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- W2279909786 abstract "Methyl ammonium lead halides (MAPbX3 , X=Cl-, Br-,I-), crystallizing in a perovskite structure, have in recent years been shown to be a promising material as a light harvesting material in solar cells. It has many interesting properties which makes it suitable for solar cell applications, such as near-optimal band gap and long electron-hole diffusion lengths, as well as the possibility of synthesizing the films from solution based methods. It is also possible to tune the band gap by making mixed compounds of MAPb(I1-xBrx)3 (0≤x≤1), which could make this compound suitable for tandem cell applications. In order to optimize these perovskites for tandem cells, there are many steps and properties that need investigation. In this work, band gap tuning and structural properties were investigated using both optical techniques such as UV-Vis and Photoluminescence, as well as X-Ray Diffraction. Furthermore, the effect of annealing was studied by making measurements before and after annealing. Also, theoretical calculations of tandem cells were done to find the optimal band gap for MAPb(I1-xBrx)3. Bang gap tuning was achieved for MAPb(I1-xBrx)3 and the most efficient composition was calculated to MAPbI1.05Br1.95. Studies of annealing showed that the band gap onset becomes sharper after annealing. Peaks in XRD also became narrower, indicating either more homogenous samples or larger crystallite size. When MAPb(I1-xBrx)3 is illuminated with light, a phase splitting occurs creating multiple band gaps. This may be a problem for tandem cells, since the optimal band gap is not stable. Due to the phase splitting, a 4-terminal solar cell may be the preferred choice since the efficiency calculations show that the efficiency is less prone to change as the band gap is varied. Developing stable MAPb(I1-xBrx)3 is necessary to produce efficient tandem solar cells. (Less)" @default.
- W2279909786 created "2016-06-24" @default.
- W2279909786 creator A5063283954 @default.
- W2279909786 date "2016-01-01" @default.
- W2279909786 modified "2023-09-27" @default.
- W2279909786 title "Role of annealing and photostability of organo-metal-halide semiconductors for solar cell applications" @default.
- W2279909786 hasPublicationYear "2016" @default.
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