P-type charge transport and selective gas sensing of all-inorganic perovskite nanocrystals

Jiyun Kim, Long Hu, Hongjun Chen, Xinwei Guan, Pradeep Raja Anandan, Feng Li, Jianbo Tang, Chun-Ho Lin*, Kourosh Kalantar-Zadeh, Antonio Tricoli, Tom Wu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


The remarkable optoelectronic property of all-inorganic halide perovskite nanocrystals (NCs) has inspired the exploration of these materials for a wide range of applications. However, the low conductivity of perovskite NCs thin film is regarded as the Achilles' heel, hindering further development in electronic usage. To address this issue, we employed sequential treatments of methyl acetate soft soaking and Ostwald ripening on CsPbBr3NC thin films, which improve the transport property and dramatically enhance the carrier lifetime from 11.56 to 112.5 ns. The field-effect transistor (FET) based on resulting CsPbBr3NCs thin film exhibits p-type carrier mobility of 0.023 cm2V-1s-1and ON/OFF ratio up to ∼104, which is on par with the bulk perovskite-based FETs. Furthermore, as a proof of concept, we demonstrate that the p-type CsPbBr3NCs feature high gas-sensing selectivity to detect NO2with a detection limit down to 0.4 ppm. The appealing charge-transport properties of these CsPbBr3NCs underscore their potentials for versatile applications.

Original languageEnglish
Pages (from-to)1368-1374
Number of pages7
JournalACS Materials Letters
Issue number11
Publication statusPublished - 2 Nov 2020
Externally publishedYes


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