Shallow Iodine Defects Accelerate the Degradation of α-Phase Formamidinium Perovskite
By Shaun Tan, I. Yavuz, M. Weber, Tianyi Huang, Chung-Hao Chen, Rui Wang, Hao-Cheng Wang, J. Ko, Selbi Nuryyeva, Jingjing Xue and 4 more. Joule, 2020
248 citations recorded by the source corpus.
Summary Shallow defects are mostly benign in covalent semiconductors, such as silicon, given that they do not constitute non-radiative recombination sites. In contrast, the existence of shallow defects in ionic perovskite crystals might have significant repercussions on the long-term stability of perovskite solar cells (PSCs) because of the metastability of the ubiquitous formamidinium lead triiodide (FAPbI3) perovskite and the migration of charged point defects. Here, we show that shallow iodine interstitial defects ( I i ) can be generated unintentionally during commonly used post-fabrication treatments, which can lower the cubic-to-hexagonal transformation barrier of FAPbI3-based perovskites to accelerate its phase degradation. We demonstrate that concurrently avoiding the generation of I i and the more effective passivation of iodine vacancies ( V I ) can improve the thermodynamic stability of the films and operational stability of the PSCs. Our most stable PSC retained 92.1 % of its initial performance after nearly 1,000 h of continuous illumination operational stability testing.
Subfields: Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/25ac937174d24b837bf986508644883a2870dd6e
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Electrical and Electronic Engineering
In Materials Chemistry
Citations in the corpus
- Decoupling the effects of defects on efficiency and stability through phosphonates in stable halide perovskite solar cells (2021, background): “A further understanding of the nature of the different binding modes of the functional groups of additives in HPs will likely be essential for the development of stable operational PSCs.”