Ammonia-free chemically deposited CdS films as active layers in thin film transistors

G. Arreola-Jardón, L. A. González, L. A. García-Cerda, B. Gnade, M. A. Quevedo-López, R. Ramírez-Bon*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

In this work we have grown CdS thin films using an ammonia-free chemical bath deposition process for the active layer in thin film transistors. The CdS films were deposited substituting sodium citrate for ammonia as the complexing agent. The electrical characterization of the as-deposited CdS-based thin film transistors shows that the field effect mobility and threshold voltage were in the range of 0.12-0.16 cm2V-1 s-1 and 8.8-25 V, respectively, depending on the channel length. The device performance was improved considerably after thermal annealing in forming gas at 250 °C for 1 h. The mobility of the annealed devices increased to 4.8-8.8 cm 2V-1 s-1 and the threshold voltage decreased to 8.4-12 V. Ion/Ioff for the annealed devices was approximately 105-106.

Original languageEnglish
Pages (from-to)517-520
Number of pages4
JournalThin Solid Films
Volume519
Issue number1
DOIs
StatePublished - 29 Oct 2010

Bibliographical note

Funding Information:
This work was supported by CONACYT through the Becas Mixtas and Sabbatical Programs. The technical assistance of C.A. Avila-Herrera is also acknowledged.

Keywords

  • Cadmium sulfide
  • Chemical bath deposition
  • Electrical properties and measurements
  • Field effect transistors

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