@article{Chen2021, 
author = {Hongye Chen and Liaoyu Wang and Chun Shen and Jiahuan Zhang and Wanlin Guo},
title = {Strong electron-ion coupling in gradient halide perovskite heterojunction},
year = {2021},
journal = {Nano Research},
volume = {14},
number = {4},
pages = {1012-1017},
keywords = {photoluminescence, halide perovskite films, gradient heterojunctions, electron-ion couplings},
url = {https://www.sciopen.com/article/10.1007/s12274-020-3143-8},
doi = {10.1007/s12274-020-3143-8},
abstract = {The electron-ion coupling in iontronics has great significance and potential for energy conversion and storage devices. However, it is a substantial challenge to integrate iontronics into all-solid-state semiconductor circuits and explore the electron-ion coupling in semiconductor devices. Here, by utilizing the organic-inorganic halide perovskite, we fabricate a planar heterojunction with a gradient distribution of halide anions. The diode-like halide migration was investigated by bias voltage induced asymmetric blue shift in photoluminescence spectrum. This pseudo-ionic diode behaviour was found to result from asymmetric charge injection characterized by I-V curves and gradient-halides-induced vacancy hopping indicated by energy dispersive spectroscopy (EDS). The planar gradient perovskite heterojunction provides a viable route for extending iontronic devices into the regime of all-solid-state semiconductors.}
}