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Proceedings Paper

Novel growth techniques for the deposition of high-quality perovskite thin films
Author(s): Annie Ng; Zhiwei Ren; Gang Li; Aleksandra B. Djurišić; Charles Surya
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Paper Abstract

We present investigations on the growth of high quality CH3NH3PbI3 (MAPI) thin films using both vapor and solution techniques. Recent work on perovskite film growth indicates critical dependencies of the film quality on the nucleation and crystallization steps requiring: i.) uniform distribution of nucleation sites; and ii.) optimal crystallization rate that facilitates the growth of a compact, continuous film with low density of pinholes. Our work shows that the hybrid chemical vapor deposition technique (HCVD) technique is well suited for the deposition of evenly distributed nucleation sites and the optimization of the crystallization rate of the film through detailed monitoring of the thermal profile of the growth process. Signficant reduction in the defect states is recorded by annealing the perovskite films in O2. The results are consistent with theoretical studies by Yin et al. 1 on O and Cl passivation of the shallow states at the grain boundary of MAPI. Their work provides the theoretical basis for our experimental observations on the passivation of shallow states by oxygen annealing. High quality films were achieved through detailed management of the carrier gas composition and the thermal profile of the nucleation and crystallization steps.

Paper Details

Date Published: 23 February 2018
PDF: 9 pages
Proc. SPIE 10533, Oxide-based Materials and Devices IX, 105331Y (23 February 2018); doi: 10.1117/12.2302468
Show Author Affiliations
Annie Ng, Hong Kong Polytechnic Univ. (Hong Kong, China)
Zhiwei Ren, Hong Kong Polytechnic Univ. (Hong Kong, China)
Gang Li, Hong Kong Polytechnic Univ. (Hong Kong, China)
Aleksandra B. Djurišić, The Univ. of Hong Kong (Hong Kong, China)
Charles Surya, Nazarbayev Univ. (Kazakhstan)

Published in SPIE Proceedings Vol. 10533:
Oxide-based Materials and Devices IX
David J. Rogers; David C. Look; Ferechteh H. Teherani, Editor(s)

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