OPEN ACCESS

Articles online

Additive Effects on Chemical Vapor Deposition of CdS

Category: Articles

Volume: 4 | Issue: 1 | Pages: 17-26
DOI: 10.4209/aaqr.2004.07.0002
PDF | RIS | BibTeX

Yung-Jung Hsu, Shin-Yuan Lu

  • Department of Chemical Engineering, National Tsing-Hua University, Hsin-Chu, Taiwan

Abstract

An additive, silver nitrate (AgNO3), was used to prepare nanostructured films of cadmium sulfide (CdS) via a metallorganic chemical vapor deposition (MOCVD) process by using a single source precursor of CdS. The silver (Ag) vapors or clusters resulting from the thermal decomposition of the additive served as the extra active sites for nucleation of both surface and gas-phase growth of CdS and had an apparent influence on the morphology and photoluminescent (PL) property of the resulting CdS deposits. When the additive was present, a reduction in characteristic size of the CdS deposit structure was observed. In the first half of the reactor, an apparent morphology change and a significant increase in the deposition rate of CdS deposits were observed, attributable to the increased nucleation rate. In the second half of the reactor, both deposit morphology and eposition rate did not change much, possibly due to the depletion of Ag vapors or clusters. The PL quantum yield of the deposit was much enhanced in the additive case. In addition, the gas-phase formed particles became more numerous and much finer in size due to the increased nucleation rate. The nanoparticles collected at the reactor exit were smaller than 5 nm, giving rise to a substantial blue-shift in ultraviolet/visible (UV/Vis) absorption (from 500 to 375 nm) and corresponding photoluminescence (from 520 to 430 nm) spectra because of the strong quantum confinement effect.

Keywords

Additive effect Chemical vapor deposition CdS Single-source precursor


Related Article

Critical Emissions from the Largest On-Road Transport Network in South Asia

Saroj Kumar Sahu , Gufran Beig, Neha Parkhi
Volume: 14 | Issue: 1 | Pages: 135-144
DOI: 10.4209/aaqr.2013.04.0137
PDF

Ambient Air Quality during Diwali Festival over Kolkata – A Mega-City in India

A. Chatterjee , C. Sarkar, A. Adak, U. Mukherjee, S.K. Ghosh, S. Raha
Volume: 13 | Issue: 3 | Pages: 1133-1144
DOI: 10.4209/aaqr.2012.03.0062
PDF

Exploring the Variation between EC and BC in a Variety of Locations

Gbenga Oladoyin Salako, Philip K. Hopke , David D. Cohen, Bilkis A. Begum, Swapan K. Biswas, Gauri Girish Pandit, Yong-Sam Chung, Shamsiah Abd Rahman, Mohd Suhaimi Hamzah, Perry Davy, Andreas Markwitz, Dagva Shagjjamba, Sereeter Lodoysamba, Wanna Wimolwattanapun, Supamatthree Bunprapob
Volume: 12 | Issue: 1 | Pages: 1-7
DOI: 10.4209/aaqr.2011.09.0150
PDF
;