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Addition of Monovalent Silver Cations to CH3NH3PbBr3 Produces Crystallographically Oriented Perovskite Thin Films

Siegler, Timothy D.; Zhang, Yangning; Dolocan, Andrei; Reimnitz, Lauren C.; Torabi, Aida; Abney, Michael K.; Choi, Junho; Cossio, Gabriel; Houck, Daniel W.; Yu, Edward T.; Li, Xiaoqin; Harvey, Taylor B.; Milliron, Delia J.; Korgel, Brian A.

By 27 January 2020No Comments

ACS Applied Energy Materials, 2019, vol 2, 8, pp. 6087-6096



The incorporation of monovalent silver (Ag+) cations into methylammonium lead bromide (CH3NH3PbBr3) perovskite films leads to a strongly preferred (001) crystallographic orientation on a wide variety of substrates, ranging from glass to mesoporous TiO2. CH3NH3PbBr3 films deposited without Ag+ exhibit only a weakly preferred (011) orientation. Compositional maps and depth profiles from time-of-flight secondary ion mass spectrometry (TOF-SIMS) reveal Ag+ segregated to grain boundaries and interfaces. In photovoltaic devices (PVs), addition of Ag+ to MAPBr films resulted in poorer device performance, most likely because of the observed Ag+ segregation in the films.

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