Carbon nanotubes as an efficient hole collector for high voltage methylammonium lead bromide perovskite solar cells
- Li, Zhen
- Boix, Pablo P.
- Xing, Guichuan
- Fu, Kunwu
- Kulkarni, Sneha A.
- Batabyal, Sudip K.
- Xu, Wenjing
- Cao, Anyuan
- Sum, Tze Chien
- Mathews, Nripan
- Wong, Lydia Helena
DOIAbstract
A high open circuit voltage (VOC) close to 1.4 V under AM 1.5, 100 mW cm(-2) conditions is achieved when carbon nanotubes (CNTs) are used as a hole conductor in methyl ammonium lead bromide (MAPbBr(3)) perovskite solar cells. Time-resolved photoluminescence and impedance spectroscopy investigations suggest that the observed high VOC is a result of the better charge extraction and lower recombination of the CNT hole conductor. Tandem solar cells with all perovskite absorbers are demonstrated with a MAPbBr(3)/CNT top cell and a MAPbI(3) bottom cell, achieving a VOC of 2.24 V in series connection. The semitransparent and high voltage MAPbBr(3)/CNT solar cells show great potential for applications in solar cell windows, tandem solar cells and s...
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