Excellent carrier transport property of hybrid perovskites under high pressures

In perovskite optoelectronic devices, the bearer mobility (or diffusivity) and diffusion magnitude are cardinal properties that find performance.

However, constricted by the tiny moving abstraction successful a diamond anvil cell and the wrong unit transmitting media, the measurements of complaint mobility and diffusion magnitude successful a diamond anvil compartment are challenging by utilizing accepted electrical techniques.

Recently, a probe radical led by Prof. Jin Shengye from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS) revealed fantabulous bearer transport spot of hybrid perovskites nether precocious pressures.

This survey was published successful ACS Energy Letters connected Dec. 8.

By combining time-resolved and PL-scanned imaging microscopy with a diamond anvil compartment apparatus, the researchers successful situ measured the photoinduced bearer transport successful MAPbI₃ perovskite microcrystals nether high pressure up to 5.7 GPa, erstwhile the perovskites retained azygous crystal phase.

They recovered that the MAPbI₃ microcrystals exhibited tetragonal-to-cubic signifier modulation astatine 0.3–0.4 GPa and isostructural signifier modulation astatine astir 3 GPa arsenic the unit increased.

Moreover, done the nonstop introspection of bearer transport dynamics successful a diamond anvil cell, the researchers discovered that the diffusion coefficient of perovskites showed an summation by much than 30% erstwhile the unit was implicit 0.4 GPa. Combining the corresponding bearer lifetimes, they recovered the bearer diffusion length (LD) was from 5 to 8 um nether antithetic pressures.

This survey suggested that the MAPbI₃ perovskites could prolong their fantabulous bearer transport properties nether unit treatment, adjacent though the unit could origin important structural defects to the crystal.

"This enactment sheds airy connected the power of pressure connected the bearer transport successful MAPbI₃ perovskites and paves the mode for the utilization of compression to tune oregon optimize the optoelectronic properties of perovskites," said Prof. Jin.

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More information: Yanfeng Yin et al, Excellent Carrier Transport Property of Hybrid Perovskites Sustained nether High Pressures, ACS Energy Letters (2021). DOI: 10.1021/acsenergylett.1c02359