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Synergistic effect of anions and cations in additive for highly efficient and stable perovskite solar cells

Abstract

Organic–inorganic halide perovskites have attracted intensively attention duo to their outstanding photophysical properties and high performance optoelectronic devices. The quality of the perovskites films plays an important role in affecting the performance of perovskite devices. Additives have been previously suggested the simplest and effective method to improve the quality of perovskite film. However, only cations or anions in most additives are solely capable to function as active specie in improving the quality of perovskite film. Here, we report that ammonium thiocyanate (NH4SCN) as an additive (contain NH4+ and SCN- ions) can significantly improve the quality of perovskite film compared to NH4I and Pb(SCN)2 as additives containing single active specie of NH4+ and SCN-. The synergistic effect between ions in NH4SCN was favorable for controlling the nucleation and the growth speed of the crystal grains evidently increased the grain size and markedly improved the film stability. Finally, the efficiency of device based on NH4SCN (16.47%) showed significantly enhancement without hysteresis effect compared to devices with single ion as active specie, e.g., NH4+ in NH4I (13.97%) and SCN- in Pb(SCN)2 (12.88%). The findings suggest that synergistic effect of anions and cations in additive is an effective way for realizing efficient and stable perovskites.

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Publication details

The article was received on 10 Jan 2018, accepted on 08 Apr 2018 and first published on 11 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA00308D
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Synergistic effect of anions and cations in additive for highly efficient and stable perovskite solar cells

    H. Zhang, M. Hou, Y. Xia, Q. Wei, Z. Wang, Y. Cheng, Y. Chen and W. Huang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA00308D

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