Abstract
Poly(vinylcarbazole) (PVCz) dispersed the typical fullerene derivative, PCBM, well in its solution, which was then coated onto a mesoporous titanium oxide (TiO 2 ) layer. PVCz served as a scaffold to fix PCBM homogeneously and to prevent its elution out upon the following perovskite layer formation. A series of perovskite cells were fabricated upon the PVCz/PCBM-modified TiO 2 layer. Many of the cells were characterized by a photovoltaic conversion efficiency of >20%, and the top cells had an efficiency of 21.1% (with an average of 21.0%). Fluorescence decay from the perovskite layer of the cell was unchanged with the PVCz/PCBM modification, suggesting an efficient charge transport to the electron-transporting layers. On the other hand, the PVCz/PCBM modification or passivation significantly reduced electroluminescence intensity under an inverse bias application, supporting an efficient suppression of carrier recombination at the TiO 2 and perovskite interface.
Original language | English |
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Pages (from-to) | 2848-2853 |
Number of pages | 6 |
Journal | ACS Applied Energy Materials |
Volume | 2 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2019 Apr 22 |
Keywords
- charge transport
- interface passivation
- perovskite
- photoenergy conversion
- poly(vinylcarbazole)
- solar cell
ASJC Scopus subject areas
- Energy Engineering and Power Technology
- Chemical Engineering (miscellaneous)
- Electrochemistry
- Materials Chemistry
- Electrical and Electronic Engineering