Strain engineering in perovskite solar cells and its impacts on carrier dynamics
By Cheng Zhu, Xiuxiu Niu, Yuhao Fu, Nengxu Li, Chen Hu, Yihua Chen, Xin-Sheng He, Guangren Na, Pengfei Liu, Huachao Zai and 11 more. Nature Communications, 2019
825 citations recorded by the source corpus.
The mixed halide perovskites have emerged as outstanding light absorbers for efficient solar cells. Unfortunately, it reveals inhomogeneity in these polycrystalline films due to composition separation, which leads to local lattice mismatches and emergent residual strains consequently. Thus far, the understanding of these residual strains and their effects on photovoltaic device performance is absent. Herein we study the evolution of residual strain over the films by depth-dependent grazing incident X-ray diffraction measurements. We identify the gradient distribution of in-plane strain component perpendicular to the substrate. Moreover, we reveal its impacts on the carrier dynamics over corresponding solar cells, which is stemmed from the strain induced energy bands bending of the perovskite absorber as indicated by first-principles calculations. Eventually, we modulate the status of residual strains in a controllable manner, which leads to enhanced PCEs up to 20.7% (certified) in devices via rational strain engineering. The residual strains in the mixed halide perovskite thin films and their effects on the solar cell devices are less understood. Here Zhu et al. study the impact of the gradient in-plane strain on the carrier dynamics of the strained perovskite films and optimize the device efficiency.
Subfields: Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/9e16e690a4081079d9b95d199ccd740b50165bc2
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
- Stabilization of Black Perovskite Phase in FAPbI3 and CsPbI3 (2020, background): “In this frame, the chemi-structural mechanisms, taking into account strain but also interfaces and chemical bonds among different materials, will be the future way to stabilize the perovskite desired photoactive phases, or to develop the formation of new phases.(82)”
- Homogenizing out-of-plane cation composition in perovskite solar cells (2023, neutral): “Importantly, the detected lattice contraction implies that cation inhomogeneity is a contributory factor to the lattice strain 16,17 .”