Browsing by Author "Yan, Po-Ruei"

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Incorporation of quaternary ammonium salts containing different counterions to improve the performance of inverted perovskite solar cells
(2017-02)
Yan, Po-Ruei
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Huang, Wei-Jie
;
Yang, Sheng-Hsiung
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光電工程學系
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Department of Photonics
In this research, three quaternary ammonium salts containing different counterions, including tetrabutylammonium bromide (TBABr), tetrabutylammonium tetrafluoroborate (TBABF(4)), and tetrabutylammonium hexafluorophosphate (TBAPF(6)), were incorporated into [6,6]-phenyl-C-61 butyric acid methyl ester (PCBM) as electron transporting layer (ETL). These salts-doped PCBM films revealed higher electron mobility and Fermi levels compared with the un-doped one. Better charge transfer at the interface between perovskite and salts-doped PCBM was also obtained from PL quenching experiments. Inverted perovskite solar cells with the configuration of ITO/PEDOT:PSS/CH3NH3PbI3/PCBM + salts/Ag were fabricated, and the J(SC) and FF of devices were significantly enhanced using salts-doped PCBM as ETL. The best device based on TBABF(4)-doped PCBM delivered a power conversion efficiency (PCE) up to 13.41%, which was superior to the one with undoped PCBM layer (PCE = 8.77%). (C) 2016 Elsevier B.V. All rights reserved.
Solution-Processed Hybrid Light-Emitting Devices Comprising TiO2 Nanorods and WO3 Layers as Carrier-Transporting Layers
(2016-11-24)
Tsai, Tsung-Yan
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Yan, Po-Ruei
;
Yang, Sheng-Hsiung
;
照明與能源光電研究所
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Institute of Lighting and Energy Photonics
The goal of this research is to prepare inverted light-emitting devices with improved performance by combining titanium dioxide (TiO2) nanorods and tungsten trioxide (WO3) layer. TiO2 nanorods with different lengths were established directly on the fluorine-doped tin oxide (FTO) substrates by the hydrothermal method. The prepared TiO2 nanorods with lengths shorter than 200 nm possess transmittance higher than 80% in the visible range. Inverted light-emitting devices with the configuration of FTO/TiO2 nanorods/ionic PF/MEH-PPV/PEDOT:PSS/WO3/Au were constructed. The best device based on 100-nm-height TiO2 nanorods achieved a max brightness of 4493 cd/m(2) and current efficiency of 0.66 cd/A, revealing much higher performance compared with those using TiO2 compact layer or nanorods with longer lengths as electron-transporting layers.