Special Series on Perovskite-Based Solar Cells

Understanding perovskite formation through the intramolecular exchange method in ambient conditions

[+] Author Affiliations
Rodrigo Szostak, Adriano S. Marques, Ana F. Nogueira

University of Campinas (UNICAMP), Laboratório de Nanotecnologia e Energia Solar, Chemistry Institute, Campinas, São Paulo, Brazil

Jhon A. P. Castro

University of Campinas (UNICAMP), Laboratório de Nanotecnologia e Energia Solar, Chemistry Institute, Campinas, São Paulo, Brazil

Federal University of Rio Grande do Sul, Laboratório de Processos Eletroquímicos e Corrosão, Porto Alegre, Rio Grande do Sul, Brazil

J. Photon. Energy. 7(2), 022002 (May 24, 2017). doi:10.1117/1.JPE.7.022002
History: Received March 20, 2017; Accepted May 8, 2017
Text Size: A A A

Abstract.  Among the methods to prepare hybrid organic–inorganic perovskite films, the intramolecular exchange method was the first one that made possible to prepare perovskite solar cells with efficiencies higher than 20%. However, perovskite formation by this method is not completely understood, especially in ambient conditions. In this work, perovskite films were prepared by the intramolecular exchange method in ambient conditions. The spin coating speed and the frequency of the MAI solution dripping onto PbI2(DMSO) were varied during the deposition steps. With the combination of these two parameters, a rigid control of the solvent drying was possible. Thus, depending on the chosen conditions, the intermediate (MA)2Pb3I8·2DMSO was formed with residual PbI2. Otherwise, direct formation of perovskite film was attained. A mechanism for the direct formation of bulk perovskite was proposed. We also investigated how the posterior thermal annealing affects the crystallinity and defects in perovskite films. With prolonged thermal annealing, the excess of MAI can be avoided, increasing the efficiency and decreasing the hysteresis of the solar cells. The best perovskite solar cell achieved a stabilized power output of 12.9%. The findings of this work pave the way for realizing the fabrication of efficient perovskite solar cells in ambient atmosphere, a very desirable condition for cost-efficient large scale manufacturing of this technology.

Figures in this Article
© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Rodrigo Szostak ; Jhon A. P. Castro ; Adriano S. Marques and Ana F. Nogueira
"Understanding perovskite formation through the intramolecular exchange method in ambient conditions", J. Photon. Energy. 7(2), 022002 (May 24, 2017). ; http://dx.doi.org/10.1117/1.JPE.7.022002


Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

PubMed Articles
Advertisement
  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.