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000902964 1001_ $$0P:(DE-Juel1)180881$$aKulkarni, Ashish$$b0$$eCorresponding author
000902964 245__ $$aConcerted Ion Migration and Diffusion‐Induced Degradation in Lead‐Free Ag 3 BiI 6 Rudorffite Solar Cells under Ambient Conditions
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000902964 520__ $$aSilver bismuth iodide (SBI) materials have recently gained attention as nontoxic alternatives to lead perovskites. Although most of the studies have been focusing on photovoltaic performance, the inherent ionic nature of SBI materials, their diffusive behavior, and influence on material/device stability is underexplored. Herein, AgBi2I7, Ag2BiI5, and Ag3BiI6 thin films are developed in controlled ambient humidity conditions with a decent efficiency up to 2.32%. While exploring the device stability, it is found that Ag3BiI6 exhibits a unique ion-migration behavior where Ag+, Bi3+, and I− ions migrate and diffuse through the dopant-free hole transport layer (HTL) leading to degradation. Interestingly, this ion-migration behavior is relatively fast for the case of antisolvent-processed Ag3BiI6 thin-film-based devices contrasting the case of without antisolvent and is not observed for other SBI material-based devices. Theoretical calculations suggest that low decomposition enthalpy favors the decomposition of Ag3BiI6 to AgI and BiI3 causing migration of ions to the electrode which is protected by using a thick HTL . The new mechanism reported herein underlines the importance of SBI material composition and fundamental mechanism understanding on the stability of Ag3BiI6 material for better solar cell design and also in extending the applications of unique ion-migration behavior in various optoelectronics.
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000902964 7001_ $$0P:(DE-HGF)0$$aÜnlü, Feray$$b1
000902964 7001_ $$0P:(DE-HGF)0$$aPant, Namrata$$b2
000902964 7001_ $$0P:(DE-HGF)0$$aKaur, Jagjit$$b3
000902964 7001_ $$0P:(DE-HGF)0$$aBohr, Christoph$$b4
000902964 7001_ $$0P:(DE-HGF)0$$aJena, Ajay Kumar$$b5
000902964 7001_ $$0P:(DE-HGF)0$$aÖz, Senol$$b6
000902964 7001_ $$0P:(DE-HGF)0$$aYanagida, Masatoshi$$b7
000902964 7001_ $$0P:(DE-HGF)0$$aShirai, Yasuhiro$$b8
000902964 7001_ $$0P:(DE-HGF)0$$aIkegami, Masashi$$b9
000902964 7001_ $$0P:(DE-HGF)0$$aMiyano, Kenjiro$$b10
000902964 7001_ $$0P:(DE-HGF)0$$aTachibana, Yasuhiro$$b11
000902964 7001_ $$0P:(DE-HGF)0$$aChakraborty, Sudip$$b12
000902964 7001_ $$0P:(DE-HGF)0$$aMathur, Sanjay$$b13
000902964 7001_ $$0P:(DE-HGF)0$$aMiyasaka, Tsutomu$$b14$$eCorresponding author
000902964 773__ $$0PERI:(DE-600)2882014-9$$a10.1002/solr.202100077$$gVol. 5, no. 8, p. 2100077 -$$n8$$p2100077$$tSolar RRL$$v5$$x2367-198X$$y2021
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000902964 8564_ $$uhttps://juser.fz-juelich.de/record/902964/files/Solar%20RRL%20-%20Main%20text.pdf$$yPublished on 2021-06-29. Available in OpenAccess from 2022-06-29.
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