Amine Gas‐Induced Reversible Optical Bleaching of Bismuth‐Based Lead‐Free Perovskite Thin Films

Ji, FuxiangDepartment of Chemistry‐Ångström Laboratory Physical Chemistry Uppsala University Uppsala SE‐751 20 Sweden (författare)

Funding: Aforsk [21-32]
Reversible optical property changes in lead-free perovskites have recently received great interest due to their potential applications in smart windows, sensors, data encryption, and various on-demand devices. However, it is challenging to achieve remarkable color changes in their thin films. Here, methylamine gas (CH3NH2, MA0) induced switchable optical bleaching of bismuth (Bi)-based perovskite films is demonstrated for the first time. By exposure to an MA0 atmosphere, the color of Cs2AgBiBr6 (CABB) films changes from yellow to transparent, and the color of Cs3Bi2I9 (CBI) films changes from dark red to transparent. More interestingly, the underlying reason is found to be the interactions between MA0 and Bi3+ with the formation of an amorphous liquefied transparent intermediate phase, which is different from that of lead-based perovskite systems. Moreover, the generality of this approach is demonstrated with other amine gases, including ethylamine (C2H5NH2, EA0) and butylamine (CH3(CH2)3NH2, BA0), and another compound, Cs3Sb2I9, by observing a similar reversible optical bleaching phenomenon. The potential for the application of CABB and CBI films in switchable smart windows is investigated. This study provides valuable insights into the interactions between amine gases and lead-free perovskites, opening up new possibilities for high-efficiency optoelectronic and stimuli-responsive applications of these emerging Bi-based materials.

NATURVETENSKAP Fysik Den kondenserade materiens fysik hsv//swe
NATURAL SCIENCES Physical Sciences Condensed Matter Physics hsv//eng
Cs2AgBiBr6; Cs3Bi2I9; lead-free perovskites; methylamine gas; optical bleaching; smart windows

Zhang, BinLinköpings universitet,Elektroniska och fotoniska material,Tekniska fakulteten,Functional Electronic Materials(Swepub:liu)binzh27 (författare)
Chen, Weimin,1959-Linköpings universitet,Elektroniska och fotoniska material,Tekniska fakulteten,Functional Electronic Materials(Swepub:liu)weich55 (författare)
Buyanova, Irina A,1960-Linköpings universitet,Elektroniska och fotoniska material,Tekniska fakulteten,Functional Electronic Materials(Swepub:liu)iribo40 (författare)
Wang, Feng,Assistant ProfessorLinköpings universitet,Elektroniska och fotoniska material,Tekniska fakulteten(Swepub:liu)fenwa69 (författare)
Boschloo, GerritDepartment of Chemistry‐Ångström Laboratory Physical Chemistry Uppsala University Uppsala SE‐751 20 Sweden (författare)
Department of Chemistry‐Ångström Laboratory Physical Chemistry Uppsala University Uppsala SE‐751 20 SwedenElektroniska och fotoniska material (creator_code:org_t)

Av författaren/redakt...: Ji, Fuxiang; Zhang, Bin; Chen, Weimin, 19 ...; Buyanova, Irina ...; Wang, Feng, Assi ...; Boschloo, Gerrit

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