Source abstract
Abstract
Abstract Effective passivation and stabilization of both the inside and interface of a perovskite layer are crucial for perovskite solar cells (PSCs), in terms of efficiency, reproducibility, and stability. Here, the first formamidinium lead iodide (δ‐FAPbI3) polymorph passivated and stabilized MAPbI3 PSCs are reported. This novel MAPbI3/δ‐FAPbI3 structure is realized via treating a mixed organic cation MA x FA1‐ x PbI3 perovskite film with methylamine (MA) gas. In addition to the morphology healing, MA gas can also induce the formation of δ‐FAPbI3 phase within the perovskite film. The in situ formed 1D δ‐FAPbI3 polymorph behaves like an organic scaffold that can passivate the trap state, tunnel contact, and restrict organic‐cation diffusion. As a result, the device efficiency is easily boosted to 21%. Furthermore, the stability of the MAPbI3/δ‐FAPbI3 film is also obviously improved. This δ‐FAPbI3 phase passivation strategy opens up a new direction of perovskite structure modification for further improving stability without sacrificing efficiency.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Perovskite Materials and Applications · Electronic and Structural Properties of Oxides · Solid-state spectroscopy and crystallography
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Group for Molecular Engineering of Functional Materials EPFL Valais Wallis CH‐1951 Sion Switzerland
Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 P. R. China
CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 P. R. China
Interdisciplinary Centre for Electron Microscopy EPFL CH‐1015 Lausanne Switzerland
Funding
National Natural Science Foundation of China · Youth Innovation Promotion Association of the Chinese Academy of Sciences · Chinese Academy of Sciences
References (43)
Show source-provided references
2. “National Renewable Energy Laboratory Best Research‐Cell Efficiencies” can be found underhttp://www.nrel.gov/ncpv/images/efficiency_chart.jpg(accessed: July 2017).