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A Gradient Heterostructure Based on Tolerance Factor in High-Performance Perovskite Solar Cells with 0.84 Fill Factor
- Source :
- Advanced Materials. 31:1804217
- Publication Year :
- 2018
- Publisher :
- Wiley, 2018.
-
Abstract
- A gradient heterosturcture is one of the basic methods to control the charge flow in perovskite solar cells (PSCs). However, a classical route for gradient heterosturctures is based on the diffusion technique, in which the guest ions gradually diffuse into the films from a concentrated source of dopants. The gradient heterosturcture is only accessible to the top side, and may be time consuming and costly. Here, the "intolerant" n-type heteroatoms (Sb3+ , In3+ ) with mismatched cation sizes and charge states can spontaneously enrich two sides of perovskite thin films. The dopants at specific sides can be extracted by a typical hole-transport layer. Theoretical calculations and experimental observations both indicate that the optimized charge management can be attributed to the tailored band structure and interfacial electronic hybridization, which promote charge separation and collection. The strategy enables the fabrication of PSCs with a spontaneous graded heterojunction showing high efficiency. A champion device based on Sb3+ doped film shows a stabilized power-conversion efficiency of 21.04% with a high fill factor of 0.84 and small hysteresis.
- Subjects :
- Materials science
Dopant
business.industry
Mechanical Engineering
Diffusion
Doping
Heterojunction
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Hysteresis
Mechanics of Materials
Optoelectronics
General Materials Science
Thin film
0210 nano-technology
business
Electronic band structure
Perovskite (structure)
Subjects
Details
- ISSN :
- 09359648
- Volume :
- 31
- Database :
- OpenAIRE
- Journal :
- Advanced Materials
- Accession number :
- edsair.doi.dedup.....a7a64ca8d61cac3fa57d896aeeb8214c