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Photoconduction in porous TiO2 sensitized by PbS quantum dots
Abstract
Photoconduction in heterogeneous thin films consisting of a porous nanocrystalline TiO2 matrix and internally adsorbed quantum size PbS clusters is reported. The TiO2 serves to establish electrical contact to the PbS clusters, and the PbS cluster size is chosen so that photogenerated excess electrons are directly injected from the PbS to the TiO2. The films exhibit strong photoconductance in the visible region, indicating photoelectric sensitization of the TiO2 by the PbS clusters. Comparison of the absorption and photocurrent spectra shows that only PbS clusters of sizes smaller than ∼25 Å contribute to the sensitization. For larger clusters the band alignment at the TiO2/PbS interface appears to be unfavorable for carrier transfer. Further improvement in the photoresponse will have to involve optimization of the transport properties in the nanocrystalline TiO2.
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Cited by
Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic Cells
Kojima, A., Teshima, K., Shirai, Y., & Miyasaka, T. (2009) · Journal of the American Chemical Society · doi:10.1021/ja809598r · Cited by 23,090
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
Jun, H. K., Careem, M. A., & Arof, A. K. (2013) · Renewable and Sustainable Energy Reviews · doi:10.1016/j.rser.2013.01.030 · Cited by 373
Lu, Z.-X., Zhang, Z.-L., Zhang, M.-X., Xie, H.-Y., Tian, Z.-Q., Chen, P., Huang, H., & Pang, D.-W. (2005) · The Journal of Physical Chemistry B · doi:10.1021/jp054472h · Cited by 29
Metadata
- Authors
- Hoyer, P., & Könenkamp, R.
- Venue
- Applied Physics Letters
- Publisher
- AIP Publishing
- Published
- 1995-01-16
- Volume
- 66
- Issue
- 3
- Pages
- 349-351
- ISSN
- 0003-6951 (ISSN-L)
- 1077-3118
- OpenAlex
- W2059482593
- Cited by
- 226
- References
- 0
- FWCI
- 5.33
- Type
- journal article
- Language
- en
- Open access
- closed
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- Hoyer, P., & Könenkamp, R. (1995). Photoconduction in porous TiO2 sensitized by PbS quantum dots. Applied Physics Letters. https://doi.org/10.1063/1.114209
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