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Localized incorporation of cesium ions to improve formamidinium lead iodide layers in perovskite solar cells
- Source :
- RSC Advances. 8:25645-25652
- Publication Year :
- 2018
- Publisher :
- Royal Society of Chemistry (RSC), 2018.
-
Abstract
- For the perovskite solar cells with formamidinium lead iodide (FAPbI3) as a light harvester, cesium ions (Cs+) can be used to stabilize the perovskite crystal structure of FAPbI3. However, the incorporation of Cs+ ions usually reduces the grain size and degrades the crystallization of FAPbI3 layers, and this is harmful to the photovoltaic performance of solar cells. In this work, we incorporate Cs+ ions into FAPbI3 layers using the interfacial doping method, which is different from the mixed solution doping method in previous reports. Elemental analysis indicates that Cs+ dopants cannot be detected at the outer surfaces of perovskite layers, and the majority of Cs+ dopants should be localized in the vicinity of TiO2/perovskite interfaces, which is remarkably different from the distribution of Cs+ dopants in the perovskite layers prepared using the mixed solution doping method. It is found that interfacial doping method can avoid the blue shift of the light absorption edge and can improve the crystallization of FAPbI3 layers. For the optimized conditions, CsxFA1−xPbI3 solar cells prepared using the interfacial doping method achieve a power conversion efficiency (PCE) of 17.1%, which is better than the PCE of CsxFA1−xPbI3 devices prepared using the mixed solution doping method.
- Subjects :
- chemistry.chemical_classification
Materials science
Dopant
General Chemical Engineering
Energy conversion efficiency
Doping
Iodide
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
law.invention
Ion
Formamidinium
Chemical engineering
chemistry
law
Crystallization
0210 nano-technology
Perovskite (structure)
Subjects
Details
- ISSN :
- 20462069
- Volume :
- 8
- Database :
- OpenAIRE
- Journal :
- RSC Advances
- Accession number :
- edsair.doi.dedup.....8aee7558e23f00f5d6512d430b894f52
- Full Text :
- https://doi.org/10.1039/c8ra04742a