Chemical sintering reduced grain boundary defects for stable planar perovskite solar cells
| Autor: | Aditya Sadhanala, Jun Xi, R. Vasant Kumar, Hua Dong, Zhaoxin Wu, Christopher Harris, Xun Hou, Bo Jiao, Chenxin Ran, Kelvin H. L. Zhang, Ting Lei, Fang Yuan, Kai Xi, Guangru Li, Paul R. Coxon |
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| Rok vydání: | 2019 |
| Předmět: |
Imagination
Chemical substance Materials science Renewable Energy Sustainability and the Environment business.industry media_common.quotation_subject Photovoltaic system Energy conversion efficiency Sintering 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention law Solar cell Optoelectronics General Materials Science Grain boundary Electrical and Electronic Engineering 0210 nano-technology Science technology and society business media_common |
| Zdroj: | Nano Energy. 56:741-750 |
| ISSN: | 2211-2855 |
| DOI: | 10.1016/j.nanoen.2018.11.021 |
| Popis: | Organic–inorganic hybrid perovskite solar cells have attracted tremendous attention in photovoltaic research, but the presence of massive parasitic traps at the grain boundaries in perovskite films discourages efficient bimolecular recombination and carrier dynamics, which limits device performance and stability. Here we report a simple and fast chemical sintering protocol to substantially reduce grain boundary defects for as-formed films for different PbI2-templated perovskite materials. With this method parasitic traps on grain boundaries are intrinsically reduced, featuring the Urbach energy reduced by 1.5 meV. For optimal photovoltaic devices, we demonstrate a planar solar cell with power conversion efficiency (PCE) of 19.68% which retains 80% of this efficiency over 720 h in ambient air without any encapsulation. These findings offer a widely applicable, versatile process to efficiently reduce grain boundary defects and will be of interest to many other film material systems afflicted by polydispersity and grain boundary disturbances. |
| Databáze: | OpenAIRE |
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