Potassium- and Rubidium-Passivated Alloyed Perovskite Films: Optoelectronic Properties and Moisture Stability

Jalebi, Mojtaba AbdiUniv Cambridge, Dept Phys, Cavendish Lab, Cambridge CB3 0HE, England (författare)

Potassium- and Rubidium-Passivated Alloyed Perovskite Films : Optoelectronic Properties and Moisture Stability

Halide perovskites passivated with potassium or rubidium show superior photovoltaic device performance compared to unpassivated samples. However, it is unclear which passivation route is more effective for film stability. Here, we directly compare the optoelectronic properties and stability of thin films when passivating triple-cation perovskite films with potassium or rubidium species. The optoelectronic and chemical studies reveal that the alloyed perovskites are tolerant toward higher loadings of potassium than rubidium. Whereas potassium complexes with bromide from the perovskite precursor solution to form thin surface passivation layers, rubidium additives favor the formation of phase-segregated micron-sized rubidium halide crystals. This tolerance to higher loadings of potassium allows us to achieve superior passivation. We also find that exposure to a humid atmosphere drives phase luminescent properties with potassium segregation and grain coalescence for all compositions, with the rubidium-passivated sample showing the highest sensitivity to nonperovskite phase formation. Our work highlights the benefits but also the limitations of these passivation approaches in maximizing both optoelectronic properties and the stability of perovskite films.

Andaji-Garmaroudi, PzahraUniv Cambridge, Dept Phys, Cavendish Lab, Cambridge CB3 0HE, England (författare)
Pearson, Andrew J.Univ Cambridge, Dept Phys, Cavendish Lab, Cambridge CB3 0HE, England (författare)
Divitini, GiorgioUniv Cambridge, Dept Mat Sci & Met, Cambridge CB3 0FS, England (författare)
Cacovich, StefaniaUniv Cambridge, Dept Mat Sci & Met, Cambridge CB3 0FS, England;Inst Photovolta IledeFrance IPVF 30, Route Dept 128, F-91120 Palaiseau, France (författare)
Philippe, Bertrand,Dr.1986-Uppsala universitet,Molekyl- och kondenserade materiens fysik(Swepub:uu)phibe331 (författare)
Rensmo, HåkanUppsala universitet,Molekyl- och kondenserade materiens fysik(Swepub:uu)hakanrm (författare)
Ducati, CaterinaUniv Cambridge, Dept Mat Sci & Met, Cambridge CB3 0FS, England (författare)
Friend, Richard H.Univ Cambridge, Dept Phys, Cavendish Lab, Cambridge CB3 0HE, England (författare)
Stranks, Samuel D.Univ Cambridge, Dept Phys, Cavendish Lab, Cambridge CB3 0HE, England (författare)
Univ Cambridge, Dept Phys, Cavendish Lab, Cambridge CB3 0HE, EnglandUniv Cambridge, Dept Mat Sci & Met, Cambridge CB3 0FS, England (creator_code:org_t)

Ingår i:ACS Energy Letters: American Chemical Society (ACS)3:11, s. 2671-26782380-8195

Av författaren/redakt...: Jalebi, Mojtaba ...; Andaji-Garmaroud ...; Pearson, Andrew ...; Divitini, Giorgi ...; Cacovich, Stefan ...; Philippe, Bertra ...; visa fler...; Rensmo, Håkan; Ducati, Caterina; Friend, Richard ...; Stranks, Samuel ...; visa färre...

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