon the excess energy of the absorbed photon. Efficient II in NCs can be used to considerably increase the power conversion efficiency of NC-based solar cells.
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Citations
Cites
Tunable Near-Infrared Optical Gain and Amplified Spontaneous Emission Using PbSe Nanocrystals
Schaller, R. D., Petruska, M. A., & Klimov, V. I. (2003) · The Journal of Physical Chemistry B · doi:10.1021/jp0311660 · Cited by 321
Self-citation
Cited by
Solar Energy Conversion by Dye-Sensitized Photovoltaic Cells
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Advanced Nanoarchitectures for Solar Photocatalytic Applications
Kubacka, A., Fernández-García, M., & Colón, G. (2012) · Chemical Reviews · doi:10.1021/cr100454n · Cited by 2,373
Kongkanand, A., Tvrdy, K., Takechi, K., Kuno, M., & Kamat, P. V. (2008) · Journal of the American Chemical Society · doi:10.1021/ja0782706 · Cited by 1,644
Highly Efficient Quantum‐Dot‐Sensitized Solar Cell Based on Co‐Sensitization of CdS/CdSe
Lee, Y., & Lo, Y. (2009) · Advanced Functional Materials · doi:10.1002/adfm.200800940 · Cited by 1,084
Theoretical Studies of Photoinduced Electron Transfer in Dye-Sensitized TiO2
Duncan, W. R., & Prezhdo, O. V. (2007) · Annual Review of Physical Chemistry · doi:10.1146/annurev.physchem.58.052306.144054 · Cited by 580
Metadata
- Authors
- Schaller, R. D., & Klimov, V. I.
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2004-05-05
- Volume
- 92
- Issue
- 18
- Pages
- 186601-186601
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W1497033841
- Cited by
- 1,826
- References
- 1
- FWCI
- 35.62
- Type
- journal article
- Language
- en
- Open access
- green
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- Schaller, R. D., & Klimov, V. I. (2004). High Efficiency Carrier Multiplication in PbSe Nanocrystals: Implications for Solar Energy Conversion. Physical Review Letters. https://doi.org/10.1103/physrevlett.92.186601
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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