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000904109 0247_ $$2doi$$a10.1021/acsenergylett.1c01187
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000904109 1001_ $$00000-0002-5565-0954$$aOchoa-Martinez, Efrain$$b0
000904109 245__ $$aPhysical Passivation of Grain Boundaries and Defects in Perovskite Solar Cells by an Isolating Thin Polymer
000904109 260__ $$aWashington, DC$$bAmerican Chemical Society$$c2021
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000904109 520__ $$aPassivation and interlayer engineering are important approaches to increase the efficiency and stability of perovskite solar cells. Thin insulating dielectric films at the interface between the perovskite and the charge carrier transport layers have been suggested to passivate surface defects. Here, we analyze the effect of depositing poly(methyl methacrylate) (PMMA) from a very low-concentration solution. Spatial- and time-resolved photoluminescence and atomic force microscopy analyses of samples with diverse morphologies demonstrate the preferential deposition of PMMA in topographic depressions of the perovskite layer, such as grain and domain boundaries. This treatment results in an increase in the fill factor of more than 4% and an absolute efficiency boost exceeding 1%, with a maximum efficiency of 20.4%. Based on these results, we propose a physical isolation mechanism rather than a chemical passivation of perovskite defects, which explains not only the data of this study but also most results found in earlier works.
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000904109 7001_ $$0P:(DE-HGF)0$$aOchoa, Mario$$b1
000904109 7001_ $$0P:(DE-HGF)0$$aOrtuso, Roberto D.$$b2
000904109 7001_ $$0P:(DE-HGF)0$$aFerdowsi, Parnian$$b3
000904109 7001_ $$0P:(DE-HGF)0$$aCarron, Romain$$b4
000904109 7001_ $$0P:(DE-HGF)0$$aTiwari, Ayodhya N.$$b5
000904109 7001_ $$00000-0001-5936-339X$$aSteiner, Ullrich$$b6
000904109 7001_ $$0P:(DE-Juel1)180101$$aSaliba, Michael$$b7$$eCorresponding author
000904109 773__ $$0PERI:(DE-600)2864177-2$$a10.1021/acsenergylett.1c01187$$gVol. 6, no. 7, p. 2626 - 2634$$n7$$p2626 - 2634$$tACS energy letters$$v6$$x2380-8195$$y2021
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