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Ligand‐Modulated Excess PbI 2 Nanosheets for Highly Efficient and Stable Perovskite Solar Cells
- Source :
- Advanced Materials. 32:2000865
- Publication Year :
- 2020
- Publisher :
- Wiley, 2020.
-
Abstract
- Excess lead iodide (PbI2 ), as a defect passivation material in perovskite films, contributes to the longer carrier lifetime and reduced halide vacancies for high-efficiency perovskite solar cells. However, the random distribution of excess PbI2 also leads to accelerated degradation of the perovskite layer. Inspired by nanocrystal synthesis, here, a universal ligand-modulation technology is developed to modulate the shape and distribution of excess PbI2 in perovskite films. By adding certain ligands, perovskite films with vertically distributed PbI2 nanosheets between the grain boundaries are successfully achieved, which reduces the nonradiative recombination and trap density of the perovskite layer. Thus, the power conversion efficiency of the modulated device increases from 20% to 22% compared to the control device. In addition, benefiting from the vertical distribution of excess PbI2 and the hydrophobic nature of the surface ligands, the modulated devices exhibit much longer stability, retaining 72% of their initial efficiency after 360 h constant illumination under maximum power point tracking measurement.
- Subjects :
- chemistry.chemical_classification
Materials science
Passivation
business.industry
Mechanical Engineering
Energy conversion efficiency
Iodide
Halide
02 engineering and technology
Carrier lifetime
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
chemistry
Nanocrystal
Mechanics of Materials
Optoelectronics
General Materials Science
Grain boundary
0210 nano-technology
business
Perovskite (structure)
Subjects
Details
- ISSN :
- 15214095 and 09359648
- Volume :
- 32
- Database :
- OpenAIRE
- Journal :
- Advanced Materials
- Accession number :
- edsair.doi...........f3d1b4758f7937d15f744ec991de868e