Stabilizer-free CdSe/CdS core/shell particles from one-step solution precipitation and their application in hybrid solar cells

C. Selene Coria-Monroy, Claudia Martínez-Alonso, M. Sotelo-Lerma, José Manuel Hernández, Hailin Hu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


CdSe/CdS core/shell nanoparticles were synthesized in aqueous solution by one-step process. CdSe precipitates were first obtained at 80 °C in a solution of cadmium chloride, sodium citrate, ammonia and sodium selenosulfate. After 4 h of reaction, the solution with CdSe products was cooled to 60 °C and thiourea (TU), a sulfur precursor, was added while stirring. The amount of the TU solution added was 2, 5 and 10 mL, and the obtained products were named as CdSe/CdS-2, CdSe/CdS-5 and CdSe/CdS-10, respectively. It is observed that CdSe core particles had predominantly a crystalline cubic structure, and the addition of TU in the CdSe solution led to the formation of a very low concentration of hexagonal crystalline phase of CdS whose intensity increased with the amount of TU. The energy-dispersive X-ray spectroscopy in a scanning electron microscope indicated an increase of sulfur concentration in CdSe/CdS products as a function of the amount of TU solution. The presence of CdS-like morphology on the surface of CdSe/CdS particles was also evident. Photoluminescence emission spectra of the CdSe/CdS particles exhibited an increasing CdS emission as the volume of TU solution increased. The photovoltaic performance of solar cells based on CdSe/CdS particles and poly(3-hexylthiophene) (P3HT) suggested that the CdSe particles should be surrounded by CdS because of the similarity between the current–voltage curves of CdSe/CdS/P3HT heterojunctions and that of CdS/P3HT solar cells.

Original languageEnglish
Pages (from-to)5532-5538
Number of pages7
JournalJournal of Materials Science: Materials in Electronics
Issue number8
StatePublished - 23 Aug 2015

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© 2014, Springer Science+Business Media New York.


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