Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 2, Issue 5, Pages 1343-1348Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am900917n
Keywords
CdS-sensitized solar cells; junction structure; post-treatment
Funding
- National Research Foundation of Korea
- Ministry of Education, Science and Technology, Republic of Korea
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Nanocrystalline CdS-sensitized solar cells (CdS-SSCs) based on mesoporous TiO2 were fabricated by the spray pyrolysis deposition method. The energy conversion efficiency of these cells was drastically increased (156%) by modifying the junction structure through post-treatment that included soaking in a dilute TiCl4 aqueous solution and subsequent thermal annealing. We propose that the post-treatment is responsible for an increased number of interconnections between TiO2 and CdS, as well as surface passivation of the CdS sensitizer. The increase in the cell efficiency is attributed to the improved charge carrier transport, suppression of photoelectron recombination with holes both in the same sensitizer particle and in nearby ones, and suppression of photoelectron capture by the electrolyte.
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