am9b20402_si_001.pdf (1.73 MB)
Modifying Mesoporous TiO2 by Ammonium Sulfonate Boosts Performance of Perovskite Solar Cells
journal contribution
posted on 2020-03-05, 14:18 authored by Mengmeng Zhang, Weiran Zhou, Wanpei Hu, Bairu Li, Qiquan Qiao, Shangfeng YangMesoporous-structure
perovskite solar cells (meso-PVKSCs) have been widely utilized due
to the achieved high efficiency for which the TiO2 layer
usually suffers from sufficient electron trap states, low electron
mobility, and inavoidable catalytic activity. Herein, a mesoporous
TiO2 (m-TiO2) layer is modified by tetraethylammonium p-toluenesulfonate (abbreviated as TEATS) for the first
time, leading to a significant photoelectric conversion efficiency
enhancement from 19.14 to 20.69% for Cs0.05MA0.12FA0.83PbI2.55Br0.45 (abbreviated
as CsMAFA) meso-PVKSCs. In particular, the obtained champion open-circuit
voltage (Voc) is 1.18 V, which is a record
high value for meso-PVKSCs with CsMAFA triple cation mixed perovskite.
A series of measurements were employed to investigate the influences
of TEATS modification on the energy band structures of TiO2 as well as the CsMAFA perovskite layer atop, unveiling that TEATS
modification benefits defect passivation of the TiO2 film
along with a decrease in the work function of TiO2. Besides,
TEATS modification helps to improve the wettability of perovskite
precursors on the m-TiO2 substrate, affording improved
film quality of perovskite with enhanced crystallinity and grain size.
Consequently, the trap states existed in the perovskite film can be
passivated, and the interfacial charge recombination is suppressed.
This further benefits the improvement of the ambient stability of
devices.
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champion open-circuit voltageTiO 2 layerTiO 2 filmModifying Mesoporous TiO 2TEATS modification benefits defect passivationPerovskite Solar Cells Mesoporous-structure perovskitem-TiO 2 substratephotoelectric conversion efficiency enhancementAmmonium Sulfonate Boosts Performanceelectron trap statesCsMAFA perovskite layerCs 0.05 MA 0.12 FA 0.83 PbI 2.55 Br 0.45mesoporous TiO 2TiO 2TEATS modificationenergy band structuresmeso-PVKSC
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