Laser & Photonics Reviews
·
2023
·Vol. 17
·期 8
·2300371
·
IF 11
Haotao Li,Shiming Zhou,Shuming Chen
Top-emitting (TE) quantum-dot light-emitting diodes (QLEDs) can exhibit higher light outcoupling efficiency (OCE) compared to bottom-emitting (BE) QLEDs due to the eliminated substrate mode and enhanced microcavity effect. In this study, TE QLEDs with an OCE of over 45% are realized by simultaneously optimizing the thicknesses of both indium-zinc-oxide (IZO) phase tuning layers and IZO top transparent electrodes. To reduce the resistance, the IZO top electrodes are equipped with an auxiliary metal electrode. Consequently, the red QLEDs demonstrate a high external quantum efficiency (EQE) of 38.2%. Furthermore, by applying a scattering layer on the IZO top electrode, the red QLEDs demonstrate record-breaking efficiencies of EQE 44.5%, power efficiency 92.2 lm W −1 , and current efficiency 93.7 cd A −1 . The proposed device architecture and optimization strategy contribute to a new design scheme for the preparation of highly efficient QLEDs for displays and lighting applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2020
·
IF 4.217
Xiao-Dong Qiao,Xin-Yu Ye,Yang-Hong Wu,Li-Jiao Ma,Bing-Xin Lei,Zhen-Fan Sun
Different TiO 2 mesoporous structures, including core-shell spheres (CCSs) and micro-tubes (MTs), are synthesized through adjusting the pH of the solution using TiOSO 4 as titanium source in a hydrothermal route. TiO 2 CSSs with an average diameter of 1.3–3.5 μm exhibit excellent light scattering property and high specific surface area (177.63 m 2 g −1 ). TiO 2 MTs show ultrahigh specific surface area of 276.03 m 2 g −1 . Dye-sensitized solar cell is fabricated using TiO 2 CSSs as the light scattering layer and TiO 2 nanoparticles (NPs) layer as the bottom layer. The efficiency of Cell-NPs + CSSs is up to 9.24% due to the good light scattering effect and excellent dye loading capacity. Furthermore, TiO 2 MTs are introduced to form the NPs/MTs bottom layer. The Cell-NPs/MTs + CSSs achieves an outstanding efficiency of 9.60% due to the further optimized electron transport path.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2019
·
IF 1.901
Fengyan Xie,Guofa Dong,Kechen Wu,Yafeng Li,Mingdeng Wei,Shaowu Du
NH 4 TiOF 3 nanobricks are prepared by a one-step hydrothermal route and then are made into paste. The NH 4 TiOF 3 are in situ topologically transformed into anatase TiO 2 hollow nanobricks via a boric acid treatment process after the paste is screen-printed onto FTO glass as a scattering layer for DSSCs . The cell with scattering layer exhibits a high photovoltaic conversion efficiency of 8.09%, which is 24.8% higher than that of the cell composed of bare nanocrystalline TiO 2 (6.48%). After a series of characterization, the higher specific surface area and the superior light-scattering ability of hierarchical TiO 2 hollow nanobricks are proved to be the main facts for the enhanced efficiency.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Fengyan Xie,Jingjing Wang,Yafeng Li,Jie Dou,Mingdeng Wei
Hierarchical SnO 2 /TiO 2 composite hollow microspheres were synthesized via one-step hydrothermal route by using titanium tetrabutoxide as titanium source and potassium stannate and tripolycyanamide as co-additive, and the samples were characterized by XRD, BET, SEM and TEM measurements. The results denoted that the synthesized microspheres with a diameter of ca 500–1000 nm were assembled by thin nanosheets and possessed a large surface area of 199.3 m 2 g −1 . In addition, EDX and element mapping measurements indicated that a small amount of SnO 2 nanoparticles uniformly distributed among the nanosheets of microspheres. The hierarchical microspheres simultaneously facilitated dye adsorption, light harvesting, and electron transport , giving rise to a high photovoltaic conversion efficiency of 8.70% when applied as scattering layer for dye-sensitized solar cells, which was a 28.1% improvement compared to that of bare nanocrystalline TiO 2 (6.79%, Dyesol) based cell.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 9
·7692-7700
·
IF 2.324
Hu Zhen,Guo Haiyong,Zhao Li,Wu Yadan,Wang Shimin,Wan Li
A double-layer composite film (DLCF) that consists of upconversion composite La(OH) 3 :Er 3+ /Yb 3+ +P25 (UC + P25) as underlayer and large TiO 2 spheres (LS-TiO 2 ) as overlayer is designed as the photoelectrode of dye-sensitized solar cells (DSSCs). The upconversion luminescent material La(OH) 3 :Er 3+ /Yb 3+ can convert near-infrared region to visible light to improve the light absorption, and LS-TiO 2 has been used as light-scattering layer to increase the optical length in the film and enhance light harvesting. The DLCF with lower absorbed dye achieved the highest conversion efficiency due to the synergistic effect of the upconversion luminescent layer and the light-scattering layer, and with an optimum mixing ratio, a conversion efficiency of 9.24% is attained, which is a significant improvement of 68.3% compared with the pure P25 film photoelectrode.
研究领域:
材料科学
·
能源研究
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2017
·Vol. 123
·期 3
·1-9
·
IF 1.455
Guan Yingli,Song Lixin,Zhou Yangyang,Yin Xin,Xie Xueyao,Xiong Jie
Two kinds of TiO 2 microspheres (TMS) with average diameter of 1500 nm but different surface were fabricated by solvothermal method from different Ti source. The effect of TMS on the light harvesting and photovoltaic performance of dye-sensitized solar cells (DSSCs)was investigated. The UV–Vis diffusion reflectance spectra and absorption spectra of N719 dye in detached solutions proved that the TMS showed dual functions of light scattering and dye-adsorption which was an important functional material in DSSCs. The results showed that the TMS made from titanium(IV) isopropoxide with rough surface (TMSR) exhibited better photovoltaic performance than that of TMS made from tetrabutyl titanate with smooth surface (TMSS). To further improve the photovoltaic performance, the double-layered DSSCs made of P25 as an underlayer and TMS as a light-scattering layer (P25-TMS) were fabricated. The photovoltaic performance of double-layered DSSCs was higher than that of the single-layered DSSCs with similar thickness. Especially, the DSSCs made of P25 as an underlayer and the TMSR as a light-scattering layer (P25-TMSR) had a highest power conversion efficiency of 7.62%. This was higher than that of single-layered TMSR-based cell (5.54%), P25-based cell (5.75%), and double-layered P25-TMSS-based cell (6.78%) with similar thickness. This was mainly attributed to the large specific surface area, superior light scattering ability, and fast electron transport of TMSR.
研究领域:
材料科学
·
能源科学
·
纳米技术
·
光电子学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）