Unveiling the role of linear alkyl organic cations in 2D layered tin halide perovskite field-effect transistors
Shuanglong Wang, Shankeerthan Kalyanasundaram, Lei Gao, Zhitian Ling, Zhiwen Zhou, Mischa Bonn, Paul W. M. Blom, Hai I. Wang, Wojciech Pisula, Tomasz Marszałek
Abstract
, as confirmed by optical-pump terahertz spectroscopy. A similar improved macroscopic charge transport is also observed in FETs, only to the chain length of HA, due to the synergistic enhancement of film morphology and molecular organization. While the mobility increases with the temperature rise from 100 K to 200 K due to the thermally activated transport mechanism, the device performance decreases in the temperature range of 200 K to 295 K because of ion migration. These results provide guidelines on rational design principles of organic spacer cations for 2D tin halide perovskites and contribute to other optoelectronic applications.