Improvement of perovskite crystallinity by omnidirectional heat transfer via radiative thermal annealing

Jiyoon Park, Jin Woo Choi, Woochul Kim, Ryeri Lee, Hee Chul Woo, Jisoo Shin, Hyeonghun Kim, Yeong Jun Son, Ji Young Jo, Heon Lee, Sooncheol Kwon, Chang Lyoul Lee, Gun Young Jung

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Abstract

As promising photo-absorbing materials for photovoltaics, organic-inorganic hybrid perovskite materials such as methylammonium lead iodide and formamidinium lead iodide, have attracted lots of attention from many researchers. Among the various factors to be considered for high power conversion efficiency (PCE) in perovskite solar cells (PSCs), increasing the grain size of perovskite is most important. However, it is difficult to obtain a highly crystalline perovskite film with large grain size by using the conventional hot-plate annealing method because heat is transferred unidirectionally from the bottom to the top. In this work, we presented radiative thermal annealing (RTA) to improve the structural and electrical properties of perovskite films. Owing to the omnidirectional heat transfer, swift and uniform nuclei formation was possible within the perovskite film. An average grain size of 500 nm was obtained, which is 5 times larger than that of the perovskite film annealed on a hot-plate. This perovskite film led to an enhancement of photovoltaic performance of PSCs. Both short-circuit current density and PCE of the PSCs prepared by RTA were improved by 10%, compared to those of PSCs prepared by hot-plate annealing.

Original languageEnglish
Pages (from-to)14868-14875
Number of pages8
JournalRSC Advances
Volume9
Issue number26
DOIs
Publication statusPublished - 2019 Jan 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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    Park, J., Choi, J. W., Kim, W., Lee, R., Woo, H. C., Shin, J., Kim, H., Son, Y. J., Jo, J. Y., Lee, H., Kwon, S., Lee, C. L., & Jung, G. Y. (2019). Improvement of perovskite crystallinity by omnidirectional heat transfer via radiative thermal annealing. RSC Advances, 9(26), 14868-14875. https://doi.org/10.1039/c9ra01309a