Journal
ACS NANO
Volume 15, Issue 5, Pages 9017-9026Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c02097
Keywords
metal halide perovskites; decomposition; ion migration; cation; hysteretic; interfacial ions; charge carriers
Categories
Funding
- U.S. Department of Energy [DE-AC05-00OR22725]
Ask authors/readers for more resources
Ion migration plays a crucial role in metal halide perovskite semiconductor devices, but the mechanisms and effects are not fully understood. Direct observation reveals that decomposition products of CH3NH3+ accumulate at interfaces under light and bias conditions, impacting device performance and stability, highlighting the need for consideration in future optimization studies.
Ion migration is one of the most debated mechanisms and credited with multiple observed phenomena and performance in metal halide perovskites (MHPs) semiconductor devices. However, to date, the migration of ions and their effects on MHPs are not still fully understood, largely due to a lack of direct observations of temporal ion migration. In this work, using direct observation of ion migration in-operando, we observe the hysteretic migration behavior of intrinsic ions (i.e., CH3NH3+ and I-) as well as reveal the migration behavior of CH3NH3+ decomposition ions. We find that CH3NH3+ decomposition products can be affected by light and accumulate at the interfaces under bias. These MHP decomposition products are tightly related to the device performance and stability. Complementary results of time-resolved Kelvin probe force microscopy (tr-KPFM) demonstrate a correlation between dynamics of these interfacial ions and charge carriers. Overall, we find that there are a number of mobile ions including CH3NH3+ decomposition products in MHPs that need to be taken into account when measuring MHP device responses (e.g., charge dynamics) and should be considered in future optimization studies of MHP semiconductor devices.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available