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Title: Effect of cation composition on the mechanical stability of perovskite solar cells
Authors: Rolston, Nicholas
Printz, Adam D.
Tracy, Jared M.
Weerasinghe, Hashita C.
Vak, Doojin
Haur, Lew Jia
Priyadarshi, Anish
Mathews, Nripan
Slotcavage, Daniel J.
McGehee, Michael D.
Kalan, Roghi E.
Zielinski, Kenneth
Grimm, Ronald L.
Tsai, Hsinhan
Nie, Wanyi
Mohite, Aditya D.
Gholipour, Somayeh
Saliba, Michael
Grätzel, Michael
Dauskardt, Reinhold H.
Keywords: Engineering::Materials
Issue Date: 2017
Source: Rolston, N., Printz, A. D., Tracy, J. M., Weerasinghe, H. C., Vak, D., Haur, L. J., . . . Dauskardt, R. H. (2018). Effect of cation composition on the mechanical stability of perovskite solar cells. Advanced Energy Materials, 8(9), 1702116-. doi:10.1002/aenm.201702116
Journal: Advanced Energy Materials
Abstract: Photoactive perovskite semiconductors are highly tunable, with numerous inorganic and organic cations readily incorporated to modify optoelectronic properties. However, despite the importance of device reliability and long service lifetimes, the effects of various cations on the mechanical properties of perovskites are largely overlooked. In this study, the cohesion energy of perovskites containing various cation combinations of methylammonium, formamidinium, cesium, butylammonium, and 5-aminovaleric acid is reported. A trade-off is observed between the mechanical integrity and the efficiency of perovskite devices. High efficiency devices exhibit decreased cohesion, which is attributed to reduced grain sizes with the inclusion of additional cations and PbI2 additives. Microindentation hardness testing is performed to estimate the fracture toughness of single-crystal perovskite, and the results indicated perovskites are inherently fragile, even in the absence of grain boundaries and defects. The devices found to have the highest fracture energies are perovskites infiltrated into a porous TiO2/ZrO2/C triple layer, which provide extrinsic reinforcement and shielding for enhanced mechanical and chemical stability.
ISSN: 1614-6832
DOI: 10.1002/aenm.201702116
Schools: School of Materials Science & Engineering 
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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