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科研成果

2020
Guo X, Lv F, Zhao Z, Gu J, Qu B, Xiao L, Chen Z. Spirobifluorene-based oligopyridine derivatives as electron-transporting materials for green phosphorescent organic light-emitting diodes. ORGANIC ELECTRONICS. 2020;77.
Guo X, Lv F, Zhao Z, Gu J, Qu B, Xiao L, Chen Z. Spirobifluorene-based oligopyridine derivatives as electron-transporting materials for green phosphorescent organic light-emitting diodes. ORGANIC ELECTRONICS. 2020;77.Abstract
The electron-transporting materials (ETMs), 2,7-bis(3,5-di (pyridin-3-yl)phenyl)-9,9'-spirobi [fluorene] (3-4PySF) and 2,7-bis(3,5-di (pyridin-4-yl)phenyl)-9,9'-spirobi [fluorene] (4-4PySF) were designed and synthesized by combining spirobifluorene moiety with di(pyridine-3-yl)phenyl and di(pyridine-4-yl)phenyl, respectively. The spimbifluorene moiety improves materials' rigid twisted structure to ensure the morphological stability of amorphous film, and pyridine acts as electron acceptor to enhance electron-transporting ability of materials. The dependence of electron-transporting property on the position of substituted pyridine rings was studied. The melting point (T-m) of 4-4PySF is estimated to be 41 degrees C higher than that of 3-4PySF. And the higher current density in the electron only devices exhibited by 4-4PySF revealed the effect of nitrogen atom position on the charge-transporting properties. Green PhOLEDs based on bis(2-phenylpyridine)iridium (III) (2,2,6,6-tetramethylheptane-3,5-diketonate) (Ir (ppy)(2)tmd) as the emitter and 3-4PySF, 4-4PySF and 1,3,5-tris(N-phenylbenzimid azol-2-yl-benzene (TPBi) as ETMs were fabricated. Compared to the device based on the conventional ETM TPBi, the devices based on new ETMs exhibited a higher maximum external quantum efficiency (EQE) of 20.5% and a lower turn-on voltage (V-on) of 2.6 V.
Wu C, Zhang Q, Liu G, Zhang Z, Wang D, Qu B, Chen Z, Xiao L. From Pb to Bi: A Promising Family of Pb-Free Optoelectronic Materials and Devices. ADVANCED ENERGY MATERIALS. 2020;10.
Xie X, Wu C, Sun S, Xu X, Xu W, Qin G, Xiao L. Semitransparent Perovskite Solar Cells with Dielectric/Metal/Dielectric Top Electrodes. ENERGY TECHNOLOGY. 2020;8.
Xie X, Wu C, Sun S, Xu X, Xu W, Qin G, Xiao L. Semitransparent Perovskite Solar Cells with Dielectric/Metal/Dielectric Top Electrodes. ENERGY TECHNOLOGY. 2020;8.
Wu C, Zhang Q, Liu G, Zhang Z, Wang D, Qu B, Chen Z, Xiao L. From Pb to Bi: A Promising Family of Pb-Free Optoelectronic Materials and Devices. ADVANCED ENERGY MATERIALS. 2020;10.
Wu C, Zhang Q, Liu G, Zhang Z, Wang D, Qu B, Chen Z, Xiao L. From Pb to Bi: A Promising Family of Pb-Free Optoelectronic Materials and Devices. ADVANCED ENERGY MATERIALS. 2020;10.Abstract
Lead-based organic-inorganic hybrid perovskite materials are widely used in optoelectronic devices due to their excellent photophysical properties. However, the main issues which hinder its commercialization are the toxicity caused by lead and the intrinsic instability of the material. Recently, many lead-free halide materials with good intrinsic stability have been reported, among which bismuth-based halide materials have attracted extensive research due to their structure and promising optoelectronic properties. In this review, bismuth-based materials are divided into binary BiX3 (X = I, Br, Cl), ternary A(a)Bi(b)X(a)(+3)(b) (A = Cs, Rb, MA, Ag, etc.), and quaternary A(2)AgBiX(6) (A = Cs, Rb, MA, etc.) according to its elemental composition. The structure and optoelectronic properties of bismuth-based halide materials, which may be helpful for the development of bismuth-based halide materials and lead-free perovskites in the future, are summarized and highlighted.
Xie X, Wu C, Sun S, Xu X, Xu W, Qin G, Xiao L. Semitransparent Perovskite Solar Cells with Dielectric/Metal/Dielectric Top Electrodes. ENERGY TECHNOLOGY. 2020;8.Abstract
A semitransparent perovskite solar cell (PSC) with a dielectric/metal/dielectric (DMD) multilayer film as the top transparent electrode is investigated. Through adjusting the thickness and the deposition rate of Ag and WO3 layers, a transparent electrode with a low sheet resistance of 7 omega sq(-1) and high average visible transmittance (AVT) of 73% in the visible wavelength range of 400-800 nm is obtained. Using the resultant DMD film as the top transparent electrode and different bandgap perovskites of CH3NH3PbI3 (MAPbI(3)), CH(NH2)(2)PbI3 (FAPbI(3)), and FA(0.5)MA(0.38)Cs(0.12)PbI(2.04)Br(0.96) as the optical active layer, a solar cell with a device architecture of ITO/SnO2/perovskite/spiro-OMeTAD/MoO3/Ag/WO3 is fabricated. A series of efficient semitransparent PSCs with high transmittance are achieved.
Zhang Q, Wu C, Xiao L. Bi-based Lead-free Perovskite Solar Cells, in 2020 47TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC). IEEE; 2020:77-78.
2019
Liu Y, Wang J, Zhang L, Liu W, Wu C, Liu C, Wu Z, Xiao L, Chen Z, Wang S. Exciton and bi-exciton mechanisms in amplified spontaneous emission from CsPbBr3 perovskite thin films. OPTICS EXPRESS. 2019;27:29123-29131.
Guo X, Bian M, Lv F, Wang Y, Zhao Z, Bian Z, Qu B, Xiao L, Chen Z. Increasing electron transporting properties and horizontal molecular orientation via meta-position of nitrogen for ``(A)n-D-(A)n'' structured terpyridine electron-transporting material. JOURNAL OF MATERIALS CHEMISTRY C. 2019;7:11581-11587.
Zhang Y, Wu C, Wang D, Zhang Z, Qi X, Zhu N, Liu G, Li X, Hu H, Chen Z, et al. High Efficiency (16.37%) of Cesium Bromide-Passivated All-Inorganic CsPbI2Br Perovskite Solar Cells. SOLAR RRL. 2019;3.
Luo W, Wu C, Wang D, Zhang Z, Qi X, Guo X, Qu B, Xiao L, Chen Z. Dopant-free Spiro-OMeTAD as hole transporting layer for stable and efficient perovskite solar cells. ORGANIC ELECTRONICS. 2019;74:7-12.
Zhang Z, Wu C, Wang D, Liu G, Zhang Q, Luo W, Qi X, Guo X, Zhang Y, Lao Y, et al. Improvement of Cs2AgBiBr6 double perovskite solar cell by rubidium doping. ORGANIC ELECTRONICS. 2019;74:204-210.
Qi X, Liu G, Wang D, Zhu N, Zhang Y, Zhang Z, Wu C, Li X, Luo W, Li Y, et al. Stable power output (PCE > 19%) of planar perovskite solar cells with PbCl2 modification at the interface of SnO2/CH3NH3PbI3. ORGANIC ELECTRONICS. 2019;74:52-58.
Zhu N, Qi X, Zhang Y, Liu G, Wu C, Wang D, Guo X, Luo W, Li X, Hu H, et al. High Efficiency (18.53%) of Flexible Perovskite Solar Cells via the Insertion of Potassium Chloride between SnO2 and CH3NH3PbI3 Layers. ACS APPLIED ENERGY MATERIALS. 2019;2:3676+.
Zhang Q, Wu C, Qi X, Lv F, Zhang Z, Liu Y, Wang S, Qu B, Chen Z, Xiao L. Photovoltage Approaching 0.9 V for Planar Heterojunction Silver Bismuth Iodide Solar Cells with Li-TFSI Additive. ACS APPLIED ENERGY MATERIALS. 2019;2:3651+.
Luo W, Wu C, Wang D, Zhang Y, Zhang Z, Qi X, Zhu N, Guo X, Qu B, Xiao L, et al. Efficient and Stable Perovskite Solar Cell with High Open-Circuit Voltage by Dimensional Interface Modification. ACS APPLIED MATERIALS & INTERFACES. 2019;11:9149-9155.
Wang D, Wu C, Luo W, Guo X, Qi X, Zhang Y, Zhang Z, Zhu N, Qu B, Xiao L, et al. To Greatly Reduce Defects via Photoannealing for High-Quality Perovskite Films. ACS APPLIED MATERIALS & INTERFACES. 2019;11:20943-20948.
Li Y, Qi X, Liu G, Zhang Y, Zhu N, Zhang Q, Guo X, Wang D, Hu H, Chen Z, et al. High performance of low-temperature processed perovskite solar cells based on a polyelectrolyte interfacial layer of PEI. ORGANIC ELECTRONICS. 2019;65:19-25.

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