Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 4, Pages 2848-2853Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b00162
Keywords
photoenergy conversion; solar cell; perovskite; interface passivation; charge transport; poly(vinylcarbazole)
Funding
- Research and Development of Innovative New Structure Solar Cells from NEDO, Japan
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Poly(vinylcarbazole) (PVCz) dispersed the typical fullerene derivative, PCBM, well in its solution, which was then coated onto a mesoporous titanium oxide (TiO2) 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 TiO2 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 TiO2 and perovskite interface.
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