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Triple-cation mixed-halide perovskites: towards efficient, annealing-free and air-stable solar cells enabled by Pb(SCN) 2 additive

View Article: PubMed Central - PubMed

ABSTRACT

Organo-metal halide perovskites have suffered undesirably from structural and thermal instabilities. Moreover, thermal annealing is often indispensable to the crystallization of perovskites and removal of residual solvents, which is unsuitable for scalable fabrication of flexible solar modules. Herein, we demonstrate the non-thermal annealing fabrication of a novel type of air-stable triple-cation mixed-halide perovskites, FA0.7MA0.2Cs0.1Pb(I5/6Br1/6)3 (FMC) by incorporation of Pb(SCN)2 additive. It is found that adding Pb(SCN)2 functions the same as thermal annealing process by not only improving the crystallinity and optical absorption of perovskites, but also hindering the formation of morphological defects and non-radiative recombination. Furthermore, such Pb(SCN)2-treated FMC unannealed films present micrometer-sized crystal grains and remarkably high moisture stability. Planar solar cells built upon these unannealed films exhibit a high PCE of 14.09% with significantly suppressed hysteresis phenomenon compared to those of thermal annealing. The corresponding room-temperature fabricated flexible solar cell shows an impressive PCE of 10.55%. This work offers a new avenue to low-temperature fabrication of air-stable, flexible and high-efficiency perovskite solar cells.

No MeSH data available.


Optical characteristics of different perovskite thin-films.(a) UV-vis absorption coefficient (ε), (b) steady-state photoluminescence spectra and (C) time-resolved photoluminescence profiles of annealed FAPbI3 (A), unannealed FMC (B), annealed FMC (C), unannealed FMC with Pb(SCN)2 (D), and annealed FMC with Pb(SCN)2 (E).
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f2: Optical characteristics of different perovskite thin-films.(a) UV-vis absorption coefficient (ε), (b) steady-state photoluminescence spectra and (C) time-resolved photoluminescence profiles of annealed FAPbI3 (A), unannealed FMC (B), annealed FMC (C), unannealed FMC with Pb(SCN)2 (D), and annealed FMC with Pb(SCN)2 (E).

Mentions: Different crystallization dynamics of the above perovskites would strongly impact their optical properties. Thus, we measured and compared their optical absorption spectra. As shown in Fig. 2a, all FMC samples without or with Pb(SCN)2 exhibit notably stronger absorption at 400–750 nm than FAPbI3 counterpart. Meanwhile, the absorption intensity of annealed FMC sample is considerably larger than that of unannealed analogue, indicating the important role of thermal annealing process in the formation of perovskite phase. However, upon adding Pb(SCN)2, both unannealed and annealed FMC samples show almost identical absorption spectra, meaning that perovskites phase can be successfully formed even at room temperature with the aid of Pb(SCN)2.


Triple-cation mixed-halide perovskites: towards efficient, annealing-free and air-stable solar cells enabled by Pb(SCN) 2 additive
Optical characteristics of different perovskite thin-films.(a) UV-vis absorption coefficient (ε), (b) steady-state photoluminescence spectra and (C) time-resolved photoluminescence profiles of annealed FAPbI3 (A), unannealed FMC (B), annealed FMC (C), unannealed FMC with Pb(SCN)2 (D), and annealed FMC with Pb(SCN)2 (E).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5382775&req=5

f2: Optical characteristics of different perovskite thin-films.(a) UV-vis absorption coefficient (ε), (b) steady-state photoluminescence spectra and (C) time-resolved photoluminescence profiles of annealed FAPbI3 (A), unannealed FMC (B), annealed FMC (C), unannealed FMC with Pb(SCN)2 (D), and annealed FMC with Pb(SCN)2 (E).
Mentions: Different crystallization dynamics of the above perovskites would strongly impact their optical properties. Thus, we measured and compared their optical absorption spectra. As shown in Fig. 2a, all FMC samples without or with Pb(SCN)2 exhibit notably stronger absorption at 400–750 nm than FAPbI3 counterpart. Meanwhile, the absorption intensity of annealed FMC sample is considerably larger than that of unannealed analogue, indicating the important role of thermal annealing process in the formation of perovskite phase. However, upon adding Pb(SCN)2, both unannealed and annealed FMC samples show almost identical absorption spectra, meaning that perovskites phase can be successfully formed even at room temperature with the aid of Pb(SCN)2.

View Article: PubMed Central - PubMed

ABSTRACT

Organo-metal halide perovskites have suffered undesirably from structural and thermal instabilities. Moreover, thermal annealing is often indispensable to the crystallization of perovskites and removal of residual solvents, which is unsuitable for scalable fabrication of flexible solar modules. Herein, we demonstrate the non-thermal annealing fabrication of a novel type of air-stable triple-cation mixed-halide perovskites, FA0.7MA0.2Cs0.1Pb(I5/6Br1/6)3 (FMC) by incorporation of Pb(SCN)2 additive. It is found that adding Pb(SCN)2 functions the same as thermal annealing process by not only improving the crystallinity and optical absorption of perovskites, but also hindering the formation of morphological defects and non-radiative recombination. Furthermore, such Pb(SCN)2-treated FMC unannealed films present micrometer-sized crystal grains and remarkably high moisture stability. Planar solar cells built upon these unannealed films exhibit a high PCE of 14.09% with significantly suppressed hysteresis phenomenon compared to those of thermal annealing. The corresponding room-temperature fabricated flexible solar cell shows an impressive PCE of 10.55%. This work offers a new avenue to low-temperature fabrication of air-stable, flexible and high-efficiency perovskite solar cells.

No MeSH data available.