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Blading Phase‐Pure Formamidinium‐Alloyed Perovskites for High‐Efficiency Solar Cells with Low Photovoltage Deficit and Improved Stability
- Source :
- Advanced Materials. 32:2000995
- Publication Year :
- 2020
- Publisher :
- Wiley, 2020.
-
Abstract
- Currently, blade-coated perovskite solar cells (PSCs) with high power conversion efficiencies (PCEs), that is, greater than 20%, normally employ methylammonium lead tri-iodide with a sub-optimal bandgap. Alloyed perovskites with formamidinium (FA) cation have narrower bandgap and thus enhance device photocurrent. However, FA-alloyed perovskites show low phase stability and high moisture sensitivity. Here, it is reported that incorporating 0.83 molar percent organic halide salts (OHs) into perovskite inks enables phase-pure, highly crystalline FA-alloyed perovskites with extraordinary optoelectronic properties. The OH molecules modulate the crystal growth, enhance the phase stability, passivate ionic defects at the surface and/or grain boundaries, and enhance the moisture stability of the perovskite film. A high efficiency of 22.0% under 1 sun illumination for blade-coated PSCs is demonstrated with an open-circuit voltage of 1.18 V, corresponding to a very small voltage deficit of 0.33 V, and significantly improved operational stability with 96% of the initial efficiency retained under one sun illumination for 500 h.
- Subjects :
- Photocurrent
Materials science
Passivation
Band gap
business.industry
Mechanical Engineering
Crystal growth
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
7. Clean energy
0104 chemical sciences
Formamidinium
Mechanics of Materials
Phase (matter)
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.dedup.....0c5befdcbe12e8401339ba43dd31d53d